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<li class="toctree-l3"><a class="reference internal" href="MPI_Comm_split.3.html">17.2.79. MPI_Comm_split</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Comm_split_type.3.html">17.2.80. MPI_Comm_split_type</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Comm_test_inter.3.html">17.2.81. MPI_Comm_test_inter</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Compare_and_swap.3.html">17.2.82. MPI_Compare_and_swap</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Dims_create.3.html">17.2.83. MPI_Dims_create</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Dist_graph_create.3.html">17.2.84. MPI_Dist_graph_create</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Dist_graph_create_adjacent.3.html">17.2.85. MPI_Dist_graph_create_adjacent</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Dist_graph_neighbors.3.html">17.2.86. MPI_Dist_graph_neighbors</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Dist_graph_neighbors_count.3.html">17.2.87. MPI_Dist_graph_neighbors_count</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Errhandler_create.3.html">17.2.88. MPI_Errhandler_create</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Errhandler_free.3.html">17.2.89. MPI_Errhandler_free</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Errhandler_get.3.html">17.2.90. MPI_Errhandler_get</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Errhandler_set.3.html">17.2.91. MPI_Errhandler_set</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Errors.3.html">17.2.92. MPI Errors</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Error_class.3.html">17.2.93. MPI_Error_class</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Error_string.3.html">17.2.94. MPI_Error_string</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Exscan.3.html">17.2.95. MPI_Exscan</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Exscan_init.3.html">17.2.96. MPI_Exscan_init</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Fetch_and_op.3.html">17.2.97. MPI_Fetch_and_op</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_File_c2f.3.html">17.2.98. MPI_File_c2f</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_File_call_errhandler.3.html">17.2.99. MPI_File_call_errhandler</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_File_close.3.html">17.2.100. MPI_File_close</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_File_create_errhandler.3.html">17.2.101. MPI_File_create_errhandler</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_File_delete.3.html">17.2.102. MPI_File_delete</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_File_f2c.3.html">17.2.103. MPI_File_f2c</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_File_get_amode.3.html">17.2.104. MPI_File_get_amode</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_File_get_atomicity.3.html">17.2.105. MPI_File_get_atomicity</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_File_get_byte_offset.3.html">17.2.106. MPI_File_get_byte_offset</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_File_get_errhandler.3.html">17.2.107. MPI_File_get_errhandler</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_File_get_group.3.html">17.2.108. MPI_File_get_group</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_File_get_info.3.html">17.2.109. MPI_File_get_info</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_File_get_position.3.html">17.2.110. MPI_File_get_position</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_File_get_position_shared.3.html">17.2.111. MPI_File_get_position_shared</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_File_get_size.3.html">17.2.112. MPI_File_get_size</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_File_get_type_extent.3.html">17.2.113. MPI_File_get_type_extent</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_File_get_view.3.html">17.2.114. MPI_File_get_view</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_File_iread.3.html">17.2.115. MPI_File_iread</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_File_iread_all.3.html">17.2.116. MPI_File_iread_all</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_File_iread_at.3.html">17.2.117. MPI_File_iread_at</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_File_iread_at_all.3.html">17.2.118. MPI_File_iread_at_all</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_File_iread_shared.3.html">17.2.119. MPI_File_iread_shared</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_File_iwrite.3.html">17.2.120. MPI_File_iwrite</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_File_iwrite_all.3.html">17.2.121. MPI_File_iwrite_all</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_File_iwrite_at.3.html">17.2.122. MPI_File_iwrite_at</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_File_iwrite_at_all.3.html">17.2.123. MPI_File_iwrite_at_all</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_File_iwrite_shared.3.html">17.2.124. MPI_File_iwrite_shared</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_File_open.3.html">17.2.125. MPI_File_open</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_File_preallocate.3.html">17.2.126. MPI_File_preallocate</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_File_read.3.html">17.2.127. MPI_File_read</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_File_read_all.3.html">17.2.128. MPI_File_read_all</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_File_read_all_begin.3.html">17.2.129. MPI_File_read_all_begin</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_File_read_all_end.3.html">17.2.130. MPI_File_read_all_end</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_File_read_at.3.html">17.2.131. MPI_File_read_at</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_File_read_at_all.3.html">17.2.132. MPI_File_read_at_all</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_File_read_at_all_begin.3.html">17.2.133. MPI_File_read_at_all_begin</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_File_read_at_all_end.3.html">17.2.134. MPI_File_read_at_all_end</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_File_read_ordered.3.html">17.2.135. MPI_File_read_ordered</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_File_read_ordered_begin.3.html">17.2.136. MPI_File_read_ordered_begin</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_File_read_ordered_end.3.html">17.2.137. MPI_File_read_ordered_end</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_File_read_shared.3.html">17.2.138. MPI_File_read_shared</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_File_seek.3.html">17.2.139. MPI_File_seek</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_File_seek_shared.3.html">17.2.140. MPI_File_seek_shared</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_File_set_atomicity.3.html">17.2.141. MPI_File_set_atomicity</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_File_set_errhandler.3.html">17.2.142. MPI_File_set_errhandler</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_File_set_info.3.html">17.2.143. MPI_File_set_info</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_File_set_size.3.html">17.2.144. MPI_File_set_size</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_File_set_view.3.html">17.2.145. MPI_File_set_view</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_File_sync.3.html">17.2.146. MPI_File_sync</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_File_write.3.html">17.2.147. MPI_File_write</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_File_write_all.3.html">17.2.148. MPI_File_write_all</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_File_write_all_begin.3.html">17.2.149. MPI_File_write_all_begin</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_File_write_all_end.3.html">17.2.150. MPI_File_write_all_end</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_File_write_at.3.html">17.2.151. MPI_File_write_at</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_File_write_at_all.3.html">17.2.152. MPI_File_write_at_all</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_File_write_at_all_begin.3.html">17.2.153. MPI_File_write_at_all_begin</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_File_write_at_all_end.3.html">17.2.154. MPI_File_write_at_all_end</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_File_write_ordered.3.html">17.2.155. MPI_File_write_ordered</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_File_write_ordered_begin.3.html">17.2.156. MPI_File_write_ordered_begin</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_File_write_ordered_end.3.html">17.2.157. MPI_File_write_ordered_end</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_File_write_shared.3.html">17.2.158. MPI_File_write_shared</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Finalize.3.html">17.2.159. MPI_Finalize</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Finalized.3.html">17.2.160. MPI_Finalized</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Free_mem.3.html">17.2.161. MPI_Free_mem</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Gather.3.html">17.2.162. MPI_Gather</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Gather_init.3.html">17.2.163. MPI_Gather_init</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Gatherv.3.html">17.2.164. MPI_Gatherv</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Gatherv_init.3.html">17.2.165. MPI_Gatherv_init</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Get.3.html">17.2.166. MPI_Get</a></li>
