1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
|
<!DOCTYPE html>
<html class="writer-html5" lang="en">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>18.2.96. shmem_int_max_to_all — Open MPI 5.0.8 documentation</title>
<link rel="stylesheet" type="text/css" href="../../_static/pygments.css" />
<link rel="stylesheet" type="text/css" href="../../_static/css/theme.css" />
<!--[if lt IE 9]>
<script src="../../_static/js/html5shiv.min.js"></script>
<![endif]-->
<script data-url_root="../../" id="documentation_options" src="../../_static/documentation_options.js"></script>
<script src="../../_static/jquery.js"></script>
<script src="../../_static/underscore.js"></script>
<script src="../../_static/_sphinx_javascript_frameworks_compat.js"></script>
<script src="../../_static/doctools.js"></script>
<script src="../../_static/sphinx_highlight.js"></script>
<script src="../../_static/js/theme.js"></script>
<link rel="index" title="Index" href="../../genindex.html" />
<link rel="search" title="Search" href="../../search.html" />
<link rel="next" title="18.2.97. shmem_int_min_to_all" href="shmem_int_min_to_all.3.html" />
<link rel="prev" title="18.2.95. shmem_int_iput" href="shmem_int_iput.3.html" />
</head>
<body class="wy-body-for-nav">
<div class="wy-grid-for-nav">
<nav data-toggle="wy-nav-shift" class="wy-nav-side">
<div class="wy-side-scroll">
<div class="wy-side-nav-search" >
<a href="../../index.html" class="icon icon-home">
Open MPI
</a>
<div role="search">
<form id="rtd-search-form" class="wy-form" action="../../search.html" method="get">
<input type="text" name="q" placeholder="Search docs" aria-label="Search docs" />
<input type="hidden" name="check_keywords" value="yes" />
<input type="hidden" name="area" value="default" />
</form>
</div>
</div><div class="wy-menu wy-menu-vertical" data-spy="affix" role="navigation" aria-label="Navigation menu">
<ul class="current">
<li class="toctree-l1"><a class="reference internal" href="../../quickstart.html">1. Quick start</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../getting-help.html">2. Getting help</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../release-notes/index.html">3. Release notes</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../installing-open-mpi/index.html">4. Building and installing Open MPI</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../features/index.html">5. Open MPI-specific features</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../validate.html">6. Validating your installation</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../version-numbering.html">7. Version numbers and compatibility</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../mca.html">8. The Modular Component Architecture (MCA)</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../building-apps/index.html">9. Building MPI applications</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../launching-apps/index.html">10. Launching MPI applications</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../tuning-apps/index.html">11. Run-time operation and tuning MPI applications</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../app-debug/index.html">12. Debugging Open MPI Parallel Applications</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../developers/index.html">13. Developer’s guide</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../contributing.html">14. Contributing to Open MPI</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../license/index.html">15. License</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../history.html">16. History of Open MPI</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../man-openmpi/index.html">17. Open MPI manual pages</a></li>
<li class="toctree-l1 current"><a class="reference internal" href="../index.html">18. OpenSHMEM manual pages</a><ul class="current">
<li class="toctree-l2"><a class="reference internal" href="../man1/index.html">18.1. Commands (section 1)</a></li>
<li class="toctree-l2 current"><a class="reference internal" href="index.html">18.2. OpenSHMEM API manual pages (section 3)</a><ul class="current">
<li class="toctree-l3"><a class="reference internal" href="OpenSHMEM.3.html">18.2.1. OpenSHMEM</a></li>
<li class="toctree-l3"><a class="reference internal" href="_my_pe.3.html">18.2.2. _my_pe</a></li>
<li class="toctree-l3"><a class="reference internal" href="_num_pes.3.html">18.2.3. _num_pes</a></li>
<li class="toctree-l3"><a class="reference internal" href="intro_shmem.3.html">18.2.4. intro_shmem</a></li>
<li class="toctree-l3"><a class="reference internal" href="shfree.3.html">18.2.5. shfree</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmalloc.3.html">18.2.6. shmalloc</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_addr_accessible.3.html">18.2.7. shmem_addr_accessible</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_align.3.html">18.2.8. shmem_align</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_alltoall32.3.html">18.2.9. shmem_alltoall32</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_alltoall64.3.html">18.2.10. shmem_alltoall64</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_alltoalls32.3.html">18.2.11. shmem_alltoalls32</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_alltoalls64.3.html">18.2.12. shmem_alltoalls64</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_barrier.3.html">18.2.13. shmem_barrier</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_barrier_all.3.html">18.2.14. shmem_barrier_all</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_broadcast32.3.html">18.2.15. shmem_broadcast32</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_broadcast64.3.html">18.2.16. shmem_broadcast64</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_char_g.3.html">18.2.17. shmem_char_g</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_char_get.3.html">18.2.18. shmem_char_get</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_char_get_nbi.3.html">18.2.19. shmem_char_get_nbi</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_char_p.3.html">18.2.20. shmem_char_p</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_char_put.3.html">18.2.21. shmem_char_put</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_char_put_nbi.3.html">18.2.22. shmem_char_put_nbi</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_clear_cache_inv.3.html">18.2.23. shmem_clear_cache_inv</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_clear_cache_line_inv.3.html">18.2.24. shmem_clear_cache_line_inv</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_clear_lock.3.html">18.2.25. shmem_clear_lock</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_collect32.3.html">18.2.26. shmem_collect32</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_collect64.3.html">18.2.27. shmem_collect64</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_complexd_prod_to_all.3.html">18.2.28. shmem_complexd_prod_to_all</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_complexd_sum_to_all.3.html">18.2.29. shmem_complexd_sum_to_all</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_complexf_prod_to_all.3.html">18.2.30. shmem_complexf_prod_to_all</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_complexf_sum_to_all.3.html">18.2.31. shmem_complexf_sum_to_all</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_double_fetch.3.html">18.2.32. shmem_double_fetch</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_double_g.3.html">18.2.33. shmem_double_g</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_double_get.3.html">18.2.34. shmem_double_get</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_double_get_nbi.3.html">18.2.35. shmem_double_get_nbi</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_double_iget.3.html">18.2.36. shmem_double_iget</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_double_iput.3.html">18.2.37. shmem_double_iput</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_double_max_to_all.3.html">18.2.38. shmem_double_max_to_all</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_double_min_to_all.3.html">18.2.39. shmem_double_min_to_all</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_double_p.3.html">18.2.40. shmem_double_p</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_double_prod_to_all.3.html">18.2.41. shmem_double_prod_to_all</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_double_put.3.html">18.2.42. shmem_double_put</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_double_put_nbi.3.html">18.2.43. shmem_double_put_nbi</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_double_set.3.html">18.2.44. shmem_double_set</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_double_sum_to_all.3.html">18.2.45. shmem_double_sum_to_all</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_double_swap.3.html">18.2.46. shmem_double_swap</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_fcollect32.3.html">18.2.47. shmem_fcollect32</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_fcollect64.3.html">18.2.48. shmem_fcollect64</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_fence.3.html">18.2.49. shmem_fence</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_finalize.3.html">18.2.50. shmem_finalize</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_float_fetch.3.html">18.2.51. shmem_float_fetch</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_float_g.3.html">18.2.52. shmem_float_g</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_float_get.3.html">18.2.53. shmem_float_get</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_float_get_nbi.3.html">18.2.54. shmem_float_get_nbi</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_float_iget.3.html">18.2.55. shmem_float_iget</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_float_iput.3.html">18.2.56. shmem_float_iput</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_float_max_to_all.3.html">18.2.57. shmem_float_max_to_all</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_float_min_to_all.3.html">18.2.58. shmem_float_min_to_all</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_float_p.3.html">18.2.59. shmem_float_p</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_float_prod_to_all.3.html">18.2.60. shmem_float_prod_to_all</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_float_put.3.html">18.2.61. shmem_float_put</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_float_put_nbi.3.html">18.2.62. shmem_float_put_nbi</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_float_set.3.html">18.2.63. shmem_float_set</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_float_sum_to_all.3.html">18.2.64. shmem_float_sum_to_all</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_float_swap.3.html">18.2.65. shmem_float_swap</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_free.3.html">18.2.66. shmem_free</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_get128.3.html">18.2.67. shmem_get128</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_get128_nbi.3.html">18.2.68. shmem_get128_nbi</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_get16_nbi.3.html">18.2.69. shmem_get16_nbi</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_get32.3.html">18.2.70. shmem_get32</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_get32_nbi.3.html">18.2.71. shmem_get32_nbi</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_get64.3.html">18.2.72. shmem_get64</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_get64_nbi.3.html">18.2.73. shmem_get64_nbi</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_get8_nbi.3.html">18.2.74. shmem_get8_nbi</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_getmem.3.html">18.2.75. shmem_getmem</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_getmem_nbi.3.html">18.2.76. shmem_getmem_nbi</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_global_exit.3.html">18.2.77. shmem_global_exit</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_iget128.3.html">18.2.78. shmem_iget128</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_iget32.3.html">18.2.79. shmem_iget32</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_iget64.3.html">18.2.80. shmem_iget64</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_info_get_name.3.html">18.2.81. shmem_info_get_name</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_info_get_version.3.html">18.2.82. shmem_info_get_version</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_init.3.html">18.2.83. shmem_init</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_int_add.3.html">18.2.84. shmem_int_add</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_int_and_to_all.3.html">18.2.85. shmem_int_and_to_all</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_int_cswap.3.html">18.2.86. shmem_int_cswap</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_int_fadd.3.html">18.2.87. shmem_int_fadd</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_int_fetch.3.html">18.2.88. shmem_int_fetch</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_int_finc.3.html">18.2.89. shmem_int_finc</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_int_g.3.html">18.2.90. shmem_int_g</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_int_get.3.html">18.2.91. shmem_int_get</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_int_get_nbi.3.html">18.2.92. shmem_int_get_nbi</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_int_iget.3.html">18.2.93. shmem_int_iget</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_int_inc.3.html">18.2.94. shmem_int_inc</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_int_iput.3.html">18.2.95. shmem_int_iput</a></li>
