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<div class="title">Retrieve distances between objects</div> </div>
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Data Structures</h2></td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="a00316.html">hwloc_distances_s</a></td></tr>
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Enumerations</h2></td></tr>
<tr class="memitem:gab1bb10d3adb85b52cdc6fe5a7f74f108"><td class="memItemLeft" align="right" valign="top">enum  </td><td class="memItemRight" valign="bottom"><a class="el" href="a00214.html#gab1bb10d3adb85b52cdc6fe5a7f74f108">hwloc_distances_kind_e</a> { <br />
  <a class="el" href="a00214.html#ggab1bb10d3adb85b52cdc6fe5a7f74f108a90dc38248c8d5392d4dd3e88f391e984">HWLOC_DISTANCES_KIND_FROM_OS</a>
, <a class="el" href="a00214.html#ggab1bb10d3adb85b52cdc6fe5a7f74f108a0148d7f9be833a04f5a55455437c227b">HWLOC_DISTANCES_KIND_FROM_USER</a>
, <a class="el" href="a00214.html#ggab1bb10d3adb85b52cdc6fe5a7f74f108afd6a3503fbc8f7c1a31235373cefc4c6">HWLOC_DISTANCES_KIND_MEANS_LATENCY</a>
, <a class="el" href="a00214.html#ggab1bb10d3adb85b52cdc6fe5a7f74f108a41b19f141a3c0ffe85f9affaca4b0293">HWLOC_DISTANCES_KIND_MEANS_BANDWIDTH</a>
, <br />
  <a class="el" href="a00214.html#ggab1bb10d3adb85b52cdc6fe5a7f74f108aa6cf2b6dfcf148b65952f811814efbe1">HWLOC_DISTANCES_KIND_HETEROGENEOUS_TYPES</a>
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Functions</h2></td></tr>
<tr class="memitem:ga613e6b2a5d0f06626ee8d0c12fa46691"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="a00214.html#ga613e6b2a5d0f06626ee8d0c12fa46691">hwloc_distances_get</a> (<a class="el" href="a00192.html#ga9d1e76ee15a7dee158b786c30b6a6e38">hwloc_topology_t</a> topology, unsigned *nr, struct <a class="el" href="a00316.html">hwloc_distances_s</a> **distances, unsigned long kind, unsigned long flags)</td></tr>
<tr class="separator:ga613e6b2a5d0f06626ee8d0c12fa46691"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga5d1d35eccfcc2ebcef71a10972ce9b03"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="a00214.html#ga5d1d35eccfcc2ebcef71a10972ce9b03">hwloc_distances_get_by_depth</a> (<a class="el" href="a00192.html#ga9d1e76ee15a7dee158b786c30b6a6e38">hwloc_topology_t</a> topology, int depth, unsigned *nr, struct <a class="el" href="a00316.html">hwloc_distances_s</a> **distances, unsigned long kind, unsigned long flags)</td></tr>
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<tr class="memitem:gaaa6bfbc20072a4f4de132eec859067f6"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="a00214.html#gaaa6bfbc20072a4f4de132eec859067f6">hwloc_distances_get_by_type</a> (<a class="el" href="a00192.html#ga9d1e76ee15a7dee158b786c30b6a6e38">hwloc_topology_t</a> topology, <a class="el" href="a00190.html#gacd37bb612667dc437d66bfb175a8dc55">hwloc_obj_type_t</a> type, unsigned *nr, struct <a class="el" href="a00316.html">hwloc_distances_s</a> **distances, unsigned long kind, unsigned long flags)</td></tr>
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<tr class="memitem:gaa6f9697028c589cef0458edef5fe273f"><td class="memItemLeft" align="right" valign="top">const char * </td><td class="memItemRight" valign="bottom"><a class="el" href="a00214.html#gaa6f9697028c589cef0458edef5fe273f">hwloc_distances_get_name</a> (<a class="el" href="a00192.html#ga9d1e76ee15a7dee158b786c30b6a6e38">hwloc_topology_t</a> topology, struct <a class="el" href="a00316.html">hwloc_distances_s</a> *distances)</td></tr>
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<tr class="memitem:ga1dd78c1f9acd54f26aba0e284e97e51d"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="a00214.html#ga1dd78c1f9acd54f26aba0e284e97e51d">hwloc_distances_release</a> (<a class="el" href="a00192.html#ga9d1e76ee15a7dee158b786c30b6a6e38">hwloc_topology_t</a> topology, struct <a class="el" href="a00316.html">hwloc_distances_s</a> *distances)</td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<h2 class="groupheader">Enumeration Type Documentation</h2>
<a id="gab1bb10d3adb85b52cdc6fe5a7f74f108"></a>
<h2 class="memtitle"><span class="permalink"><a href="#gab1bb10d3adb85b52cdc6fe5a7f74f108">◆ </a></span>hwloc_distances_kind_e</h2>
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<td class="memname">enum <a class="el" href="a00214.html#gab1bb10d3adb85b52cdc6fe5a7f74f108">hwloc_distances_kind_e</a></td>
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<p>Kinds of distance matrices. </p>
<p>The <code>kind</code> attribute of struct <a class="el" href="a00316.html" title="Matrix of distances between a set of objects.">hwloc_distances_s</a> is a OR'ed set of kinds.</p>
<p>A kind of format HWLOC_DISTANCES_KIND_FROM_* specifies where the distance information comes from, if known.</p>
<p>A kind of format HWLOC_DISTANCES_KIND_MEANS_* specifies whether values are latencies or bandwidths, if applicable. </p>
<table class="fieldtable">
<tr><th colspan="2">Enumerator</th></tr><tr><td class="fieldname"><a id="ggab1bb10d3adb85b52cdc6fe5a7f74f108a90dc38248c8d5392d4dd3e88f391e984"></a>HWLOC_DISTANCES_KIND_FROM_OS </td><td class="fielddoc"><p>These distances were obtained from the operating system or hardware. </p>
</td></tr>
