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Merlin6 CPU nodes definition
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Merlin6 CPU cluster
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Merlin6 CPU partitions
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Merlin5 CPU Accounts
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Private accounts
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<h1 id="slurm-configuration">Slurm Configuration<a class="headerlink" href="#slurm-configuration" title="Permanent link"></a></h1>
<p>This documentation shows basic Slurm configuration and options needed to run jobs in the Merlin6 CPU cluster.</p>
<h2 id="merlin6-cpu-nodes-definition">Merlin6 CPU nodes definition<a class="headerlink" href="#merlin6-cpu-nodes-definition" title="Permanent link"></a></h2>
<p>The following table show default and maximum resources that can be used per node:</p>
<table>
<thead>
<tr>
<th style="text-align: center;">Nodes</th>
<th style="text-align: right;">Def.#CPUs</th>
<th style="text-align: center;">Max.#CPUs</th>
<th style="text-align: center;">#Threads</th>
<th style="text-align: center;">Max.Mem/CPU</th>
<th style="text-align: center;">Max.Mem/Node</th>
<th style="text-align: center;">Max.Swap</th>
<th style="text-align: center;">Def.#GPUs</th>
<th style="text-align: center;">Max.#GPUs</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align: center;">merlin-c-[301-312]</td>
<td style="text-align: right;">1 core</td>
<td style="text-align: center;">44 cores</td>
<td style="text-align: center;">2</td>
<td style="text-align: center;">748800</td>
<td style="text-align: center;">748800</td>
<td style="text-align: center;">10000</td>
<td style="text-align: center;">N/A</td>
<td style="text-align: center;">N/A</td>
</tr>
<tr>
<td style="text-align: center;">merlin-c-[313-318]</td>
<td style="text-align: right;">1 core</td>
<td style="text-align: center;">44 cores</td>
<td style="text-align: center;">1</td>
<td style="text-align: center;">748800</td>
<td style="text-align: center;">748800</td>
<td style="text-align: center;">10000</td>
<td style="text-align: center;">N/A</td>
<td style="text-align: center;">N/A</td>
</tr>
<tr>
<td style="text-align: center;">merlin-c-[319-324]</td>
<td style="text-align: right;">1 core</td>
<td style="text-align: center;">44 cores</td>
<td style="text-align: center;">2</td>
<td style="text-align: center;">748800</td>
<td style="text-align: center;">748800</td>
<td style="text-align: center;">10000</td>
<td style="text-align: center;">N/A</td>
<td style="text-align: center;">N/A</td>
</tr>
</tbody>
</table>
<p>If nothing is specified, by default each core will use up to 8GB of memory. Memory can be increased with the <code>--mem=&lt;mem_in_MB&gt;</code> and
<code>--mem-per-cpu=&lt;mem_in_MB&gt;</code> options, and maximum memory allowed is <code>Max.Mem/Node</code>.</p>
<p>In <strong><code>merlin6</code></strong>, Memory is considered a Consumable Resource, as well as the CPU. Hence, both resources will account when submitting a job,
and by default resources can not be oversubscribed. </p>
<p>and memory was by default oversubscribed.</p>
<div class="admonition tip">
<p class="admonition-title">Check Configuration</p>
<p>Always check <code>/etc/slurm/slurm.conf</code> for changes in the hardware.</p>
</div>
<h3 id="merlin6-cpu-cluster">Merlin6 CPU cluster<a class="headerlink" href="#merlin6-cpu-cluster" title="Permanent link"></a></h3>
<p>To run jobs in the <strong><code>merlin6</code></strong> cluster users <strong>can optionally</strong> specify the cluster name in Slurm:</p>
<div class="language-bash highlight"><span class="filename">Bash</span><pre><span></span><code><span id="__span-0-1"><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a><span class="c1">#SBATCH --cluster=merlin6</span>
</span></code></pre></div>
<p>If no cluster name is specified, by default any job will be submitted to this cluster (as this is the main cluster).
Hence, this would be only necessary if one has to deal with multiple clusters or when one has defined some environmental
variables which can modify the cluster name.</p>
<h3 id="merlin6-cpu-partitions">Merlin6 CPU partitions<a class="headerlink" href="#merlin6-cpu-partitions" title="Permanent link"></a></h3>
<p>Users might need to specify the Slurm partition. If no partition is specified, it will default to <strong><code>general</code></strong>:</p>
<div class="language-bash highlight"><span class="filename">Bash</span><pre><span></span><code><span id="__span-1-1"><a id="__codelineno-1-1" name="__codelineno-1-1" href="#__codelineno-1-1"></a><span class="c1">#SBATCH --partition=&lt;partition_name&gt; # Possible &lt;partition_name&gt; values: general, daily, hourly</span>
</span></code></pre></div>
<p>The following <em>partitions</em> (also known as <em>queues</em>) are configured in Slurm:</p>
<table>
<thead>
<tr>
<th style="text-align: center;">CPU Partition</th>
<th style="text-align: center;">Default Time</th>
<th style="text-align: center;">Max Time</th>
<th style="text-align: center;">Max Nodes</th>
<th style="text-align: center;">PriorityJobFactor*</th>
<th style="text-align: center;">PriorityTier**</th>
<th style="text-align: center;">DefMemPerCPU</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align: center;"><strong><u>general</u></strong></td>
<td style="text-align: center;">1 day</td>
<td style="text-align: center;">1 week</td>
<td style="text-align: center;">50</td>
<td style="text-align: center;">1</td>
<td style="text-align: center;">1</td>
<td style="text-align: center;">4000</td>
</tr>
<tr>
<td style="text-align: center;"><strong>daily</strong></td>
<td style="text-align: center;">1 day</td>
<td style="text-align: center;">1 day</td>
<td style="text-align: center;">67</td>
<td style="text-align: center;">500</td>
<td style="text-align: center;">1</td>
<td style="text-align: center;">4000</td>
</tr>
<tr>
<td style="text-align: center;"><strong>hourly</strong></td>
<td style="text-align: center;">1 hour</td>
<td style="text-align: center;">1 hour</td>
<td style="text-align: center;">unlimited</td>
<td style="text-align: center;">1000</td>
<td style="text-align: center;">1</td>
<td style="text-align: center;">4000</td>
</tr>
<tr>
<td style="text-align: center;"><strong>asa-general</strong></td>
<td style="text-align: center;">1 hour</td>
<td style="text-align: center;">2 weeks</td>
<td style="text-align: center;">unlimited</td>
<td style="text-align: center;">1</td>
<td style="text-align: center;">2</td>
<td style="text-align: center;">3712</td>
</tr>
<tr>
<td style="text-align: center;"><strong>asa-daily</strong></td>
<td style="text-align: center;">1 hour</td>
<td style="text-align: center;">1 week</td>
<td style="text-align: center;">unlimited</td>
<td style="text-align: center;">500</td>
<td style="text-align: center;">2</td>
<td style="text-align: center;">3712</td>
</tr>
<tr>
<td style="text-align: center;"><strong>asa-visas</strong></td>
<td style="text-align: center;">1 hour</td>
<td style="text-align: center;">90 days</td>
<td style="text-align: center;">unlimited</td>
<td style="text-align: center;">1000</td>
<td style="text-align: center;">4</td>
<td style="text-align: center;">3712</td>
</tr>
<tr>
<td style="text-align: center;"><strong>asa-ansys</strong></td>
<td style="text-align: center;">1 hour</td>
<td style="text-align: center;">90 days</td>
<td style="text-align: center;">unlimited</td>
<td style="text-align: center;">1000</td>
<td style="text-align: center;">4</td>
<td style="text-align: center;">15600</td>
</tr>
<tr>
<td style="text-align: center;"><strong>mu3e</strong></td>
<td style="text-align: center;">1 day</td>
<td style="text-align: center;">7 days</td>
<td style="text-align: center;">unlimited</td>
<td style="text-align: center;">1000</td>
<td style="text-align: center;">4</td>
<td style="text-align: center;">3712</td>
</tr>
</tbody>
</table>
<p>The <strong>PriorityJobFactor</strong> value will be added to the job priority (<strong>PARTITION</strong> column in <code>sprio -l</code> ). In other words, jobs sent to higher priority
partitions will usually run first (however, other factors such like <strong>job age</strong> or mainly <strong>fair share</strong> might affect to that decision). For the GPU
partitions, Slurm will also attempt first to allocate jobs on partitions with higher priority over partitions with lesser priority.</p>
<p>Jobs submitted to a partition with a higher <strong>PriorityTier</strong> value will be dispatched before pending jobs in partition with lower <em>PriorityTier</em> value
and, if possible, they will preempt running jobs from partitions with lower <strong>PriorityTier</strong> values.</p>
