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Slurm/Task-Affinity - Versionsgeschichte
2026-04-13T02:27:46Z
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Brendel: /* Checking with htop */ HT
2021-09-20T20:43:22Z
<p><span dir="auto"><span class="autocomment">Checking with htop: </span> HT</span></p>
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Nächstältere Version</td>
<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Version vom 20. September 2021, 22:43 Uhr</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>= Checking with <code>htop</code> =</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>= Checking with <code>htop</code> =</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>Following <code>/proc/cpuinfo</code>, the "<del style="font-weight: bold; text-decoration: none;">effective </del>core id" of <code>htop</code> is T*32+S*16+C with</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>Following <code>/proc/cpuinfo</code>, the "<ins style="font-weight: bold; text-decoration: none;">logical </ins>core id" of <code>htop</code> <ins style="font-weight: bold; text-decoration: none;">on a ''Xeon Gold 6226R'' </ins>is T*32+S*16+C with</div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>* T = thread-ID ϵ {0,1} (the two threads on a core)</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>* T = thread-ID ϵ {0,1} (the two threads on a core <ins style="font-weight: bold; text-decoration: none;">for enabled hyperthreading</ins>)</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* S = socket-ID ϵ {0,1} (the two CPUs with 16 cores)</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* S = socket-ID ϵ {0,1} (the two CPUs with 16 cores)</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* C = core-ID ϵ {0,1,...,15} (the 16 physical cores)</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* C = core-ID ϵ {0,1,...,15} (the 16 physical cores)</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>In other words, the 4 columns in "htop" are S0T0 | S1T0 | S0T1 | S1T1, and <del style="font-weight: bold; text-decoration: none;">avoiding hyper threading means to fill only the first two columns</del>.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>In other words, the 4 columns in "htop" are S0T0 | S1T0 | S0T1 | S1T1 <ins style="font-weight: bold; text-decoration: none;">with hyperthreading</ins>, and <ins style="font-weight: bold; text-decoration: none;">S0 | S0 | S1 | S1 without</ins>.</div></td></tr>
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Brendel
https://wiki.uni-due.de/ittp/index.php?title=Slurm/Task-Affinity&diff=12&oldid=prev
Brendel: neu
2021-09-18T05:54:17Z
<p>neu</p>
<p><b>Neue Seite</b></p><div>Cf. https://www.glennklockwood.com/hpc-howtos/process-affinity.html for an explanation.<br />
<br />
Slurm is configured with <code>TaskPlugin=task/affinity</code> and ''can'' reserve cores for a job. <code>srun</code>'s option <code>--cpu-bind</code> provides detailed control for that.<br />
<br />
= Checking with <code>htop</code> =<br />
<br />
Following <code>/proc/cpuinfo</code>, the "effective core id" of <code>htop</code> is T*32+S*16+C with<br />
* T = thread-ID ϵ {0,1} (the two threads on a core)<br />
* S = socket-ID ϵ {0,1} (the two CPUs with 16 cores)<br />
* C = core-ID ϵ {0,1,...,15} (the 16 physical cores)<br />
<br />
In other words, the 4 columns in "htop" are S0T0 | S1T0 | S0T1 | S1T1, and avoiding hyper threading means to fill only the first two columns.</div>
Brendel