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<li class="toctree-l1 current"><a class="reference internal" href="index.html">7. Host specification</a><ul class="current">
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<li class="toctree-l2"><a class="reference internal" href="rm.html">7.1. Resource Manager-Provided Hosts</a></li>
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<h1><span class="section-number">7.3. </span>Listing Hosts on the Command Line<a class="headerlink" href="#listing-hosts-on-the-command-line" title="Permalink to this heading"></a></h1>
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<p>Many PRRTE commands accept the <code class="docutils literal notranslate"><span class="pre">--host</span></code> CLI parameter.
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<code class="docutils literal notranslate"><span class="pre">--host</span></code> accepts a comma-delimited list of tokens of the form:</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">host</span><span class="p">[:</span><span class="n">slots</span><span class="p">]</span>
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</pre></div>
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</div>
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<p>The <code class="docutils literal notranslate"><span class="pre">host</span></code> token can be either:</p>
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<ul class="simple">
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<li><p>A name that resolves to an IP address, or</p></li>
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<li><p>An IP address</p></li>
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</ul>
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<div class="admonition note">
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<p class="admonition-title">Note</p>
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<p>The names and/or IP addresses of hosts are <em>only</em> used for
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identifying the target host on which to launch. They are
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<em>not</em> used for determining which network interfaces are used
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by applications (e.g., MPI or other network-based
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applications).</p>
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<p>For network-based applications, consult their documentation
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for how to specify which network interfaces are used.</p>
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</div>
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<p>The optional integer <code class="docutils literal notranslate"><span class="pre">:slots</span></code> parameter tells PRRTE the maximum
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number of slots to use on that host (see this section on definition
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of the term <code class="docutils literal notranslate"><span class="pre">slot</span></code> for a description of what a “slot” is).</p>
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<p>For example:</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">prterun</span> <span class="o">--</span><span class="n">host</span> <span class="n">node1</span><span class="p">:</span><span class="mi">10</span><span class="p">,</span><span class="n">node2</span><span class="p">,</span><span class="n">node3</span><span class="p">:</span><span class="mi">5</span> <span class="o">...</span>
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<li class="toctree-l1 current"><a class="reference internal" href="index.html">7. Host specification</a><ul class="current">
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<li class="toctree-l2"><a class="reference internal" href="rm.html">7.1. Resource Manager-Provided Hosts</a></li>
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<li class="toctree-l2 current"><a class="current reference internal" href="#">7.2. Hostfiles</a></li>
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<li class="toctree-l2"><a class="reference internal" href="cli.html">7.3. Listing Hosts on the Command Line</a></li>
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<li class="toctree-l2"><a class="reference internal" href="relative-indexing.html">7.4. Relative host indexing</a></li>
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</ul>
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<li class="toctree-l1"><a class="reference internal" href="../placement/index.html">8. Process placement</a></li>
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<h1><span class="section-number">7.2. </span>Hostfiles<a class="headerlink" href="#hostfiles" title="Permalink to this heading"></a></h1>
|
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<p>Hostfiles (sometimes called “machine files”) are a combination of two
|
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things:</p>
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<ol class="arabic simple">
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<li><p>A listing of hosts on which to launch processes.</p></li>
|
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<li><p>Optionally, limit the number of processes which can be launched on
|
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each host.</p></li>
|
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</ol>
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<p>Hostfile syntax consists of one node name on each line, optionally
|
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including a designated number of “slots”:</p>
|
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<div class="highlight-sh notranslate"><div class="highlight"><pre><span></span><span class="c1"># This is a comment line, and will be ignored</span>
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node01<span class="w"> </span><span class="nv">slots</span><span class="o">=</span><span class="m">10</span>
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node13<span class="w"> </span><span class="nv">slots</span><span class="o">=</span><span class="m">5</span>
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node15
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node16
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node17<span class="w"> </span><span class="nv">slots</span><span class="o">=</span><span class="m">3</span>
|
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...