<li class="toctree-l3 current"><a class="current reference internal" href="#">18.2.96. shmem_int_max_to_all</a><ul>
<li class="toctree-l4"><a class="reference internal" href="#synopsis">18.2.96.1. SYNOPSIS</a></li>
<li class="toctree-l4"><a class="reference internal" href="#description">18.2.96.2. DESCRIPTION</a></li>
<li class="toctree-l4"><a class="reference internal" href="#notes">18.2.96.3. NOTES</a></li>
<li class="toctree-l4"><a class="reference internal" href="#examples">18.2.96.4. EXAMPLES</a></li>
</ul>
</li>
<li class="toctree-l3"><a class="reference internal" href="shmem_int_min_to_all.3.html">18.2.97. shmem_int_min_to_all</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_int_or_to_all.3.html">18.2.98. shmem_int_or_to_all</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_int_p.3.html">18.2.99. shmem_int_p</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_int_prod_to_all.3.html">18.2.100. shmem_int_prod_to_all</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_int_put.3.html">18.2.101. shmem_int_put</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_int_put_nbi.3.html">18.2.102. shmem_int_put_nbi</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_int_set.3.html">18.2.103. shmem_int_set</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_int_sum_to_all.3.html">18.2.104. shmem_int_sum_to_all</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_int_swap.3.html">18.2.105. shmem_int_swap</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_int_wait.3.html">18.2.106. shmem_int_wait</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_int_wait_until.3.html">18.2.107. shmem_int_wait_until</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_int_xor_to_all.3.html">18.2.108. shmem_int_xor_to_all</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_iput128.3.html">18.2.109. shmem_iput128</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_iput32.3.html">18.2.110. shmem_iput32</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_iput64.3.html">18.2.111. shmem_iput64</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_long_add.3.html">18.2.112. shmem_long_add</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_long_and_to_all.3.html">18.2.113. shmem_long_and_to_all</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_long_cswap.3.html">18.2.114. shmem_long_cswap</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_long_fadd.3.html">18.2.115. shmem_long_fadd</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_long_fetch.3.html">18.2.116. shmem_long_fetch</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_long_finc.3.html">18.2.117. shmem_long_finc</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_long_g.3.html">18.2.118. shmem_long_g</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_long_get.3.html">18.2.119. shmem_long_get</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_long_get_nbi.3.html">18.2.120. shmem_long_get_nbi</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_long_iget.3.html">18.2.121. shmem_long_iget</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_long_inc.3.html">18.2.122. shmem_long_inc</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_long_iput.3.html">18.2.123. shmem_long_iput</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_long_max_to_all.3.html">18.2.124. shmem_long_max_to_all</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_long_min_to_all.3.html">18.2.125. shmem_long_min_to_all</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_long_or_to_all.3.html">18.2.126. shmem_long_or_to_all</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_long_p.3.html">18.2.127. shmem_long_p</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_long_prod_to_all.3.html">18.2.128. shmem_long_prod_to_all</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_long_put.3.html">18.2.129. shmem_long_put</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_long_put_nbi.3.html">18.2.130. shmem_long_put_nbi</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_long_set.3.html">18.2.131. shmem_long_set</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_long_sum_to_all.3.html">18.2.132. shmem_long_sum_to_all</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_long_swap.3.html">18.2.133. shmem_long_swap</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_long_wait.3.html">18.2.134. shmem_long_wait</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_long_wait_until.3.html">18.2.135. shmem_long_wait_until</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_long_xor_to_all.3.html">18.2.136. shmem_long_xor_to_all</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_longdouble_g.3.html">18.2.137. shmem_longdouble_g</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_longdouble_get.3.html">18.2.138. shmem_longdouble_get</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_longdouble_get_nbi.3.html">18.2.139. shmem_longdouble_get_nbi</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_longdouble_iget.3.html">18.2.140. shmem_longdouble_iget</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_longdouble_iput.3.html">18.2.141. shmem_longdouble_iput</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_longdouble_max_to_all.3.html">18.2.142. shmem_longdouble_max_to_all</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_longdouble_min_to_all.3.html">18.2.143. shmem_longdouble_min_to_all</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_longdouble_p.3.html">18.2.144. shmem_longdouble_p</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_longdouble_prod_to_all.3.html">18.2.145. shmem_longdouble_prod_to_all</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_longdouble_put.3.html">18.2.146. shmem_longdouble