<tr><td class="fieldname"><a id="ggab1bb10d3adb85b52cdc6fe5a7f74f108a0148d7f9be833a04f5a55455437c227b"></a>HWLOC_DISTANCES_KIND_FROM_USER </td><td class="fielddoc"><p>These distances were provided by the user. </p>
</td></tr>
<tr><td class="fieldname"><a id="ggab1bb10d3adb85b52cdc6fe5a7f74f108afd6a3503fbc8f7c1a31235373cefc4c6"></a>HWLOC_DISTANCES_KIND_MEANS_LATENCY </td><td class="fielddoc"><p>Distance values are similar to latencies between objects. Values are smaller for closer objects, hence minimal on the diagonal of the matrix (distance between an object and itself). It could also be the number of network hops between objects, etc. </p>
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<tr><td class="fieldname"><a id="ggab1bb10d3adb85b52cdc6fe5a7f74f108a41b19f141a3c0ffe85f9affaca4b0293"></a>HWLOC_DISTANCES_KIND_MEANS_BANDWIDTH </td><td class="fielddoc"><p>Distance values are similar to bandwidths between objects. Values are higher for closer objects, hence maximal on the diagonal of the matrix (distance between an object and itself). Such values are currently ignored for distance-based grouping. </p>
</td></tr>
<tr><td class="fieldname"><a id="ggab1bb10d3adb85b52cdc6fe5a7f74f108aa6cf2b6dfcf148b65952f811814efbe1"></a>HWLOC_DISTANCES_KIND_HETEROGENEOUS_TYPES </td><td class="fielddoc"><p>This distances structure covers objects of different types. </p>
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<h2 class="groupheader">Function Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#ga613e6b2a5d0f06626ee8d0c12fa46691">◆ </a></span>hwloc_distances_get()</h2>
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<td class="memname">int hwloc_distances_get </td>
<td>(</td>
<td class="paramtype"><a class="el" href="a00192.html#ga9d1e76ee15a7dee158b786c30b6a6e38">hwloc_topology_t</a> </td>
<td class="paramname"><em>topology</em>, </td>
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<td class="paramtype">unsigned * </td>
<td class="paramname"><em>nr</em>, </td>
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<td class="paramtype">struct <a class="el" href="a00316.html">hwloc_distances_s</a> ** </td>
<td class="paramname"><em>distances</em>, </td>
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<td class="paramtype">unsigned long </td>
<td class="paramname"><em>kind</em>, </td>
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<td class="paramtype">unsigned long </td>
<td class="paramname"><em>flags</em> </td>
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<p>Retrieve distance matrices. </p>
<p>Retrieve distance matrices from the topology into the <code>distances</code> array.</p>
<p><code>flags</code> is currently unused, should be <code>0</code>.</p>
<p><code>kind</code> serves as a filter. If <code>0</code>, all distance matrices are returned. If it contains some HWLOC_DISTANCES_KIND_FROM_*, only distance matrices whose kind matches one of these are returned. If it contains some HWLOC_DISTANCES_KIND_MEANS_*, only distance matrices whose kind matches one of these are returned.</p>
<p>On input, <code>nr</code> points to the number of distance matrices that may be stored in <code>distances</code>. On output, <code>nr</code> points to the number of distance matrices that were actually found, even if some of them couldn't be stored in <code>distances</code>. Distance matrices that couldn't be stored are ignored, but the function still returns success (<code>0</code>). The caller may find out by comparing the value pointed by <code>nr</code> before and after the function call.</p>
<p>Each distance matrix returned in the <code>distances</code> array should be released by the caller using <a class="el" href="a00214.html#ga1dd78c1f9acd54f26aba0e284e97e51d" title="Release a distance matrix structure previously returned by hwloc_distances_get().">hwloc_distances_release()</a>. </p>
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<a id="ga5d1d35eccfcc2ebcef71a10972ce9b03"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga5d1d35eccfcc2ebcef71a10972ce9b03">◆ </a></span>hwloc_distances_get_by_depth()</h2>
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<td class="memname">int hwloc_distances_get_by_depth </td>
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<td class="paramtype"><a class="el" href="a00192.html#ga9d1e76ee15a7dee158b786c30b6a6e38">hwloc_topology_t</a> </td>
<td class="paramname"><em>topology</em>, </td>
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<td class="paramtype">int </td>
<td class="paramname"><em>depth</em>, </td>
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<td class="paramtype">unsigned * </td>
<td class="paramname"><em>nr</em>, </td>
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<td class="paramtype">struct <a class="el" href="a00316.html">hwloc_distances_s</a> ** </td>
<td class="paramname"><em>distances</em>, </td>
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<td class="paramtype">unsigned long </td>
<td class="paramname"><em>kind</em>, </td>
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<td class="paramtype">unsigned long </td>
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<p>Retrieve distance matrices for object at a specific depth in the topology. </p>