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</pre></div>
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</div>
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<p>Blank lines and lines beginning with a <code class="docutils literal notranslate"><span class="pre">#</span></code> are ignored.</p>
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<p>A “slot” is the PRRTE term for an allocatable unit where we can launch
|
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a process. See the section on definition of the term <code class="docutils literal notranslate"><span class="pre">slot</span></code> for a
|
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longer description of slots.</p>
|
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<p>In the absence of the <code class="docutils literal notranslate"><span class="pre">slot</span></code> parameter, PRRTE will assign either the
|
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number of slots to be the number of CPUs detected on the node or the
|
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resource manager-assigned value if operating in the presence of an
|
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RM.</p>
|
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<div class="admonition important">
|
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<p class="admonition-title">Important</p>
|
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<p>If using a resource manager, the user-specified number
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of slots is capped by the RM-assigned value.</p>
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<h1><span class="section-number">7. </span>Host specification<a class="headerlink" href="#host-specification" title="Permalink to this heading"></a></h1>
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<p>PRRTE identifies hosts on which to launch processes by:</p>
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<li><p>A Resource Manager (RM) telling PRRTE which hosts to use</p></li>
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<h1><span class="section-number">7.4. </span>Relative host indexing<a class="headerlink" href="#relative-host-indexing" title="Permalink to this heading"></a></h1>
|
||||
<p>Hostfile and <code class="docutils literal notranslate"><span class="pre">--host</span></code> specifications can also be made using relative
|
||||
indexing. This allows a user to stipulate which hosts are to be used
|
||||
for a given app context without specifying the particular host name,
|
||||
but rather its relative position in the allocation.</p>
|
||||
<p>This can probably best be understood through consideration of a few
|
||||
examples. Consider the case where a DVM is comprised of a set of nodes
|
||||
named <code class="docutils literal notranslate"><span class="pre">foo1</span></code>, <code class="docutils literal notranslate"><span class="pre">foo2</span></code>, <code class="docutils literal notranslate"><span class="pre">foo3</span></code>, <code class="docutils literal notranslate"><span class="pre">foo4</span></code>. The user wants the first
|
||||
app context to have exclusive use of the first two nodes, and a second
|
||||
app context to use the last two nodes. Of course, the user could
|
||||
printout the allocation to find the names of the nodes allocated to
|
||||
them and then use <code class="docutils literal notranslate"><span class="pre">--host</span></code> to specify this layout, but this is
|
||||
cumbersome and would require hand-manipulation for every invocation.</p>
|
||||
<p>A simpler method is to utilize PRRTE’s relative indexing capability to
|
||||
specify the desired layout. In this case, a command line containing:</p>
|
||||
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="o">--</span><span class="n">host</span> <span class="o">+</span><span class="n">n1</span><span class="p">,</span><span class="o">+</span><span class="n">n2</span> <span class="o">./</span><span class="n">app1</span> <span class="p">:</span> <span class="o">--</span><span class="n">host</span> <span class="o">+</span><span class="n">n3</span><span class="p">,</span><span class="o">+</span><span class="n">n4</span> <span class="o">./</span><span class="n">app2</span>
|
||||
</pre></div>
|
||||
</div>
|
||||
<p>would provide the desired pattern. The <code class="docutils literal notranslate"><span class="pre">+</span></code> syntax indicates that the
|
||||
information is being provided as a relative index into the existing
|
||||
allocation. Two methods of relative indexing are supported:</p>
|
||||
<ul class="simple">
|
||||
<li><p><code class="docutils literal notranslate"><span class="pre">+n#</span></code>: A relative index into the allocation referencing the <code class="docutils literal notranslate"><span class="pre">#</span></code>
|
||||
node. PRRTE will substitute the <code class="docutils literal notranslate"><span class="pre">#</span></code> node in the allocation</p></li>
|
||||
<li><p><code class="docutils literal notranslate"><span class="pre">+e[:#]</span></code>: A request for <code class="docutils literal notranslate"><span class="pre">#</span></code> empty nodes — i.e., PRRTE is
|
||||
to substitute this reference with nodes that have not yet been used
|
||||
by any other app_context. If the <code class="docutils literal notranslate"><span class="pre">:#</span></code> is not provided, PRRTE will
|
||||
substitute the reference with all empty nodes. Note that PRRTE does
|
||||
track the empty nodes that have been assigned in this manner, so
|
||||
multiple uses of this option will result in assignment of unique
|
||||
nodes up to the limit of the available empty nodes. Requests for