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<li class="toctree-l3"><a class="reference internal" href="MPI_Get_address.3.html">17.2.168. MPI_Get_address</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Get_count.3.html">17.2.169. MPI_Get_count</a></li>
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<li class="toctree-l3"><a class="reference internal" href="MPI_Get_version.3.html">17.2.174. MPI_Get_version</a></li>
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<li class="toctree-l3"><a class="reference internal" href="MPI_Graph_get.3.html">17.2.176. MPI_Graph_get</a></li>
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<li class="toctree-l3"><a class="reference internal" href="MPI_Group_compare.3.html">17.2.184. MPI_Group_compare</a></li>
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<li class="toctree-l3"><a class="reference internal" href="MPI_Intercomm_create_from_groups.3.html">17.2.235. MPI_Intercomm_create_from_groups</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Intercomm_merge.3.html">17.2.236. MPI_Intercomm_merge</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Iprobe.3.html">17.2.237. MPI_Iprobe</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Irecv.3.html">17.2.238. MPI_Irecv</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Ireduce.3.html">17.2.239. MPI_Ireduce</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Ireduce_scatter.3.html">17.2.240. MPI_Ireduce_scatter</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Ireduce_scatter_block.3.html">17.2.241. MPI_Ireduce_scatter_block</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Irsend.3.html">17.2.242. MPI_Irsend</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Is_thread_main.3.html">17.2.243. MPI_Is_thread_main</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Iscan.3.html">17.2.244. MPI_Iscan</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Iscatter.3.html">17.2.245. MPI_Iscatter</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Iscatterv.3.html">17.2.246. MPI_Iscatterv</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Isend.3.html">17.2.247. MPI_Isend</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Isendrecv.3.html">17.2.248. MPI_Isendrecv</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Isendrecv_replace.3.html">17.2.249. MPI_Isendrecv_replace</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Issend.3.html">17.2.250. MPI_Issend</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Keyval_create.3.html">17.2.251. MPI_Keyval_create</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Keyval_free.3.html">17.2.252. MPI_Keyval_free</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Lookup_name.3.html">17.2.253. MPI_Lookup_name</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Message_c2f.3.html">17.2.254. MPI_Message_c2f</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Message_f2c.3.html">17.2.255. MPI_Message_f2c</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Mprobe.3.html">17.2.256. MPI_Mprobe</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Mrecv.3.html">17.2.257. MPI_Mrecv</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Neighbor_allgather.3.html">17.2.258. MPI_Neighbor_allgather</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Neighbor_allgather_init.3.html">17.2.259. MPI_Neighbor_allgather_init</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Neighbor_allgatherv.3.html">17.2.260. MPI_Neighbor_allgatherv</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Neighbor_allgatherv_init.3.html">17.2.261. MPI_Neighbor_allgatherv_init</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Neighbor_alltoall.3.html">17.2.262. MPI_Neighbor_alltoall</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Neighbor_alltoall_init.3.html">17.2.263. MPI_Neighbor_alltoall_init</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Neighbor_alltoallv.3.html">17.2.264. MPI_Neighbor_alltoallv</a></li>
<li class="toctree-l3 current"><a class="current reference internal" href="#">17.2.265. MPI_Neighbor_alltoallv_init</a><ul>
<li class="toctree-l4"><a class="reference internal" href="#syntax">17.2.265.1. SYNTAX</a></li>
<li class="toctree-l4"><a class="reference internal" href="#input-parameters">17.2.265.2. INPUT PARAMETERS</a></li>
<li class="toctree-l4"><a class="reference internal" href="#output-parameters">17.2.265.3. OUTPUT PARAMETERS</a></li>
<li class="toctree-l4"><a class="reference internal" href="#description">17.2.265.4. DESCRIPTION</a></li>
<li class="toctree-l4"><a class="reference internal" href="#neighbor-ordering">17.2.265.5. NEIGHBOR ORDERING</a></li>
<li class="toctree-l4"><a class="reference internal" href="#notes">17.2.265.6. NOTES</a></li>
<li class="toctree-l4"><a class="reference internal" href="#errors">17.2.265.7. ERRORS</a></li>
</ul>
</li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Neighbor_alltoallw.3.html">17.2.266. MPI_Neighbor_alltoallw</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Neighbor_alltoallw_init.3.html">17.2.267. MPI_Neighbor_alltoallw_init</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Op_c2f.3.html">17.2.268. MPI_Op_c2f</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Op_commutative.3.html">17.2.269. MPI_Op_commutative</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Op_create.3.html">17.2.270. MPI_Op_create</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Op_f2c.3.html">17.2.271. MPI_Op_f2c</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Op_free.3.html">17.2.272. MPI_Op_free</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Open_port.3.html">17.2.273. MPI_Open_port</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Pack.3.html">17.2.274. MPI_Pack</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Pack_external.3.html">17.2.275. MPI_Pack_external</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Pack_external_size.3.html">17.2.276. MPI_Pack_external_size</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Pack_size.3.html">17.2.277. MPI_Pack_size</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Parrived.3.html">17.2.278. MPI_Parrived</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Pcontrol.3.html">17.2.279. MPI_Pcontrol</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Pready.3.html">17.2.280. MPI_Pready</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Pready_list.3.html">17.2.281. MPI_Pready_list</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Pready_range.3.html">17.2.282. MPI_Pready_range</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Precv_init.3.html">17.2.283. MPI_Precv_init</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Probe.3.html">17.2.284. MPI_Probe</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Psend_init.3.html">17.2.285. MPI_Psend_init</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Publish_name.3.html">17.2.286. MPI_Publish_name</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Put.3.html">17.2.287. MPI_Put</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Query_thread.3.html">17.2.288. MPI_Query_thread</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Raccumulate.3.html">17.2.289. MPI_Raccumulate</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Recv.3.html">17.2.290. MPI_Recv</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Recv_init.3.html">17.2.291. MPI_Recv_init</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Reduce.3.html">17.2.292. MPI_Reduce</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Reduce_init.3.html">17.2.293. MPI_Reduce_init</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Reduce_local.3.html">17.2.294. MPI_Reduce_local</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Reduce_scatter.3.html">17.2.295. MPI_Reduce_scatter</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Reduce_scatter_block.3.html">17.2.296. MPI_Reduce_scatter_block</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Reduce_scatter_block_init.3.html">17.2.297. MPI_Reduce_scatter_block_init</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Reduce_scatter_init.3.html">17.2.298. MPI_Reduce_scatter_init</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Register_datarep.3.html">17.2.299. MPI_Register_datarep</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Request_c2f.3.html">17.2.300. MPI_Request_c2f</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Request_f2c.3.html">17.2.301. MPI_Request_f2c</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Request_free.3.html">17.2.302. MPI_Request_free</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Request_get_status.3.html">17.2.303. MPI_Request_get_status</