_put</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_longdouble_put_nbi.3.html">18.2.147. shmem_longdouble_put_nbi</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_longdouble_sum_to_all.3.html">18.2.148. shmem_longdouble_sum_to_all</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_longlong_add.3.html">18.2.149. shmem_longlong_add</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_longlong_and_to_all.3.html">18.2.150. shmem_longlong_and_to_all</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_longlong_cswap.3.html">18.2.151. shmem_longlong_cswap</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_longlong_fadd.3.html">18.2.152. shmem_longlong_fadd</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_longlong_fetch.3.html">18.2.153. shmem_longlong_fetch</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_longlong_finc.3.html">18.2.154. shmem_longlong_finc</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_longlong_g.3.html">18.2.155. shmem_longlong_g</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_longlong_get.3.html">18.2.156. shmem_longlong_get</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_longlong_get_nbi.3.html">18.2.157. shmem_longlong_get_nbi</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_longlong_iget.3.html">18.2.158. shmem_longlong_iget</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_longlong_inc.3.html">18.2.159. shmem_longlong_inc</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_longlong_iput.3.html">18.2.160. shmem_longlong_iput</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_longlong_max_to_all.3.html">18.2.161. shmem_longlong_max_to_all</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_longlong_min_to_all.3.html">18.2.162. shmem_longlong_min_to_all</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_longlong_or_to_all.3.html">18.2.163. shmem_longlong_or_to_all</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_longlong_p.3.html">18.2.164. shmem_longlong_p</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_longlong_prod_to_all.3.html">18.2.165. shmem_longlong_prod_to_all</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_longlong_put.3.html">18.2.166. shmem_longlong_put</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_longlong_put_nbi.3.html">18.2.167. shmem_longlong_put_nbi</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_longlong_set.3.html">18.2.168. shmem_longlong_set</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_longlong_sum_to_all.3.html">18.2.169. shmem_longlong_sum_to_all</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_longlong_swap.3.html">18.2.170. shmem_longlong_swap</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_longlong_wait.3.html">18.2.171. shmem_longlong_wait</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_longlong_wait_until.3.html">18.2.172. shmem_longlong_wait_until</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_longlong_xor_to_all.3.html">18.2.173. shmem_longlong_xor_to_all</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_malloc.3.html">18.2.174. shmem_malloc</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_my_pe.3.html">18.2.175. shmem_my_pe</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_n_pes.3.html">18.2.176. shmem_n_pes</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_pe_accessible.3.html">18.2.177. shmem_pe_accessible</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_ptr.3.html">18.2.178. shmem_ptr</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_put128.3.html">18.2.179. shmem_put128</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_put128_nbi.3.html">18.2.180. shmem_put128_nbi</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_put16_nbi.3.html">18.2.181. shmem_put16_nbi</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_put32.3.html">18.2.182. shmem_put32</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_put32_nbi.3.html">18.2.183. shmem_put32_nbi</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_put64.3.html">18.2.184. shmem_put64</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_put64_nbi.3.html">18.2.185. shmem_put64_nbi</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_put8_nbi.3.html">18.2.186. shmem_put8_nbi</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_putmem.3.html">18.2.187. shmem_putmem</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_putmem_nbi.3.html">18.2.188. shmem_putmem_nbi</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_quiet.3.html">18.2.189. shmem_quiet</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_realloc.3.html">18.2.190. shmem_realloc</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_set_cache_inv.3.html">18.2.191. shmem_set_cache_inv</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_set_cache_line_inv.3.html">18.2.192. shmem_set_cache_line_inv</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_set_lock.3.html">18.2.193. shmem_set_lock</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_short_and_to_all.3.html">18.2.194. shmem_short_and_to_all</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_short_g.3.html">18.2.195. shmem_short_g</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_short_get.3.html">18.2.196. shmem_short_get</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_short_get_nbi.3.html">18.2.197. shmem_short_get_nbi</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_short_iget.3.html">18.2.198. shmem_short_iget</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_short_iput.3.html">18.2.199. shmem_short_iput</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_short_max_to_all.3.html">18.2.200. shmem_short_max_to_all</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_short_min_to_all.3.html">18.2.201. shmem_short_min_to_all</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_short_or_to_all.3.html">18.2.202. shmem_short_or_to_all</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_short_p.3.html">18.2.203. shmem_short_p</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_short_prod_to_all.3.html">18.2.204. shmem_short_prod_to_all</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_short_put.3.html">18.2.205. shmem_short_put</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_short_put_nbi.3.html">18.2.206. shmem_short_put_nbi</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_short_sum_to_all.3.html">18.2.207. shmem_short_sum_to_all</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_short_wait.3.html">18.2.208. shmem_short_wait</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_short_wait_until.3.html">18.2.209. shmem_short_wait_until</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_short_xor_to_all.3.html">18.2.210. shmem_short_xor_to_all</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_swap.3.html">18.2.211. shmem_swap</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_test_lock.3.html">18.2.212. shmem_test_lock</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_udcflush.3.html">18.2.213. shmem_udcflush</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_udcflush_line.3.html">18.2.214. shmem_udcflush_line</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_wait.3.html">18.2.215. shmem_wait</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmem_wait_until.3.html">18.2.216. shmem_wait_until</a></li>