|
||||
more empty nodes than are available will generate an error.</p></li>
|
||||
</ul>
|
||||
<p>Relative indexing can be combined with absolute naming of hosts in any
|
||||
arbitrary manner, and can be used in hostfiles as well as with the
|
||||
<code class="docutils literal notranslate"><span class="pre">--host</span></code> command line option. In addition, any slot specification
|
||||
provided in hostfiles will be respected — thus, a user can
|
||||
specify that only a certain number of slots from a relative indexed
|
||||
host are to be used for a given app context.</p>
|
||||
<p>Another example may help illustrate this point. Consider the case
|
||||
where the user has a hostfile containing:</p>
|
||||
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">dummy1</span> <span class="n">slots</span><span class="o">=</span><span class="mi">4</span>
|
||||
<span class="n">dummy2</span> <span class="n">slots</span><span class="o">=</span><span class="mi">4</span>
|
||||
<span class="n">dummy3</span> <span class="n">slots</span><span class="o">=</span><span class="mi">4</span>
|
||||
<span class="n">dummy4</span> <span class="n">slots</span><span class="o">=</span><span class="mi">4</span>
|
||||
<span class="n">dummy5</span> <span class="n">slots</span><span class="o">=</span><span class="mi">4</span>
|
||||
</pre></div>
|
||||
</div>
|
||||
<p>This may, for example, be a hostfile that describes a set of
|
||||
commonly-used resources that the user wishes to execute applications
|
||||
against. For this particular application, the user plans to map
|
||||
byslot, and wants the first two ranks to be on the second node of any
|
||||
allocation, the next ranks to land on an empty node, have one rank
|
||||
specifically on <code class="docutils literal notranslate"><span class="pre">dummy4</span></code>, the next rank to be on the second node of the
|
||||
allocation again, and finally any remaining ranks to be on whatever
|
||||
empty nodes are left. To accomplish this, the user provides a hostfile
|
||||
of:</p>
|
||||
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="o">+</span><span class="n">n2</span> <span class="n">slots</span><span class="o">=</span><span class="mi">2</span>
|
||||
<span class="o">+</span><span class="n">e</span><span class="p">:</span><span class="mi">1</span>
|
||||
<span class="n">dummy4</span> <span class="n">slots</span><span class="o">=</span><span class="mi">1</span>
|
||||
<span class="o">+</span><span class="n">n2</span>
|
||||
<span class="o">+</span><span class="n">e</span>
|
||||
</pre></div>
|
||||
</div>
|
||||
<p>The user can now use this information in combination with PRRTE’s
|
||||
sequential mapper to obtain their specific layout:</p>
|
||||
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="o"><</span><span class="n">launcher</span><span class="o">></span> <span class="o">--</span><span class="n">hostfile</span> <span class="n">dummyhosts</span> <span class="o">--</span><span class="n">hostfile</span> <span class="n">mylayout</span> <span class="o">--</span><span class="n">prtemca</span> <span class="n">rmaps</span> <span class="n">seq</span> <span class="o">./</span><span class="n">my_app</span>
|
||||
</pre></div>
|
||||
</div>
|
||||
<p>which will result in:</p>
|
||||
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">rank0</span> <span class="n">being</span> <span class="n">mapped</span> <span class="n">to</span> <span class="n">dummy3</span>
|
||||
<span class="n">rank1</span> <span class="n">to</span> <span class="n">dummy1</span> <span class="k">as</span> <span class="n">the</span> <span class="n">first</span> <span class="n">empty</span> <span class="n">node</span>
|
||||
<span class="n">rank2</span> <span class="n">to</span> <span class="n">dummy4</span>
|
||||
<span class="n">rank3</span> <span class="n">to</span> <span class="n">dummy3</span>
|
||||
<span class="n">rank4</span> <span class="n">to</span> <span class="n">dummy2</span> <span class="ow">and</span> <span class="n">rank5</span> <span class="n">to</span> <span class="n">dummy5</span> <span class="k">as</span> <span class="n">the</span> <span class="n">last</span> <span class="n">remaining</span> <span class="n">unused</span> <span class="n">nodes</span>
|
||||
</pre></div>
|
||||
</div>
|
||||
<p>Note that the sequential mapper ignores the number of slots arguments
|
||||
as it only maps one rank at a time to each node in the list.</p>
|
||||
<p>If the default round-robin mapper had been used, then the mapping
|
||||
would have resulted in:</p>
|
||||
<ul class="simple">
|
||||
<li><p>ranks 0 and 1 being mapped to dummy3 since two slots were specified</p></li>
|
||||
<li><p>ranks 2-5 on dummy1 as the first empty node, which has four slots</p></li>
|
||||
<li><p>rank6 on dummy4 since the hostfile specifies only a single slot from
|
||||
that node is to be used</p></li>
|
||||
<li><p>ranks 7 and 8 on dummy3 since only two slots remain available</p></li>
|
||||
<li><p>ranks 9-12 on dummy2 since it is the next available empty node and
|
||||
has four slots</p></li>
|
||||
<li><p>ranks 13-16 on dummy5 since it is the last remaining unused node and
|
||||
has four slots</p></li>
|
||||
</ul>
|
||||
<p>Thus, the use of relative indexing can allow for complex mappings to
|
||||
be ported across allocations, including those obtained from automated
|
||||
resource managers, without the need for manual manipulation of scripts
|
||||
and/or command lines.</p>
|
||||
</div>
|
||||
|
||||
|
||||
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|
||||
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|
||||
<footer><div class="rst-footer-buttons" role="navigation" aria-label="Footer">
|
||||
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||||
