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
|
<!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>8. History — OpenPMIx 5.0.8a1 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="9. Version Numbers and Binary Compatibility" href="versions.html" />
<link rel="prev" title="7. Release Notes" href="release-notes.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">
OpenPMIx
</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="exceptions.html">4. Exceptions to the PMIx Standard</a></li>
<li class="toctree-l1"><a class="reference internal" href="installing-pmix/index.html">5. Building and installing PMIx</a></li>
<li class="toctree-l1"><a class="reference internal" href="how-things-work/index.html">6. How Things Work</a></li>
<li class="toctree-l1"><a class="reference internal" href="release-notes.html">7. Release Notes</a></li>
<li class="toctree-l1 current"><a class="current reference internal" href="#">8. History</a></li>
<li class="toctree-l1"><a class="reference internal" href="versions.html">9. Version Numbers and Binary Compatibility</a></li>
<li class="toctree-l1"><a class="reference internal" href="mca.html">10. The Modular Component Architecture (MCA)</a></li>
<li class="toctree-l1"><a class="reference internal" href="building-apps/index.html">11. Building PMIx applications</a></li>
<li class="toctree-l1"><a class="reference internal" href="developers/index.html">12. Developer’s guide</a></li>
<li class="toctree-l1"><a class="reference internal" href="contributing.html">13. Contributing to OpenPMIx</a></li>
<li class="toctree-l1"><a class="reference internal" href="license.html">14. License</a></li>
<li class="toctree-l1"><a class="reference internal" href="security.html">15. OpenPMIx Security Policy</a></li>
<li class="toctree-l1"><a class="reference internal" href="news/index.html">16. News</a></li>
<li class="toctree-l1"><a class="reference internal" href="man/index.html">17. OpenPMIx manual pages</a></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">OpenPMIx</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 active"><span class="section-number">8. </span>History</li>
<li class="wy-breadcrumbs-aside">
<a href="_sources/history.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="history">
<h1><span class="section-number">8. </span>History<a class="headerlink" href="#history" title="Permalink to this heading"></a></h1>
<p>The Process Management Interface (PMI) has been used for quite some
time as a means of exchanging wireup information needed for
interprocess communication. Two versions (PMI-1 and PMI-2) have been
released as part of the MPICH effort. While PMI-2 demonstrates better
scaling properties than its PMI-1 predecessor, attaining rapid launch
and wireup of the roughly 1M processes executing across 100k nodes
expected for exascale operations remains challenging.</p>
<p>PMI Exascale (PMIx) represents an attempt to resolve these questions
by providing an extended version of the PMI standard specifically
designed to support clusters up to and including exascale sizes. The
overall objective of the project is not to branch the existing
pseudo-standard definitions - in fact, PMIx fully supports both of the
existing PMI-1 and PMI-2 APIs - but rather to (a) augment and extend
those APIs to eliminate some current restrictions that impact
scalability, and (b) provide a reference implementation of the
PMI-server that demonstrates the desired level of scalability.</p>
</div>
</div>
</div>
<footer><div class="rst-footer-buttons" role="navigation" aria-label="Footer">
<a href="release-notes.html" class="btn btn-neutral float-left" title="7. Release Notes" accesskey="p" rel="prev"><span class="fa fa-arrow-circle-left" aria-hidden="true"></span> Previous</a>
<a href="versions.html" class="btn btn-neutral float-right" title="9. Version Numbers and Binary Compatibility" accesskey="n" rel="next">Next <span class="fa fa-arrow-circle-right" aria-hidden="true"></span></a>
</div>
<hr/>
<div role="contentinfo">
<p>© Copyright 2014-2025, OpenPMIx Community.
<span class="lastupdated">Last updated on 2025-05-30 16:40:24 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>
|