<li class="toctree-l3"><a class="reference internal" href="shmemalign.3.html">18.2.217. shmemalign</a></li>
<li class="toctree-l3"><a class="reference internal" href="shrealloc.3.html">18.2.218. shrealloc</a></li>
<li class="toctree-l3"><a class="reference internal" href="start_pes.3.html">18.2.219. start_pes</a></li>
</ul>
</li>
</ul>
</li>
</ul>
</div>
</div>
</nav>
<section data-toggle="wy-nav-shift" class="wy-nav-content-wrap"><nav class="wy-nav-top" aria-label="Mobile navigation menu" >
<i data-toggle="wy-nav-top" class="fa fa-bars"></i>
<a href="../../index.html">Open MPI</a>
</nav>
<div class="wy-nav-content">
<div class="rst-content">
<div role="navigation" aria-label="Page navigation">
<ul class="wy-breadcrumbs">
<li><a href="../../index.html" class="icon icon-home" aria-label="Home"></a></li>
<li class="breadcrumb-item"><a href="../index.html"><span class="section-number">18. </span>OpenSHMEM manual pages</a></li>
<li class="breadcrumb-item"><a href="index.html"><span class="section-number">18.2. </span>OpenSHMEM API manual pages (section 3)</a></li>
<li class="breadcrumb-item active"><span class="section-number">18.2.96. </span>shmem_int_max_to_all</li>
<li class="wy-breadcrumbs-aside">
<a href="../../_sources/man-openshmem/man3/shmem_int_max_to_all.3.rst.txt" rel="nofollow"> View page source</a>
</li>
</ul>
<hr/>
</div>
<div role="main" class="document" itemscope="itemscope" itemtype="http://schema.org/Article">
<div itemprop="articleBody">
<style>
.wy-table-responsive table td,.wy-table-responsive table th{white-space:normal}
</style><div class="section" id="shmem-int-max-to-all">
<span id="id1"></span><h1><span class="section-number">18.2.96. </span>shmem_int_max_to_all<a class="headerlink" href="#shmem-int-max-to-all" title="Permalink to this heading"></a></h1>
<blockquote>
<div></div></blockquote>
<p><a class="reference internal" href="shmem_double_max_to_all.3.html#shmem-double-max-to-all"><span class="std std-ref">shmem_double_max_to_all</span></a>(3), <a class="reference internal" href="shmem_float_max_to_all.3.html#shmem-float-max-to-all"><span class="std std-ref">shmem_float_max_to_all</span></a>(3),
<a class="reference internal" href="#shmem-int-max-to-all"><span class="std std-ref">shmem_int_max_to_all</span></a>(3), shmem_int4_max_to_all(3),
shmem_int8_max_to_all(3), <a class="reference internal" href="shmem_long_max_to_all.3.html#shmem-long-max-to-all"><span class="std std-ref">shmem_long_max_to_all</span></a>(3),
<a class="reference internal" href="shmem_longdouble_max_to_all.3.html#shmem-longdouble-max-to-all"><span class="std std-ref">shmem_longdouble_max_to_all</span></a>(3), <a class="reference internal" href="shmem_longlong_max_to_all.3.html#shmem-longlong-max-to-all"><span class="std std-ref">shmem_longlong_max_to_all</span></a>(3),
shmem_real4_max_to_all(3), shmem_real8_max_to_all(3),
shmem_real16_max_to_all(3), <a class="reference internal" href="shmem_short_max_to_all.3.html#shmem-short-max-to-all"><span class="std std-ref">shmem_short_max_to_all</span></a>(3) - Performs
a maximum function reduction across a set of processing elements (PEs).</p>
<div class="section" id="synopsis">
<h2><span class="section-number">18.2.96.1. </span>SYNOPSIS<a class="headerlink" href="#synopsis" title="Permalink to this heading"></a></h2>
<p>C or C++:</p>
<div class="highlight-c++ notranslate"><div class="highlight"><pre><span></span><span class="cp">#include</span><span class="w"> </span><span class="cpf"><mpp/shmem.h></span>
<span class="kt">void</span><span class="w"> </span><span class="n">shmem_double_max_to_all</span><span class="p">(</span><span class="kt">double</span><span class="w"> </span><span class="o">*</span><span class="n">target</span><span class="p">,</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="kt">double</span><span class="w"> </span><span class="o">*</span><span class="n">source</span><span class="p">,</span>
<span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">nreduce</span><span class="p">,</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">PE_start</span><span class="p">,</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">logPE_stride</span><span class="p">,</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">PE_size</span><span class="p">,</span>
<span class="w"> </span><span class="kt">double</span><span class="w"> </span><span class="o">*</span><span class="n">pWrk</span><span class="p">,</span><span class="w"> </span><span class="kt">long</span><span class="w"> </span><span class="o">*</span><span class="n">pSync</span><span class="p">)</span>
<span class="kt">void</span><span class="w"> </span><span class="n">shmem_float_max_to_all</span><span class="p">(</span><span class="kt">float</span><span class="w"> </span><span class="o">*</span><span class="n">target</span><span class="p">,</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="kt">float</span><span class="w"> </span><span class="o">*</span><span class="n">source</span><span class="p">,</span>
<span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">nreduce</span><span class="p">,</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">PE_start</span><span class="p">,</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">logPE_stride</span><span class="p">,</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">PE_size</span><span class="p">,</span>
<span class="w"> </span><span class="kt">float</span><span class="w"> </span><span class="o">*</span><span class="n">pWrk</span><span class="p">,</span><span class="w"> </span><span class="kt">long</span><span class="w"> </span><span class="o">*</span><span class="n">pSync</span><span class="p">)</span>