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|
||||
|
||||
<hr/>
|
||||
|
||||
<div role="contentinfo">
|
||||
<p>© Copyright 2003-2025, The PRRTE Community.</p>
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||||
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|
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|
||||
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139
macx64/mpi/openmpi/share/doc/prrte/html/hosts/rm.html
Normal file
139
macx64/mpi/openmpi/share/doc/prrte/html/hosts/rm.html
Normal file
@@ -0,0 +1,139 @@
|
||||
<!DOCTYPE html>
|
||||
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|
||||
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|
||||
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|
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|
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|
||||
<link rel="stylesheet" type="text/css" href="../_static/pygments.css" />
|
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|
||||
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|
||||
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|
||||
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|
||||
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|
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<li class="toctree-l1"><a class="reference internal" href="../quickstart.html">1. Quick start</a></li>
|
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<li class="toctree-l1"><a class="reference internal" href="../release-notes.html">2. Release Notes</a></li>
|
||||
<li class="toctree-l1"><a class="reference internal" href="../getting-help.html">3. Getting help</a></li>
|
||||
<li class="toctree-l1"><a class="reference internal" href="../install.html">4. Installing PRRTE</a></li>
|
||||
<li class="toctree-l1"><a class="reference internal" href="../configuration.html">5. PRRTE DVM Configuration</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 current"><a class="reference internal" href="index.html">7. Host specification</a><ul class="current">
|
||||
<li class="toctree-l2 current"><a class="current reference internal" href="#">7.1. Resource Manager-Provided Hosts</a></li>
|
||||
<li class="toctree-l2"><a class="reference internal" href="hostfiles.html">7.2. Hostfiles</a></li>
|
||||
<li class="toctree-l2"><a class="reference internal" href="cli.html">7.3. Listing Hosts on the Command Line</a></li>
|
||||
<li class="toctree-l2"><a class="reference internal" href="relative-indexing.html">7.4. Relative host indexing</a></li>
|
||||
</ul>
|
||||
</li>
|
||||
<li class="toctree-l1"><a class="reference internal" href="../placement/index.html">8. Process placement</a></li>
|
||||
<li class="toctree-l1"><a class="reference internal" href="../notifications.html">9. Notifications</a></li>
|
||||
<li class="toctree-l1"><a class="reference internal" href="../session-directory.html">10. Session directory</a></li>
|
||||
<li class="toctree-l1"><a class="reference internal" href="../developers/index.html">11. Developer’s guide</a></li>
|
||||
<li class="toctree-l1"><a class="reference internal" href="../contributing.html">12. Contributing to PRRTE</a></li>
|
||||
<li class="toctree-l1"><a class="reference internal" href="../license.html">13. License</a></li>
|
||||
<li class="toctree-l1"><a class="reference internal" href="../man/index.html">14. PRRTE manual pages</a></li>
|
||||
<li class="toctree-l1"><a class="reference internal" href="../versions.html">15. Software Version Numbers</a></li>
|
||||
<li class="toctree-l1"><a class="reference internal" href="../news/index.html">16. News</a></li>
|
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|
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|
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|
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<li><a href="../index.html" class="icon icon-home" aria-label="Home"></a></li>
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<li class="breadcrumb-item"><a href="index.html"><span class="section-number">7. </span>Host specification</a></li>
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<li class="breadcrumb-item active"><span class="section-number">7.1. </span>Resource Manager-Provided Hosts</li>
|
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<li class="wy-breadcrumbs-aside">
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<a href="../_sources/hosts/rm.rst.txt" rel="nofollow"> View page source</a>
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|
||||
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|
||||
<div role="main" class="document" itemscope="itemscope" itemtype="http://schema.org/Article">
|
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<div itemprop="articleBody">
|
||||
|
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<style>
|
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.wy-table-responsive table td,.wy-table-responsive table th{white-space:normal}
|
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</style><div class="section" id="resource-manager-provided-hosts">
|
||||
<h1><span class="section-number">7.1. </span>Resource Manager-Provided Hosts<a class="headerlink" href="#resource-manager-provided-hosts" title="Permalink to this heading"></a></h1>
|
||||
<p>When launching under a Resource Manager (RM), the RM usually
|
||||
picks which hosts — and how many processes can be launched on
|
||||
each host — on a per-job basis.</p>
|
||||
<p>The RM will communicate this information to PRRTE directly; users can
|
||||
simply omit specifying hosts or numbers of processes.</p>
|
||||
</div>
|
||||
|
||||
|
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Reference in New Issue
Block a user