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Rget.3.html">17.2.304. MPI_Rget</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Rget_accumulate.3.html">17.2.305. MPI_Rget_accumulate</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Rput.3.html">17.2.306. MPI_Rput</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Rsend.3.html">17.2.307. MPI_Rsend</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Rsend_init.3.html">17.2.308. MPI_Rsend_init</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Scan.3.html">17.2.309. MPI_Scan</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Scan_init.3.html">17.2.310. MPI_Scan_init</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Scatter.3.html">17.2.311. MPI_Scatter</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Scatter_init.3.html">17.2.312. MPI_Scatter_init</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Scatterv.3.html">17.2.313. MPI_Scatterv</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Scatterv_init.3.html">17.2.314. MPI_Scatterv_init</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Send.3.html">17.2.315. MPI_Send</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Send_init.3.html">17.2.316. MPI_Send_init</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Sendrecv.3.html">17.2.317. MPI_Sendrecv</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Sendrecv_replace.3.html">17.2.318. MPI_Sendrecv_replace</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Session_call_errhandler.3.html">17.2.319. MPI_Session_call_errhandler</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Session_create_errhandler.3.html">17.2.320. MPI_Session_create_errhandler</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Session_f2c.3.html">17.2.321. MPI_Session_f2c</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Session_finalize.3.html">17.2.322. MPI_Session_finalize</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Session_get_errhandler.3.html">17.2.323. MPI_Session_get_errhandler</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Session_get_info.3.html">17.2.324. MPI_Session_get_info</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Session_get_nth_pset.3.html">17.2.325. MPI_Session_get_nth_pset</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Session_get_num_psets.3.html">17.2.326. MPI_Session_get_num_psets</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Session_get_pset_info.3.html">17.2.327. MPI_Session_get_pset_info</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Session_init.3.html">17.2.328. MPI_Session_init</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Session_set_errhandler.3.html">17.2.329. MPI_Session_set_errhandler</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Sizeof.3.html">17.2.330. MPI_Sizeof</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Ssend.3.html">17.2.331. MPI_Ssend</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Ssend_init.3.html">17.2.332. MPI_Ssend_init</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Start.3.html">17.2.333. MPI_Start</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Startall.3.html">17.2.334. MPI_Startall</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Status_c2f.3.html">17.2.335. MPI_Status_c2f</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Status_c2f08.3.html">17.2.336. MPI_Status_c2f08</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Status_f082c.3.html">17.2.337. MPI_Status_f082c</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Status_f082f.3.html">17.2.338. MPI_Status_f082f</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Status_f2c.3.html">17.2.339. MPI_Status_f2c</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Status_f2f08.3.html">17.2.340. MPI_Status_f2f08</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Status_set_cancelled.3.html">17.2.341. MPI_Status_set_cancelled</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Status_set_elements.3.html">17.2.342. MPI_Status_set_elements</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Status_set_elements_x.3.html">17.2.343. MPI_Status_set_elements_x</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_T.3.html">17.2.344. MPI_T</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_T_category_changed.3.html">17.2.345. MPI_T_category_changed</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_T_category_get_categories.3.html">17.2.346. MPI_T_category_get_categories</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_T_category_get_cvars.3.html">17.2.347. MPI_T_category_get_cvars</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_T_category_get_info.3.html">17.2.348. MPI_T_category_get_info</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_T_category_get_num.3.html">17.2.349. MPI_T_category_get_num</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_T_category_get_pvars.3.html">17.2.350. MPI_T_category_get_pvars</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_T_cvar_get_info.3.html">17.2.351. MPI_T_cvar_get_info</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_T_cvar_get_num.3.html">17.2.352. MPI_T_cvar_get_num</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_T_cvar_handle_alloc.3.html">17.2.353. MPI_T_cvar_handle_alloc</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_T_cvar_handle_free.3.html">17.2.354. MPI_T_cvar_handle_free</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_T_cvar_read.3.html">17.2.355. MPI_T_cvar_read</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_T_cvar_write.3.html">17.2.356. MPI_T_cvar_write</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_T_enum_get_info.3.html">17.2.357. MPI_T_enum_get_info</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_T_enum_get_item.3.html">17.2.358. MPI_T_enum_get_item</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_T_finalize.3.html">17.2.359. MPI_T_finalize</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_T_init_thread.3.html">17.2.360. MPI_T_init_thread</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_T_pvar_get_info.3.html">17.2.361. MPI_T_pvar_get_info</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_T_pvar_get_num.3.html">17.2.362. MPI_T_pvar_get_num</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_T_pvar_handle_alloc.3.html">17.2.363. MPI_T_pvar_handle_alloc</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_T_pvar_handle_free.3.html">17.2.364. MPI_T_pvar_handle_free</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_T_pvar_read.3.html">17.2.365. MPI_T_pvar_read</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_T_pvar_readreset.3.html">17.2.366. MPI_T_pvar_readreset</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_T_pvar_reset.3.html">17.2.367. MPI_T_pvar_reset</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_T_pvar_session_create.3.html">17.2.368. MPI_T_pvar_session_create</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_T_pvar_session_free.3.html">17.2.369. MPI_T_pvar_session_free</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_T_pvar_start.3.html">17.2.370. MPI_T_pvar_start</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_T_pvar_stop.3.html">17.2.371. MPI_T_pvar_stop</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_T_pvar_write.3.html">17.2.372. MPI_T_pvar_write</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Test.3.html">17.2.373. MPI_Test</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Test_cancelled.3.html">17.2.374. MPI_Test_cancelled</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Testall.3.html">17.2.375. MPI_Testall</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Testany.3.html">17.2.376. MPI_Testany</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Testsome.3.html">17.2.377. MPI_Testsome</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Topo_test.3.html">17.2.378. MPI_Topo_test</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Type_c2f.3.html">17.2.379. MPI_Type_c2f</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Type_commit.3.html">17.2.380. MPI_Type_commit</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Type_contiguous.3.html">17.2.381. MPI_Type_contiguous</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Type_create_darray.3.html">17.2.382. MPI_Type_create_darray</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Type_create_f90_complex.3.html">17.2.383. MPI_Type_create_f90_complex</a></li>
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<li class="toctree-l3"><a class="reference internal" href="MPI_Type_create_hindexed.3.html">17.2.386. MPI_Type_create_hindexed</a></li>
<li class="toctree-l3"><a class="reference internal" href="MPI_Type_create_hindexed_block.3.html">17.2.387. MPI_Type_create_hindexed_block</a></li>
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<span id="id1"></span><h1><span class="section-number">17.2.265. </span>MPI_Neighbor_alltoallv_init<a class="headerlink" href="#mpi-neighbor-alltoallv-init" title="Permalink to this heading"></a></h1>
<blockquote>
<div></div></blockquote>