<span class="kt">void</span><span class="w"> </span><span class="n">shmem_int_max_to_all</span><span class="p">(</span><span class="kt">int</span><span class="w"> </span><span class="o">*</span><span class="n">target</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="o">*</span><span class="n">source</span><span class="p">,</span>
<span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">nreduce</span><span class="p">,</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">PE_start</span><span class="p">,</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">logPE_stride</span><span class="p">,</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">PE_size</span><span class="p">,</span>
<span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="o">*</span><span class="n">pWrk</span><span class="p">,</span><span class="w"> </span><span class="kt">long</span><span class="w"> </span><span class="o">*</span><span class="n">pSync</span><span class="p">)</span>
<span class="kt">void</span><span class="w"> </span><span class="n">shmem_long_max_to_all</span><span class="p">(</span><span class="kt">long</span><span class="w"> </span><span class="o">*</span><span class="n">target</span><span class="p">,</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="kt">long</span><span class="w"> </span><span class="o">*</span><span class="n">source</span><span class="p">,</span>
<span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">nreduce</span><span class="p">,</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">PE_start</span><span class="p">,</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">logPE_stride</span><span class="p">,</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">PE_size</span><span class="p">,</span>
<span class="w"> </span><span class="kt">long</span><span class="w"> </span><span class="o">*</span><span class="n">pWrk</span><span class="p">,</span><span class="w"> </span><span class="kt">long</span><span class="w"> </span><span class="o">*</span><span class="n">pSync</span><span class="p">)</span>
<span class="kt">void</span><span class="w"> </span><span class="n">shmem_longdouble_max_to_all</span><span class="p">(</span><span class="kt">long</span><span class="w"> </span><span class="kt">double</span><span class="w"> </span><span class="o">*</span><span class="n">target</span><span class="p">,</span>
<span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="kt">long</span><span class="w"> </span><span class="kt">double</span><span class="w"> </span><span class="o">*</span><span class="n">source</span><span class="p">,</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">nreduce</span><span class="p">,</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">PE_start</span><span class="p">,</span>
<span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">logPE_stride</span><span class="p">,</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">PE_size</span><span class="p">,</span><span class="w"> </span><span class="kt">long</span><span class="w"> </span><span class="kt">double</span><span class="w"> </span><span class="o">*</span><span class="n">pWrk</span><span class="p">,</span><span class="w"> </span><span class="kt">long</span><span class="w"> </span><span class="o">*</span><span class="n">pSync</span><span class="p">)</span>
<span class="kt">void</span><span class="w"> </span><span class="n">shmem_longlong_max_to_all</span><span class="p">(</span><span class="kt">long</span><span class="w"> </span><span class="kt">long</span><span class="w"> </span><span class="o">*</span><span class="n">target</span><span class="p">,</span>
<span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="kt">long</span><span class="w"> </span><span class="kt">long</span><span class="w"> </span><span class="o">*</span><span class="n">source</span><span class="p">,</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">nreduce</span><span class="p">,</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">PE_start</span><span class="p">,</span>
<span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">logPE_stride</span><span class="p">,</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">PE_size</span><span class="p">,</span><span class="w"> </span><span class="kt">long</span><span class="w"> </span><span class="kt">long</span><span class="w"> </span><span class="o">*</span><span class="n">pWrk</span><span class="p">,</span><span class="w"> </span><span class="kt">long</span><span class="w"> </span><span class="o">*</span><span class="n">pSync</span><span class="p">)</span>
<span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="n">shmem_short_max_to_all</span><span class="p">(</span><span class="kt">short</span><span class="w"> </span><span class="o">*</span><span class="n">target</span><span class="p">,</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="kt">short</span><span class="w"> </span><span class="o">*</span><span class="n">source</span><span class="p">,</span>
<span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">nreduce</span><span class="p">,</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">PE_start</span><span class="p">,</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">logPE_stride</span><span class="p">,</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">PE_size</span><span class="p">,</span>
<span class="w"> </span><span class="kt">short</span><span class="w"> </span><span class="o">*</span><span class="n">pWrk</span><span class="p">,</span><span class="w"> </span><span class="kt">long</span><span class="w"> </span><span class="o">*</span><span class="n">pSync</span><span class="p">)</span>
</pre></div>
</div>
<p>Fortran:</p>
<div class="highlight-fortran notranslate"><div class="highlight"><pre><span></span><span class="k">INCLUDE</span><span class="w"> </span><span class="s2">"mpp/shmem.fh"</span>
<span class="kt">INTEGER </span><span class="n">pSync</span><span class="p">(</span><span class="n">SHMEM_REDUCE_SYNC_SIZE</span><span class="p">)</span>
<span class="kt">INTEGER </span><span class="n">nreduce</span><span class="p">,</span><span class="w"> </span><span class="n">PE_start</span><span class="p">,</span><span class="w"> </span><span class="n">logPE_stride</span><span class="p">,</span><span class="w"> </span><span class="n">PE_size</span>