<p>Identical to <a class="el" href="a00214.html#ga613e6b2a5d0f06626ee8d0c12fa46691" title="Retrieve distance matrices.">hwloc_distances_get()</a> with the additional <code>depth</code> filter. </p>
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<a id="gaa457f35b8745ca41ec17797c0d7b20f0"></a>
<h2 class="memtitle"><span class="permalink"><a href="#gaa457f35b8745ca41ec17797c0d7b20f0">◆ </a></span>hwloc_distances_get_by_name()</h2>
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<td class="memname">int hwloc_distances_get_by_name </td>
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<td class="paramtype"><a class="el" href="a00192.html#ga9d1e76ee15a7dee158b786c30b6a6e38">hwloc_topology_t</a> </td>
<td class="paramname"><em>topology</em>, </td>
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<td class="paramtype">const char * </td>
<td class="paramname"><em>name</em>, </td>
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<td class="paramtype">unsigned * </td>
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<td class="paramtype">struct <a class="el" href="a00316.html">hwloc_distances_s</a> ** </td>
<td class="paramname"><em>distances</em>, </td>
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<td class="paramtype">unsigned long </td>
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<p>Retrieve a distance matrix with the given name. </p>
<p>Usually only one distances structure may match a given name.</p>
<p>The name of the most common structure is "NUMALatency". </p>
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<h2 class="memtitle"><span class="permalink"><a href="#gaaa6bfbc20072a4f4de132eec859067f6">◆ </a></span>hwloc_distances_get_by_type()</h2>
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<td class="memname">int hwloc_distances_get_by_type </td>
<td>(</td>
<td class="paramtype"><a class="el" href="a00192.html#ga9d1e76ee15a7dee158b786c30b6a6e38">hwloc_topology_t</a> </td>
<td class="paramname"><em>topology</em>, </td>
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<td class="paramtype"><a class="el" href="a00190.html#gacd37bb612667dc437d66bfb175a8dc55">hwloc_obj_type_t</a> </td>
<td class="paramname"><em>type</em>, </td>
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<td class="paramtype">unsigned * </td>
<td class="paramname"><em>nr</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">struct <a class="el" href="a00316.html">hwloc_distances_s</a> ** </td>
<td class="paramname"><em>distances</em>, </td>
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<td class="paramtype">unsigned long </td>
<td class="paramname"><em>kind</em>, </td>
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<td class="paramtype">unsigned long </td>
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<p>Retrieve distance matrices for object of a specific type. </p>
<p>Identical to <a class="el" href="a00214.html#ga613e6b2a5d0f06626ee8d0c12fa46691" title="Retrieve distance matrices.">hwloc_distances_get()</a> with the additional <code>type</code> filter. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#gaa6f9697028c589cef0458edef5fe273f">◆ </a></span>hwloc_distances_get_name()</h2>
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<td class="memname">const char* hwloc_distances_get_name </td>
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<td class="paramtype"><a class="el" href="a00192.html#ga9d1e76ee15a7dee158b786c30b6a6e38">hwloc_topology_t</a> </td>
<td class="paramname"><em>topology</em>, </td>
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<td class="paramtype">struct <a class="el" href="a00316.html">hwloc_distances_s</a> * </td>
<td class="paramname"><em>distances</em> </td>
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<p>Get a description of what a distances structure contains. </p>
<p>For instance "NUMALatency" for hardware-provided NUMA distances (ACPI SLIT), or NULL if unknown. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#ga1dd78c1f9acd54f26aba0e284e97e51d">◆ </a></span>hwloc_distances_release()</h2>
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<td class="memname">void hwloc_distances_release </td>
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<td class="paramtype"><a class="el" href="a00192.html#ga9d1e76ee15a7dee158b786c30b6a6e38">hwloc_topology_t</a> </td>
<td class="paramname"><em>topology</em>, </td>
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<td class="paramtype">struct <a class="el" href="a00316.html">hwloc_distances_s</a> * </td>
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<p>Release a distance matrix structure previously returned by <a class="el" href="a00214.html#ga613e6b2a5d0f06626ee8d0c12fa46691" title="Retrieve distance matrices.">hwloc_distances_get()</a>. </p>
<dl class="section note"><dt>Note</dt><dd>This function is not required if the structure is removed with <a class="el" href="a00216.html#ga80bbf6f0db9af48c61780dd5152664c2" title="Release and remove the given distance matrice from the topology.">hwloc_distances_release_remove()</a>. </dd></dl>
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