<p><a class="reference internal" href="MPI_Neighbor_alltoallv.3.html#mpi-neighbor-alltoallv"><span class="std std-ref">MPI_Neighbor_alltoallv</span></a>, <a class="reference internal" href="MPI_Ineighbor_alltoallv.3.html#mpi-ineighbor-alltoallv"><span class="std std-ref">MPI_Ineighbor_alltoallv</span></a>,
<a class="reference internal" href="#mpi-neighbor-alltoallv-init"><span class="std std-ref">MPI_Neighbor_alltoallv_init</span></a> — All processes send different amounts of
data to, and receive different amounts of data from, all neighbors</p>
<div class="section" id="syntax">
<h2><span class="section-number">17.2.265.1. </span>SYNTAX<a class="headerlink" href="#syntax" title="Permalink to this heading"></a></h2>
<div class="section" id="c-syntax">
<h3><span class="section-number">17.2.265.1.1. </span>C Syntax<a class="headerlink" href="#c-syntax" title="Permalink to this heading"></a></h3>
<div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="cp">#include</span><span class="w"> </span><span class="cpf"><mpi.h></span>
<span class="kt">int</span><span class="w"> </span><span class="n">MPI_Neighbor_alltoallv</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="o">*</span><span class="n">sendbuf</span><span class="p">,</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">sendcounts</span><span class="p">[],</span>
<span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">sdispls</span><span class="p">[],</span><span class="w"> </span><span class="n">MPI_Datatype</span><span class="w"> </span><span class="n">sendtype</span><span class="p">,</span>
<span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="o">*</span><span class="n">recvbuf</span><span class="p">,</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">recvcounts</span><span class="p">[],</span>
<span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">rdispls</span><span class="p">[],</span><span class="w"> </span><span class="n">MPI_Datatype</span><span class="w"> </span><span class="n">recvtype</span><span class="p">,</span><span class="w"> </span><span class="n">MPI_Comm</span><span class="w"> </span><span class="n">comm</span><span class="p">)</span>
<span class="kt">int</span><span class="w"> </span><span class="n">MPI_Ineighbor_alltoallv</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="o">*</span><span class="n">sendbuf</span><span class="p">,</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">sendcounts</span><span class="p">[],</span>
<span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">sdispls</span><span class="p">[],</span><span class="w"> </span><span class="n">MPI_Datatype</span><span class="w"> </span><span class="n">sendtype</span><span class="p">,</span>
<span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="o">*</span><span class="n">recvbuf</span><span class="p">,</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">recvcounts</span><span class="p">[],</span>
<span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">rdispls</span><span class="p">[],</span><span class="w"> </span><span class="n">MPI_Datatype</span><span class="w"> </span><span class="n">recvtype</span><span class="p">,</span><span class="w"> </span><span class="n">MPI_Comm</span><span class="w"> </span><span class="n">comm</span><span class="p">,</span>
<span class="w"> </span><span class="n">MPI_Request</span><span class="w"> </span><span class="o">*</span><span class="n">request</span><span class="p">)</span>
<span class="kt">int</span><span class="w"> </span><span class="n">MPI_Neighbor_alltoallv_init</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="o">*</span><span class="n">sendbuf</span><span class="p">,</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">sendcounts</span><span class="p">[],</span>
<span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">sdispls</span><span class="p">[],</span><span class="w"> </span><span class="n">MPI_Datatype</span><span class="w"> </span><span class="n">sendtype</span><span class="p">,</span>
<span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="o">*</span><span class="n">recvbuf</span><span class="p">,</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">recvcounts</span><span class="p">[],</span>
<span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">rdispls</span><span class="p">[],</span><span class="w"> </span><span class="n">MPI_Datatype</span><span class="w"> </span><span class="n">recvtype</span><span class="p">,</span><span class="w"> </span><span class="n">MPI_Comm</span><span class="w"> </span><span class="n">comm</span><span class="p">,</span>
<span class="w"> </span><span class="n">MPI_Info</span><span class="w"> </span><span class="n">info</span><span class="p">,</span><span class="w"> </span><span class="n">MPI_Request</span><span class="w"> </span><span class="o">*</span><span class="n">request</span><span class="p">)</span>
</pre></div>
</div>
</div>
<div class="section" id="fortran-syntax">
<h3><span class="section-number">17.2.265.1.2. </span>Fortran Syntax<a class="headerlink" href="#fortran-syntax" title="Permalink to this heading"></a></h3>
<div class="highlight-fortran notranslate"><div class="highlight"><pre><span></span><span class="k">USE </span><span class="n">MPI</span>
<span class="c">! or the older form: INCLUDE 'mpif.h'</span>
<span class="n">MPI_NEIGHBOR_ALLTOALLV</span><span class="p">(</span><span class="n">SENDBUF</span><span class="p">,</span><span class="w"> </span><span class="n">SENDCOUNTS</span><span class="p">,</span><span class="w"> </span><span class="n">SDISPLS</span><span class="p">,</span><span class="w"> </span><span class="n">SENDTYPE</span><span class="p">,</span>
<span class="w"> </span><span class="n">RECVBUF</span><span class="p">,</span><span class="w"> </span><span class="n">RECVCOUNTS</span><span class="p">,</span><span class="w"> </span><span class="n">RDISPLS</span><span class="p">,</span><span class="w"> </span><span class="n">RECVTYPE</span><span class="p">,</span><span class="w"> </span><span class="n">COMM</span><span class="p">,</span><span class="w"> </span><span class="n">IERROR</span><span class="p">)</span>
<span class="w"> </span><span class="o"><</span><span class="k">type</span><span class="o">></span><span class="w"> </span><span class="n">SENDBUF</span><span class="p">(</span><span class="o">*</span><span class="p">),</span><span class="w"> </span><span class="n">RECVBUF</span><span class="p">(</span><span class="o">*</span><span class="p">)</span>
<span class="w"> </span><span class="kt">INTEGER </span><span class="n">SENDCOUNTS</span><span class="p">(</span><span class="o">*</span><span class="p">),</span><span class="w"> </span><span class="n">SDISPLS</span><span class="p">(</span><span class="o">*</span><span class="p">),</span><span class="w"> </span><span class="n">SENDTYPE</span>
<span class="w"> </span><span class="kt">INTEGER </span><span class="n">RECVCOUNTS</span><span class="p">(</span><span class="o">*</span><span class="p">),</span><span class="w"> </span><span class="n">RDISPLS</span><span class="p">(</span><span class="o">*</span><span class="p">),</span><span class="w"> </span><span class="n">RECVTYPE</span>
<span class="w"> </span><span class="kt">INTEGER </span><span class="n">COMM</span><span class="p">,</span><span class="w"> </span><span class="n">IERROR</span>
<span class="n">MPI_INEIGHBOR_ALLTOALLV</span><span class="p">(</span><span class="n">SENDBUF</span><span class="p">,</span><span class="w"> </span><span class="n">SENDCOUNTS</span><span class="p">,</span><span class="w"> </span><span class="n">SDISPLS</span><span class="p">,</span><span class="w"> </span><span class="n">SENDTYPE</span><span class="p">,</span>
<span class="w"> </span><span class="n">RECVBUF</span><span class="p">,</span><span class="w"> </span><span class="n">RECVCOUNTS</span><span class="p">,</span><span class="w"> </span><span class="n">RDISPLS</span><span class="p">,</span><span class="w"> </span><span class="n">RECVTYPE</span><span class="p">,</span><span class="w"> </span><span class="n">COMM</span><span class="p">,</span><span class="w"> </span><span class="n">REQUEST</span><span class="p">,</span><span class="w"> </span><span class="n">IERROR</span><span class="p">)</span>
<span class="w"> </span><span class="o"><</span><span class="k">type</span><span class="o">></span><span class="w"> </span><span class="n">SENDBUF</span><span class="p">(</span><span class="o">*</span><span class="p">),</span><span class="w"> </span><span class="n">RECVBUF</span><span class="p">(</span><span class="o">*</span><span class="p">)</span>
<span class="w"> </span><span class="kt">INTEGER </span><span class="n">SENDCOUNTS</span><span class="p">(</span><span class="o">*</span><span class="p">),</span><span class="w"> </span><span class="n">SDISPLS</span><span class="p">(</span><span class="o">*</span><span class="p">),</span><span class="w"> </span><span class="n">SENDTYPE</span>
<span class="w"> </span><span class="kt">INTEGER </span><span class="n">RECVCOUNTS</span><span class="p">(</span><span class="o">*</span><span class="p">),</span><span class="w"> </span><span class="n">RDISPLS</span><span class="p">(</span><span class="o">*</span><span class="p">),</span><span class="w"> </span><span class="n">RECVTYPE</span>