<span class="k">CALL </span><span class="n">SHMEM_INT4_MAX_TO_ALL</span><span class="p">(</span><span class="k">target</span><span class="p">,</span><span class="w"> </span><span class="n">source</span><span class="p">,</span><span class="w"> </span><span class="n">nreduce</span><span class="p">,</span>
<span class="p">&</span><span class="w"> </span><span class="n">PE_start</span><span class="p">,</span><span class="w"> </span><span class="n">logPE_stride</span><span class="p">,</span><span class="w"> </span><span class="n">PE_size</span><span class="p">,</span><span class="w"> </span><span class="n">pWrk</span><span class="p">,</span><span class="w"> </span><span class="n">pSync</span><span class="p">)</span>
<span class="k">CALL </span><span class="n">SHMEM_INT8_MAX_TO_ALL</span><span class="p">(</span><span class="k">target</span><span class="p">,</span><span class="w"> </span><span class="n">source</span><span class="p">,</span><span class="w"> </span><span class="n">nreduce</span><span class="p">,</span>
<span class="p">&</span><span class="w"> </span><span class="n">PE_start</span><span class="p">,</span><span class="w"> </span><span class="n">logPE_stride</span><span class="p">,</span><span class="w"> </span><span class="n">PE_size</span><span class="p">,</span><span class="w"> </span><span class="n">pWrk</span><span class="p">,</span><span class="w"> </span><span class="n">pSync</span><span class="p">)</span>
<span class="k">CALL </span><span class="n">SHMEM_REAL4_MAX_TO_ALL</span><span class="p">(</span><span class="k">target</span><span class="p">,</span><span class="w"> </span><span class="n">source</span><span class="p">,</span><span class="w"> </span><span class="n">nreduce</span><span class="p">,</span>
<span class="p">&</span><span class="w"> </span><span class="n">PE_start</span><span class="p">,</span><span class="w"> </span><span class="n">logPE_stride</span><span class="p">,</span><span class="w"> </span><span class="n">PE_size</span><span class="p">,</span><span class="w"> </span><span class="n">pWrk</span><span class="p">,</span><span class="w"> </span><span class="n">pSync</span><span class="p">)</span>
<span class="k">CALL </span><span class="n">SHMEM_REAL8_MAX_TO_ALL</span><span class="p">(</span><span class="k">target</span><span class="p">,</span><span class="w"> </span><span class="n">source</span><span class="p">,</span><span class="w"> </span><span class="n">nreduce</span><span class="p">,</span>
<span class="p">&</span><span class="w"> </span><span class="n">PE_start</span><span class="p">,</span><span class="w"> </span><span class="n">logPE_stride</span><span class="p">,</span><span class="w"> </span><span class="n">PE_size</span><span class="p">,</span><span class="w"> </span><span class="n">pWrk</span><span class="p">,</span><span class="w"> </span><span class="n">pSync</span><span class="p">)</span>
<span class="k">CALL </span><span class="n">SHMEM_REAL16_MAX_TO_ALL</span><span class="p">(</span><span class="k">target</span><span class="p">,</span><span class="w"> </span><span class="n">source</span><span class="p">,</span><span class="w"> </span><span class="n">nreduce</span><span class="p">,</span>
<span class="p">&</span><span class="w"> </span><span class="n">PE_start</span><span class="p">,</span><span class="w"> </span><span class="n">logPE_stride</span><span class="p">,</span><span class="w"> </span><span class="n">PE_size</span><span class="p">,</span><span class="w"> </span><span class="n">pWrk</span><span class="p">,</span><span class="w"> </span><span class="n">pSync</span><span class="p">)</span>
</pre></div>
</div>
</div>
<div class="section" id="description">
<h2><span class="section-number">18.2.96.2. </span>DESCRIPTION<a class="headerlink" href="#description" title="Permalink to this heading"></a></h2>
<p>The shared memory (SHMEM) reduction routines compute one or more
reductions across symmetric arrays on multiple virtual PEs. A reduction
performs an associative binary operation across a set of values. For a
list of other SHMEM reduction routines, see <em>intro_shmem</em>(3).</p>
<p>As with all SHMEM collective routines, each of these routines assumes
that only PEs in the active set call the routine. If a PE not in the
active set calls a SHMEM collective routine, undefined behavior results.</p>
<p>The nreduce argument determines the number of separate reductions to
perform. The source array on all PEs in the active set provides one
element for each reduction. The results of the reductions are placed in
the target array on all PEs in the active set. The active set is defined
by the PE_start, logPE_stride, PE_size triplet.</p>
<p>The source and target arrays may be the same array, but they may not be
overlapping arrays.</p>
<p>The arguments are as follows:</p>
<dl class="simple">
<dt>target</dt><dd><p>A symmetric array of length nreduce elements to receive the results
of the reduction operations. The data type of target varies with the
version of the reduction routine being called. When calling from C,
refer to the SYNOPSIS section for data type information.</p>
</dd>
</dl>
<p>When calling from Fortran, the target data types are as follows:</p>
<blockquote>
<div><dl class="simple">
<dt>shmem_comp8_max_to_all: Complex, with an element size equal to two</dt><dd><p>8-byte real values.</p>
</dd>
</dl>
<p>shmem_int4_max_to_all: Integer, with an element size of 4 bytes.</p>
<p>shmem_int8_max_to_all: Integer, with an element size of 8 bytes.</p>
<p>shmem_real4_max_to_all: Real, with an element size of 4 bytes.</p>
<p>shmem_real16_max_to_all: Real, with an element size of 16 bytes.</p>
</div></blockquote>
<dl class="simple">
<dt>source</dt><dd><p>A symmetric array of length nreduce elements that contains one
element for each separate reduction operation. The source argument
must have the same data type as target.</p>
</dd>
<dt>nreduce</dt><dd><p>The number of elements in the target and source arrays. nreduce must
be of type integer. If you are using Fortran, it must be a default
integer value.</p>
</dd>
<dt>PE_start</dt><dd><p>The lowest virtual PE number of the active set of PEs. PE_start must
be of type integer. If you are using Fortran, it must be a default
integer value.</p>
</dd>
<dt>logPE_stride</dt><dd><p>The log (base 2) of the stride between consecutive virtual PE numbers
in the active set. logPE_stride must be of type integer. If you are
using Fortran, it must be a default integer value.</p>
</dd>
<dt>PE_size</dt><dd><p>The number of PEs in the active set. PE_size must be of type integer.