<span class="w"> </span><span class="kt">INTEGER </span><span class="n">COMM</span><span class="p">,</span><span class="w"> </span><span class="n">REQUEST</span><span class="p">,</span><span class="w"> </span><span class="n">IERROR</span>
<span class="n">MPI_NEIGHBOR_ALLTOALLV_INIT</span><span class="p">(</span><span class="n">SENDBUF</span><span class="p">,</span><span class="w"> </span><span class="n">SENDCOUNTS</span><span class="p">,</span><span class="w"> </span><span class="n">SDISPLS</span><span class="p">,</span><span class="w"> </span><span class="n">SENDTYPE</span><span class="p">,</span>
<span class="w"> </span><span class="n">RECVBUF</span><span class="p">,</span><span class="w"> </span><span class="n">RECVCOUNTS</span><span class="p">,</span><span class="w"> </span><span class="n">RDISPLS</span><span class="p">,</span><span class="w"> </span><span class="n">RECVTYPE</span><span class="p">,</span><span class="w"> </span><span class="n">COMM</span><span class="p">,</span><span class="w"> </span><span class="n">INFO</span><span class="p">,</span><span class="w"> </span><span class="n">REQUEST</span><span class="p">,</span><span class="w"> </span><span class="n">IERROR</span><span class="p">)</span>
<span class="w"> </span><span class="o"><</span><span class="k">type</span><span class="o">></span><span class="w"> </span><span class="n">SENDBUF</span><span class="p">(</span><span class="o">*</span><span class="p">),</span><span class="w"> </span><span class="n">RECVBUF</span><span class="p">(</span><span class="o">*</span><span class="p">)</span>
<span class="w"> </span><span class="kt">INTEGER </span><span class="n">SENDCOUNTS</span><span class="p">(</span><span class="o">*</span><span class="p">),</span><span class="w"> </span><span class="n">SDISPLS</span><span class="p">(</span><span class="o">*</span><span class="p">),</span><span class="w"> </span><span class="n">SENDTYPE</span>
<span class="w"> </span><span class="kt">INTEGER </span><span class="n">RECVCOUNTS</span><span class="p">(</span><span class="o">*</span><span class="p">),</span><span class="w"> </span><span class="n">RDISPLS</span><span class="p">(</span><span class="o">*</span><span class="p">),</span><span class="w"> </span><span class="n">RECVTYPE</span>
<span class="w"> </span><span class="kt">INTEGER </span><span class="n">COMM</span><span class="p">,</span><span class="w"> </span><span class="n">INFO</span><span class="p">,</span><span class="w"> </span><span class="n">REQUEST</span><span class="p">,</span><span class="w"> </span><span class="n">IERROR</span>
</pre></div>
</div>
</div>
<div class="section" id="fortran-2008-syntax">
<h3><span class="section-number">17.2.265.1.3. </span>Fortran 2008 Syntax<a class="headerlink" href="#fortran-2008-syntax" title="Permalink to this heading"></a></h3>
<div class="highlight-fortran notranslate"><div class="highlight"><pre><span></span><span class="k">USE </span><span class="n">mpi_f08</span>
<span class="n">MPI_Neighbor_alltoallv</span><span class="p">(</span><span class="n">sendbuf</span><span class="p">,</span><span class="w"> </span><span class="n">sendcounts</span><span class="p">,</span><span class="w"> </span><span class="n">sdispls</span><span class="p">,</span><span class="w"> </span><span class="n">sendtype</span><span class="p">,</span><span class="w"> </span><span class="n">recvbuf</span><span class="p">,</span>
<span class="w"> </span><span class="n">recvcounts</span><span class="p">,</span><span class="w"> </span><span class="n">rdispls</span><span class="p">,</span><span class="w"> </span><span class="n">recvtype</span><span class="p">,</span><span class="w"> </span><span class="n">comm</span><span class="p">,</span><span class="w"> </span><span class="n">ierror</span><span class="p">)</span>
<span class="w"> </span><span class="k">TYPE</span><span class="p">(</span><span class="o">*</span><span class="p">),</span><span class="w"> </span><span class="k">DIMENSION</span><span class="p">(..),</span><span class="w"> </span><span class="k">INTENT</span><span class="p">(</span><span class="n">IN</span><span class="p">)</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">sendbuf</span>
<span class="w"> </span><span class="k">TYPE</span><span class="p">(</span><span class="o">*</span><span class="p">),</span><span class="w"> </span><span class="k">DIMENSION</span><span class="p">(..)</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">recvbuf</span>
<span class="w"> </span><span class="kt">INTEGER</span><span class="p">,</span><span class="w"> </span><span class="k">INTENT</span><span class="p">(</span><span class="n">IN</span><span class="p">)</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">sendcounts</span><span class="p">(</span><span class="o">*</span><span class="p">),</span><span class="w"> </span><span class="n">sdispls</span><span class="p">(</span><span class="o">*</span><span class="p">),</span><span class="w"> </span><span class="n">recvcounts</span><span class="p">(</span><span class="o">*</span><span class="p">),</span>
<span class="w"> </span><span class="n">rdispls</span><span class="p">(</span><span class="o">*</span><span class="p">)</span>
<span class="w"> </span><span class="k">TYPE</span><span class="p">(</span><span class="n">MPI_Datatype</span><span class="p">),</span><span class="w"> </span><span class="k">INTENT</span><span class="p">(</span><span class="n">IN</span><span class="p">)</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">sendtype</span><span class="p">,</span><span class="w"> </span><span class="n">recvtype</span>
<span class="w"> </span><span class="k">TYPE</span><span class="p">(</span><span class="n">MPI_Comm</span><span class="p">),</span><span class="w"> </span><span class="k">INTENT</span><span class="p">(</span><span class="n">IN</span><span class="p">)</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">comm</span>
<span class="w"> </span><span class="kt">INTEGER</span><span class="p">,</span><span class="w"> </span><span class="k">OPTIONAL</span><span class="p">,</span><span class="w"> </span><span class="k">INTENT</span><span class="p">(</span><span class="n">OUT</span><span class="p">)</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">ierror</span>
<span class="n">MPI_Ineighbor_alltoallv</span><span class="p">(</span><span class="n">sendbuf</span><span class="p">,</span><span class="w"> </span><span class="n">sendcounts</span><span class="p">,</span><span class="w"> </span><span class="n">sdispls</span><span class="p">,</span><span class="w"> </span><span class="n">sendtype</span><span class="p">,</span><span class="w"> </span><span class="n">recvbuf</span><span class="p">,</span>
<span class="w"> </span><span class="n">recvcounts</span><span class="p">,</span><span class="w"> </span><span class="n">rdispls</span><span class="p">,</span><span class="w"> </span><span class="n">recvtype</span><span class="p">,</span><span class="w"> </span><span class="n">comm</span><span class="p">,</span><span class="w"> </span><span class="n">request</span><span class="p">,</span><span class="w"> </span><span class="n">ierror</span><span class="p">)</span>
<span class="w"> </span><span class="k">TYPE</span><span class="p">(</span><span class="o">*</span><span class="p">),</span><span class="w"> </span><span class="k">DIMENSION</span><span class="p">(..),</span><span class="w"> </span><span class="k">INTENT</span><span class="p">(</span><span class="n">IN</span><span class="p">),</span><span class="w"> </span><span class="k">ASYNCHRONOUS</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">sendbuf</span>
<span class="w"> </span><span class="k">TYPE</span><span class="p">(</span><span class="o">*</span><span class="p">),</span><span class="w"> </span><span class="k">DIMENSION</span><span class="p">(..),</span><span class="w"> </span><span class="k">ASYNCHRONOUS</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">recvbuf</span>
<span class="w"> </span><span class="kt">INTEGER</span><span class="p">,</span><span class="w"> </span><span class="k">INTENT</span><span class="p">(</span><span class="n">IN</span><span class="p">),</span><span class="w"> </span><span class="k">ASYNCHRONOUS</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">sendcounts</span><span class="p">(</span><span class="o">*</span><span class="p">),</span><span class="w"> </span><span class="n">sdispls</span><span class="p">(</span><span class="o">*</span><span class="p">),</span>
<span class="w"> </span><span class="n">recvcounts</span><span class="p">(</span><span class="o">*</span><span class="p">),</span><span class="w"> </span><span class="n">rdispls</span><span class="p">(</span><span class="o">*</span><span class="p">)</span>
<span class="w"> </span><span class="k">TYPE</span><span class="p">(</span><span class="n">MPI_Datatype</span><span class="p">),</span><span class="w"> </span><span class="k">INTENT</span><span class="p">(</span><span class="n">IN</span><span class="p">)</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">sendtype</span><span class="p">,</span><span class="w"> </span><span class="n">recvtype</span>
<span class="w"> </span><span class="k">TYPE</span><span class="p">(</span><span class="n">MPI_Comm</span><span class="p">),</span><span class="w"> </span><span class="k">INTENT</span><span class="p">(</span><span class="n">IN</span><span class="p">)</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">comm</span>
<span class="w"> </span><span class="k">TYPE</span><span class="p">(</span><span class="n">MPI_Request</span><span class="p">),</span><span class="w"> </span><span class="k">INTENT</span><span class="p">(</span><span class="n">OUT</span><span class="p">)</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">request</span>
<span class="w"> </span><span class="kt">INTEGER</span><span class="p">,</span><span class="w"> </span><span class="k">OPTIONAL</span><span class="p">,</span><span class="w"> </span><span class="k">INTENT</span><span class="p">(</span><span class="n">OUT</span><span class="p">)</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">ierror</span>
<span class="n">MPI_Neighbor_alltoallv_init</span><span class="p">(</span><span class="n">sendbuf</span><span class="p">,</span><span class="w"> </span><span class="n">sendcounts</span><span class="p">,</span><span class="w"> </span><span class="n">sdispls</span><span class="p">,</span><span class="w"> </span><span class="n">sendtype</span><span class="p">,</span><span class="w"> </span><span class="n">recvbuf</span><span class="p">,</span>
<span class="w"> </span><span class="n">recvcounts</span><span class="p">,</span><span class="w"> </span><span class="n">rdispls</span><span class="p">,</span><span class="w"> </span><span class="n">recvtype</span><span class="p">,</span><span class="w"> </span><span class="n">comm</span><span class="p">,</span><span class="w"> </span><span class="n">info</span><span class="p">,</span><span class="w"> </span><span class="n">request</span><span class="p">,</span><span class="w"> </span><span class="n">ierror</span><span class="p">)</span>
<span class="w"> </span><span class="k">TYPE</span><span class="p">(</span><span class="o">*</span><span class="p">),</span><span class="w"> </span><span class="k">DIMENSION</span><span class="p">(..),</span><span class="w"> </span><span class="k">INTENT</span><span class="p">(</span><span class="n">IN</span><span class="p">),</span><span class="w"> </span><span class="k">ASYNCHRONOUS</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">sendbuf</span>
<span class="w"> </span><span class="k">TYPE</span><span class="p">(</span><span class="o">*</span><span class="p">),</span><span class="w"> </span><span class="k">DIMENSION</span><span class="p">(..),</span><span class="w"> </span><span class="k">ASYNCHRONOUS</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">recvbuf</span>
<span class="w"> </span><span class="kt">INTEGER</span><span class="p">,</span><span class="w"> </span><span class="k">INTENT</span><span class="p">(</span><span class="n">IN</span><span class="p">),</span><span class="w"> </span><span class="k">ASYNCHRONOUS</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">sendcounts</span><span class="p">(</span><span class="o">*</span><span class="p">),</span><span class="w"> </span><span class="n">sdispls</span><span class="p">(</span><span class="o">*</span><span class="p">),</span>
<span class="w"> </span><span class="n">recvcounts</span><span class="p">(</span><span class="o">*</span><span class="p">),</span><span class="w"> </span><span class="n">rdispls</span><span class="p">(</span><span class="o">*</span><span class="p">)</span>
<span class="w"> </span><span class="k">TYPE</span><span class="p">(</span><span class="n">MPI_Datatype</span><span class="p">),</span><span class="w"> </span><span class="k">INTENT</span><span class="p">(</span><span class="n">IN</span><span class="p">)</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">sendtype</span><span class="p">,</span><span class="w"> </span><span class="n">recvtype</span>
<span class="w"> </span><span class="k">TYPE</span><span class="p">(</span><span class="n">MPI_Comm</span><span class="p">),</span><span class="w"> </span><span class="k">INTENT</span><span class="p">(</span><span class="n">IN</span><span class="p">)</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">comm</span>
<span class="w"> </span><span class="k">TYPE</span><span class="p">(</span><span class="n">MPI_Info</span><span class="p">),</span><span class="w"> </span><span class="k">INTENT</span><span class="p">(</span><span class="n">IN</span><span class="p">)</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">info</span>
<span class="w"> </span><span class="k">TYPE</span><span class="p">(</span><span class="n">MPI_Request</span><span class="p">),</span><span class="w"> </span><span class="k">INTENT</span><span class="p">(</span><span class="n">OUT</span><span class="p">)</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">request</span>
<span class="w"> </span><span class="kt">INTEGER</span><span class="p">,</span><span class="w"> </span><span class="k">OPTIONAL</span><span class="p">,</span><span class="w"> </span><span class="k">INTENT</span><span class="p">(</span><span class="n">OUT</span><span class="p">)</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">ierror</span>
</pre></div>
</div>
</div>
</div>
<div class="section" id="input-parameters">
<h2><span class="section-number">17.2.265.2. </span>INPUT PARAMETERS<a class="headerlink" href="#input-parameters" title="Permalink to this heading"></a></h2>
<ul class="simple">
<li><p><code class="docutils literal notranslate"><span class="pre">sendbuf</span></code>: Starting address of send buffer.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">sendcounts</span></code>: Integer array, where entry i specifies the number of elements to send to neighbor i.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">sdispls</span></code>: Integer array, where entry i specifies the displacement (offset from <em>sendbuf</em>, in units of <em>sendtype</em>) from which to send data to neighbor i.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">sendtype</span></code>: Datatype of send buffer elements.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">recvcounts</span></code>: Integer array, where entry j specifies the number of elements to receive from neighbor j.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">rdispls</span></code>: Integer array, where entry j specifies the displacement (offset from <em>recvbuf</em>, in units of <em>recvtype</em>) to which data from neighbor j should be written.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">recvtype</span></code>: Datatype of receive buffer elements.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">comm</span></code>: Communicator over which data is to be exchanged.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">info</span></code>: Info (handle, persistent only).</p></li>
</ul>
</div>
<div class="section" id="output-parameters">
<h2><span class="section-number">17.2.265.3. </span>OUTPUT PARAMETERS<a class="headerlink" href="#output-parameters" title="Permalink to this heading"></a></h2>
<ul class="simple">
<li><p><code class="docutils literal notranslate"><span class="pre">recvbuf</span></code>: Address of receive buffer.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">request</span></code>: Request (handle, non-blocking only).</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">ierror</span></code>: Fortran only: Error status.</p></li>
</ul>
</div>
<div class="section" id="description">
<h2><span class="section-number">17.2.265.4. </span>DESCRIPTION<a class="headerlink" href="#description" title="Permalink to this heading"></a></h2>
<p><a class="reference internal" href="MPI_Neighbor_alltoallv.3.html#mpi-neighbor-alltoallv"><span class="std std-ref">MPI_Neighbor_alltoallv</span></a> is a generalized collective operation in which
all processes send data to and receive data from all neighbors. It adds
flexibility to <a class="reference internal" href="MPI_Neighbor_alltoall.3.html#mpi-neighbor-alltoall"><span class="std std-ref">MPI_Neighbor_alltoall</span></a> by allowing the user to specify
data to send and receive vector-style (via a displacement and element
count). The operation of this routine can be thought of as follows,
where each process performs 2n (n being the number of neighbors in to
topology of communicator <em>comm</em>) independent point-to-point
communications. The neighbors and buffer layout are determined by the
topology of <em>comm</em>.</p>
<div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="n">MPI_Cart_get</span><span class="p">(</span><span class="n">comm</span><span class="p">,</span><span class="w"> </span><span class="n">maxdims</span><span class="p">,</span><span class="w"> </span><span class="n">dims</span><span class="p">,</span><span class="w"> </span><span class="n">periods</span><span class="p">,</span><span class="w"> </span><span class="n">coords</span><span class="p">);</span>