If you are using Fortran, it must be a default integer value.</p>
</dd>
<dt>pWrk</dt><dd><p>A symmetric work array. The pWrk argument must have the same data
type as target. In C/C++, this contains max(nreduce/2 + 1,
_SHMEM_REDUCE_MIN_WRKDATA_SIZE) elements. In Fortran, this contains
max(nreduce/2 + 1, SHMEM_REDUCE_MIN_WRKDATA_SIZE) elements.</p>
</dd>
<dt>pSync</dt><dd><p>A symmetric work array. In C/C++, pSync is of type long and size
_SHMEM_REDUCE_SYNC_SIZE. In Fortran, pSync is of type integer and
size SHMEM_REDUCE_SYNC_SIZE. If you are using Fortran, it must be a
default integer value. Every element of this array must be
initialized with the value _SHMEM_SYNC_VALUE (in C/C++) or
SHMEM_SYNC_VALUE (in Fortran) before any of the PEs in the active set
enter the reduction routine.</p>
</dd>
</dl>
<p>The values of arguments nreduce, PE_start, logPE_stride, and PE_size
must be equal on all PEs in the active set. The same target and source
arrays, and the same pWrk and pSync work arrays, must be passed to all
PEs in the active set.</p>
<p>Before any PE calls a reduction routine, you must ensure that the
following conditions exist (synchronization via a barrier or some other
method is often needed to ensure this): The pWrk and pSync arrays on all
PEs in the active set are not still in use from a prior call to a
collective SHMEM routine. The target array on all PEs in the active set
is ready to accept the results of the reduction.</p>
<p>Upon return from a reduction routine, the following are true for the
local PE: The target array is updated. The values in the pSync array are
restored to the original values.</p>
</div>
<div class="section" id="notes">
<h2><span class="section-number">18.2.96.3. </span>NOTES<a class="headerlink" href="#notes" title="Permalink to this heading"></a></h2>
<p>The terms collective, symmetric, and cache aligned are defined in
<em>intro_shmem</em>(3). All SHMEM reduction routines reset the values in
pSync before they return, so a particular pSync buffer need only be
initialized the first time it is used.</p>
<p>You must ensure that the pSync array is not being updated on any PE in
the active set while any of the PEs participate in processing of a SHMEM
reduction routine. Be careful of the following situations: If the pSync
array is initialized at run time, some type of synchronization is needed
to ensure that all PEs in the working set have initialized pSync before
any of them enter a SHMEM routine called with the pSync synchronization
array. A pSync or pWrk array can be reused in a subsequent reduction
routine call only if none of the PEs in the active set are still
processing a prior reduction routine call that used the same pSync or
pWrk arrays.</p>
<p>In general, this can be assured only by doing some type of
synchronization. However, in the special case of reduction routines
being called with the same active set, you can allocate two pSync and
pWrk arrays and alternate between them on successive calls.</p>
</div>
<div class="section" id="examples">
<h2><span class="section-number">18.2.96.4. </span>EXAMPLES<a class="headerlink" href="#examples" title="Permalink to this heading"></a></h2>
<p><strong>Example 1:</strong> This Fortran example statically initializes the pSync
array and finds the maximum value of real variable FOO across all even
PEs.</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>INCLUDE "mpp/shmem.fh"
INTEGER PSYNC(SHMEM_REDUCE_SYNC_SIZE)
DATA PSYNC /SHMEM_REDUCE_SYNC_SIZE*SHMEM_SYNC_VALUE/
PARAMETER (NR=1)
REAL FOO, FOOMAX, PWRK(MAX(NR/2+1,SHMEM_REDUCE_MIN_WRKDATA_SIZE))
COMMON /COM/ FOO, FOOMAX, PWRK
INTRINSIC MY_PE
IF ( MOD(MY_PE(),2) .EQ. 0) THEN
CALL SHMEM_REAL8_MAX_TO_ALL(FOOMAX, FOO, NR, 0, 1, N$PES/2,
& PWRK, PSYNC)
PRINT *, 'Result on PE ', MY_PE(), ' is ', FOOMAX
ENDIF
</pre></div>
</div>
<p><strong>Example 2:</strong> Consider the following C/C++ call:</p>
<div class="highlight-c++ notranslate"><div class="highlight"><pre><span></span><span class="n">shmem_int_max_to_all</span><span class="p">(</span><span class="w"> </span><span class="n">target</span><span class="p">,</span><span class="w"> </span><span class="n">source</span><span class="p">,</span><span class="w"> </span><span class="mi">3</span><span class="p">,</span><span class="w"> </span><span class="mi">0</span><span class="p">,</span><span class="w"> </span><span class="mi">0</span><span class="p">,</span><span class="w"> </span><span class="mi">8</span><span class="p">,</span><span class="w"> </span><span class="n">pwrk</span><span class="p">,</span><span class="w"> </span><span class="n">psync</span><span class="w"> </span><span class="p">);</span>
</pre></div>
</div>
<p>The preceding call is more efficient, but semantically equivalent to,
the combination of the following calls:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>shmem_int_max_to_all(&(target[0]), &(source[0]), 1, 0, 0, 8,
pwrk1, psync1);
shmem_int_max_to_all(&(target[1]), &(source[1]), 1, 0, 0, 8,
pwrk2, psync2);
shmem_int_max_to_all(&(target[2]), &(source[2]), 1, 0, 0, 8,
pwrk1, psync1);
</pre></div>
</div>
<p>Note that two sets of pWrk and pSync arrays are used alternately because
no synchronization is done between calls.</p>
<div class="admonition seealso">
<p class="admonition-title">See also</p>
<p><em>intro_shmem</em>(3)</p>
</div>
</div>
</div>
</div>
</div>
<footer><div class="rst-footer-buttons" role="navigation" aria-label="Footer">
<a href="shmem_int_iput.3.html" class="btn btn-neutral float-left" title="18.2.95. shmem_int_iput" accesskey="p" rel="prev"><span class="fa fa-arrow-circle-left" aria-hidden="true"></span> Previous</a>
<a href="shmem_int_min_to_all.3.html" class="btn btn-neutral float-right" title="18.2.97. shmem_int_min_to_all" accesskey="n" rel="next">Next <span class="fa fa-arrow-circle-right" aria-hidden="true"></span></a>
</div>
<hr/>
<div role="contentinfo">
<p>© Copyright 2003-2025, The Open MPI Community.
<span class="lastupdated">Last updated on 2025-05-30 16:41:43 UTC.
</span></p>
</div>
Built with <a href="https://www.sphinx-doc.org/">Sphinx</a> using a
<a href="https://github.com/readthedocs/sphinx_rtd_theme">theme</a>
provided by <a href="https://readthedocs.org">Read the Docs</a>.
</footer>
</div>
</div>
</section>
</div>
<script>
jQuery(function () {
SphinxRtdTheme.Navigation.enable(true);
});
</script>
</body>
</html>
|