<span class="k">for</span><span class="w"> </span><span class="p">(</span><span class="n">dim</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">,</span><span class="w"> </span><span class="n">i</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="w"> </span><span class="p">;</span><span class="w"> </span><span class="n">dim</span><span class="w"> </span><span class="o"><</span><span class="w"> </span><span class="n">dims</span><span class="w"> </span><span class="p">;</span><span class="w"> </span><span class="o">++</span><span class="n">dim</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">MPI_Cart_shift</span><span class="p">(</span><span class="n">comm</span><span class="p">,</span><span class="w"> </span><span class="n">dim</span><span class="p">,</span><span class="w"> </span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="o">&</span><span class="n">r0</span><span class="p">,</span><span class="w"> </span><span class="o">&</span><span class="n">r1</span><span class="p">);</span>
<span class="w"> </span><span class="n">MPI_Isend</span><span class="p">(</span><span class="n">sendbuf</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="n">sdispls</span><span class="p">[</span><span class="n">i</span><span class="p">]</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">extent</span><span class="p">(</span><span class="n">sendtype</span><span class="p">),</span>
<span class="w"> </span><span class="n">sendcount</span><span class="p">,</span><span class="w"> </span><span class="n">sendtype</span><span class="p">,</span><span class="w"> </span><span class="n">r0</span><span class="p">,</span><span class="w"> </span><span class="p">...,</span><span class="w"> </span><span class="n">comm</span><span class="p">,</span><span class="w"> </span><span class="p">...);</span>
<span class="w"> </span><span class="n">MPI_Irecv</span><span class="p">(</span><span class="n">recvbuf</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="n">rdispls</span><span class="p">[</span><span class="n">i</span><span class="p">]</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">extent</span><span class="p">(</span><span class="n">recvtype</span><span class="p">),</span>
<span class="w"> </span><span class="n">recvcount</span><span class="p">,</span><span class="w"> </span><span class="n">recvtype</span><span class="p">,</span><span class="w"> </span><span class="n">r0</span><span class="p">,</span><span class="w"> </span><span class="p">...,</span><span class="w"> </span><span class="n">comm</span><span class="p">,</span><span class="w"> </span><span class="p">...);</span>
<span class="w"> </span><span class="o">++</span><span class="n">i</span><span class="p">;</span>
<span class="w"> </span><span class="n">MPI_Isend</span><span class="p">(</span><span class="n">sendbuf</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="n">sdispls</span><span class="p">[</span><span class="n">i</span><span class="p">]</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">extent</span><span class="p">(</span><span class="n">sendtype</span><span class="p">),</span>
<span class="w"> </span><span class="n">sendcount</span><span class="p">,</span><span class="w"> </span><span class="n">sendtype</span><span class="p">,</span><span class="w"> </span><span class="n">r1</span><span class="p">,</span><span class="w"> </span><span class="p">...,</span><span class="w"> </span><span class="n">comm</span><span class="p">,</span><span class="w"> </span><span class="o">&</span><span class="n">req</span><span class="p">[</span><span class="n">i</span><span class="p">]);</span>
<span class="w"> </span><span class="n">MPI_Irecv</span><span class="p">(</span><span class="n">recvbuf</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="n">rdispls</span><span class="p">[</span><span class="n">i</span><span class="p">]</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">extent</span><span class="p">(</span><span class="n">recvtype</span><span class="p">),</span>
<span class="w"> </span><span class="n">recvcount</span><span class="p">,</span><span class="w"> </span><span class="n">recvtype</span><span class="p">,</span><span class="w"> </span><span class="n">r1</span><span class="p">,</span><span class="w"> </span><span class="p">...,</span><span class="w"> </span><span class="n">comm</span><span class="p">,</span><span class="w"> </span><span class="p">...);</span>
<span class="w"> </span><span class="o">++</span><span class="n">i</span><span class="p">;</span>
<span class="p">}</span>
</pre></div>
</div>
<p>Process j sends the k-th block of its local <em>sendbuf</em> to neighbor k,
which places the data in the j-th block of its local <em>recvbuf</em>.</p>
<p>When a pair of processes exchanges data, each may pass different element
count and datatype arguments so long as the sender specifies the same
amount of data to send (in bytes) as the receiver expects to receive.</p>
<p>Note that process i may send a different amount of data to process j
than it receives from process j. Also, a process may send entirely
different amounts of data to different processes in the communicator.</p>
</div>
<div class="section" id="neighbor-ordering">
<h2><span class="section-number">17.2.265.5. </span>NEIGHBOR ORDERING<a class="headerlink" href="#neighbor-ordering" title="Permalink to this heading"></a></h2>
<p>For a distributed graph topology, created with <a class="reference internal" href="MPI_Dist_graph_create.3.html#mpi-dist-graph-create"><span class="std std-ref">MPI_Dist_graph_create</span></a>,
the sequence of neighbors in the send and receive buffers at each
process is defined as the sequence returned by <a class="reference internal" href="MPI_Dist_graph_neighbors.3.html#mpi-dist-graph-neighbors"><span class="std std-ref">MPI_Dist_graph_neighbors</span></a>
for destinations and sources, respectively. For a general graph
topology, created with <a class="reference internal" href="MPI_Graph_create.3.html#mpi-graph-create"><span class="std std-ref">MPI_Graph_create</span></a>, the order of neighbors in the
send and receive buffers is defined as the sequence of neighbors as
returned by <a class="reference internal" href="MPI_Graph_neighbors.3.html#mpi-graph-neighbors"><span class="std std-ref">MPI_Graph_neighbors</span></a>. Note that general graph topologies
should generally be replaced by the distributed graph topologies.</p>
<p>For a Cartesian topology, created with <a class="reference internal" href="MPI_Cart_create.3.html#mpi-cart-create"><span class="std std-ref">MPI_Cart_create</span></a>, the sequence of
neighbors in the send and receive buffers at each process is defined by
order of the dimensions, first the neighbor in the negative direction
and then in the positive direction with displacement 1. The numbers of
sources and destinations in the communication routines are 2*ndims with
ndims defined in <a class="reference internal" href="MPI_Cart_create.3.html#mpi-cart-create"><span class="std std-ref">MPI_Cart_create</span></a>. If a neighbor does not exist, i.e., at
the border of a Cartesian topology in the case of a non-periodic virtual
grid dimension (i.e., periods[…]==false), then this neighbor is
defined to be <code class="docutils literal notranslate"><span class="pre">MPI_PROC_NULL</span></code>.</p>
<p>If a neighbor in any of the functions is <code class="docutils literal notranslate"><span class="pre">MPI_PROC_NULL</span></code>, then the
neighborhood collective communication behaves like a point-to-point
communication with <code class="docutils literal notranslate"><span class="pre">MPI_PROC_NULL</span></code> in this direction. That is, the buffer
is still part of the sequence of neighbors but it is neither
communicated nor updated.</p>
</div>
<div class="section" id="notes">
<h2><span class="section-number">17.2.265.6. </span>NOTES<a class="headerlink" href="#notes" title="Permalink to this heading"></a></h2>
<p>The MPI_IN_PLACE option for <em>sendbuf</em> is not meaningful for this
operation.</p>
<p>The specification of counts and displacements should not cause any
location to be written more than once.</p>
<p>All arguments on all processes are significant. The <em>comm</em> argument, in
particular, must describe the same communicator on all processes.</p>
<p>The offsets of <em>sdispls</em> and <em>rdispls</em> are measured in units of
<em>sendtype</em> and <em>recvtype</em>, respectively. Compare this to
<a class="reference internal" href="MPI_Neighbor_alltoallw.3.html#mpi-neighbor-alltoallw"><span class="std std-ref">MPI_Neighbor_alltoallw</span></a>, where these offsets are measured in bytes.</p>
</div>
<div class="section" id="errors">
<h2><span class="section-number">17.2.265.7. </span>ERRORS<a class="headerlink" href="#errors" title="Permalink to this heading"></a></h2>
<p>Almost all MPI routines return an error value; C routines as the return result
of the function and Fortran routines in the last argument.</p>
<p>Before the error value is returned, the current MPI error handler associated
with the communication object (e.g., communicator, window, file) is called.
If no communication object is associated with the MPI call, then the call is
considered attached to MPI_COMM_SELF and will call the associated MPI error
handler. When MPI_COMM_SELF is not initialized (i.e., before
<a class="reference internal" href="MPI_Init.3.html#mpi-init"><span class="std std-ref">MPI_Init</span></a>/<a class="reference internal" href="MPI_Init_thread.3.html#mpi-init-thread"><span class="std std-ref">MPI_Init_thread</span></a>, after <a class="reference internal" href="MPI_Finalize.3.html#mpi-finalize"><span class="std std-ref">MPI_Finalize</span></a>, or when using the Sessions
Model exclusively) the error raises the initial error handler. The initial
error handler can be changed by calling <a class="reference internal" href="MPI_Comm_set_errhandler.3.html#mpi-comm-set-errhandler"><span class="std std-ref">MPI_Comm_set_errhandler</span></a> on
MPI_COMM_SELF when using the World model, or the mpi_initial_errhandler CLI
argument to mpiexec or info key to <a class="reference internal" href="MPI_Comm_spawn.3.html#mpi-comm-spawn"><span class="std std-ref">MPI_Comm_spawn</span></a>/<a class="reference internal" href="MPI_Comm_spawn_multiple.3.html#mpi-comm-spawn-multiple"><span class="std std-ref">MPI_Comm_spawn_multiple</span></a>.
If no other appropriate error handler has been set, then the MPI_ERRORS_RETURN
error handler is called for MPI I/O functions and the MPI_ERRORS_ABORT error
handler is called for all other MPI functions.</p>
<p>Open MPI includes three predefined error handlers that can be used:</p>
<ul class="simple">
<li><p><code class="docutils literal notranslate"><span class="pre">MPI_ERRORS_ARE_FATAL</span></code>
Causes the program to abort all connected MPI processes.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">MPI_ERRORS_ABORT</span></code>
An error handler that can be invoked on a communicator,
window, file, or session. When called on a communicator, it
acts as if <a class="reference internal" href="MPI_Abort.3.html#mpi-abort"><span class="std std-ref">MPI_Abort</span></a> was called on that communicator. If
called on a window or file, acts as if <a class="reference internal" href="MPI_Abort.3.html#mpi-abort"><span class="std std-ref">MPI_Abort</span></a> was called
on a communicator containing the group of processes in the
corresponding window or file. If called on a session,
aborts only the local process.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">MPI_ERRORS_RETURN</span></code>
Returns an error code to the application.</p></li>
</ul>
<p>MPI applications can also implement their own error handlers by calling:</p>
<ul class="simple">
<li><p><a class="reference internal" href="MPI_Comm_create_errhandler.3.html#mpi-comm-create-errhandler"><span class="std std-ref">MPI_Comm_create_errhandler</span></a> then <a class="reference internal" href="MPI_Comm_set_errhandler.3.html#mpi-comm-set-errhandler"><span class="std std-ref">MPI_Comm_set_errhandler</span></a></p></li>
<li><p><a class="reference internal" href="MPI_File_create_errhandler.3.html#mpi-file-create-errhandler"><span class="std std-ref">MPI_File_create_errhandler</span></a> then <a class="reference internal" href="MPI_File_set_errhandler.3.html#mpi-file-set-errhandler"><span class="std std-ref">MPI_File_set_errhandler</span></a></p></li>
<li><p><a class="reference internal" href="MPI_Session_create_errhandler.3.html#mpi-session-create-errhandler"><span class="std std-ref">MPI_Session_create_errhandler</span></a> then <a class="reference internal" href="MPI_Session_set_errhandler.3.html#mpi-session-set-errhandler"><span class="std std-ref">MPI_Session_set_errhandler</span></a> or at <a class="reference internal" href="MPI_Session_init.3.html#mpi-session-init"><span class="std std-ref">MPI_Session_init</span></a></p></li>
<li><p><a class="reference internal" href="MPI_Win_create_errhandler.3.html#mpi-win-create-errhandler"><span class="std std-ref">MPI_Win_create_errhandler</span></a> then <a class="reference internal" href="MPI_Win_set_errhandler.3.html#mpi-win-set-errhandler"><span class="std std-ref">MPI_Win_set_errhandler</span></a></p></li>
</ul>
<p>Note that MPI does not guarantee that an MPI program can continue past
an error.</p>
<p>See the <a class="reference internal" href="../man7/Open-MPI.7.html#open-mpi"><span class="std std-ref">MPI man page</span></a> for a full list of <a class="reference internal" href="MPI_Errors.3.html#open-mpi-errors"><span class="std std-ref">MPI error codes</span></a>.</p>
<p>See the Error Handling section of the MPI-3.1 standard for
more information.</p>
<div class="admonition seealso">
<p class="admonition-title">See also</p>
<ul class="simple">
<li><p><a class="reference internal" href="MPI_Neighbor_alltoall.3.html#mpi-neighbor-alltoall"><span class="std std-ref">MPI_Neighbor_alltoall</span></a></p></li>
<li><p><a class="reference internal" href="MPI_Neighbor_alltoallw.3.html#mpi-neighbor-alltoallw"><span class="std std-ref">MPI_Neighbor_alltoallw</span></a></p></li>
<li><p><a class="reference internal" href="MPI_Cart_create.3.html#mpi-cart-create"><span class="std std-ref">MPI_Cart_create</span></a></p></li>
<li><p><a class="reference internal" href="MPI_Graph_create.3.html#mpi-graph-create"><span class="std std-ref">MPI_Graph_create</span></a></p></li>
<li><p><a class="reference internal" href="MPI_Dist_graph_create.3.html#mpi-dist-graph-create"><span class="std std-ref">MPI_Dist_graph_create</span></a></p></li>
</ul>
</div>
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