<ul>
<li>The <strong><code>general</code></strong> partition is the <strong>default</strong>. It can not have more than 50 nodes running jobs.</li>
<li>For <strong><code>daily</code></strong> this limitation is extended to 67 nodes.</li>
<li>For <strong><code>hourly</code></strong> there are no limits.</li>
<li><strong><code>asa-general</code>,<code>asa-daily</code>,<code>asa-ansys</code>,<code>asa-visas</code> and <code>mu3e</code></strong> are <strong>private</strong> partitions, belonging to different experiments owning the machines. <strong>Access is restricted</strong> in all cases. However, by agreement with the experiments, nodes are usually added to the <strong><code>hourly</code></strong> partition as extra resources for the public resources.</li>
</ul>
<div class="admonition tip">
<p class="admonition-title">Partition Selection</p>
<p>Jobs which would run for less than one day should be always sent to
<strong>daily</strong>, while jobs that would run for less than one hour should be sent
to <strong>hourly</strong>. This would ensure that you have highest priority over jobs
sent to partitions with less priority, but also because <strong>general</strong> has
limited the number of nodes that can be used for that. The idea behind
that, is that the cluster can not be blocked by long jobs and we can always
ensure resources for shorter jobs.</p>
</div>
<h3 id="merlin5-cpu-accounts">Merlin5 CPU Accounts<a class="headerlink" href="#merlin5-cpu-accounts" title="Permanent link"></a></h3>
<p>Users need to ensure that the public <strong><code>merlin</code></strong> account is specified. No specifying account options would default to this account.</p>
<p>This is mostly needed by users which have multiple Slurm accounts, which may define by mistake a different account.</p>
<div class="language-bash highlight"><span class="filename">Bash</span><pre><span></span><code><span id="__span-2-1"><a id="__codelineno-2-1" name="__codelineno-2-1" href="#__codelineno-2-1"></a><span class="c1">#SBATCH --account=merlin # Possible values: merlin, gfa-asa</span>
</span></code></pre></div>
<p>Not all the accounts can be used on all partitions. This is resumed in the table below:</p>
<table>
<thead>
<tr>
<th style="text-align: center;">Slurm Account</th>
<th style="text-align: center;">Slurm Partitions</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align: center;"><strong><u>merlin</u></strong></td>
<td style="text-align: center;"><code>hourly</code>,<code>daily</code>, <code>general</code></td>
</tr>
<tr>
<td style="text-align: center;"><strong>gfa-asa</strong></td>
<td style="text-align: center;"><code>asa-general</code>,<code>asa-daily</code>,<code>asa-visas</code>,<code>asa-ansys</code>,<code>hourly</code>,<code>daily</code>, <code>general</code></td>
</tr>
<tr>
<td style="text-align: center;"><strong>mu3e</strong></td>
<td style="text-align: center;"><code>mu3e</code></td>
</tr>
</tbody>
</table>
<h4 id="private-accounts">Private accounts<a class="headerlink" href="#private-accounts" title="Permanent link"></a></h4>
<ul>
<li>The <em><code>gfa-asa</code></em> and <em><code>mu3e</code></em> accounts are private accounts. These can be used for accessing dedicated partitions with nodes owned by different groups.</li>
</ul>
<h3 id="slurm-cpu-specific-options">Slurm CPU specific options<a class="headerlink" href="#slurm-cpu-specific-options" title="Permanent link"></a></h3>
<p>Some options are available when using CPUs. These are detailed here.
Alternative Slurm options for CPU based jobs are available. Please refer to the
<strong>man</strong> pages for each Slurm command for further information about it (<code>man
salloc</code>, <code>man sbatch</code>, <code>man srun</code>). Below are listed the most common settings:</p>
<div class="language-bash highlight"><span class="filename">Bash</span><pre><span></span><code><span id="__span-3-1"><a id="__codelineno-3-1" name="__codelineno-3-1" href="#__codelineno-3-1"></a><span class="c1">#SBATCH --hint=[no]multithread</span>
</span><span id="__span-3-2"><a id="__codelineno-3-2" name="__codelineno-3-2" href="#__codelineno-3-2"></a><span class="c1">#SBATCH --ntasks=&lt;ntasks&gt;</span>
</span><span id="__span-3-3"><a id="__codelineno-3-3" name="__codelineno-3-3" href="#__codelineno-3-3"></a><span class="c1">#SBATCH --ntasks-per-core=&lt;ntasks&gt;</span>
</span><span id="__span-3-4"><a id="__codelineno-3-4" name="__codelineno-3-4" href="#__codelineno-3-4"></a><span class="c1">#SBATCH --ntasks-per-socket=&lt;ntasks&gt;</span>
</span><span id="__span-3-5"><a id="__codelineno-3-5" name="__codelineno-3-5" href="#__codelineno-3-5"></a><span class="c1">#SBATCH --ntasks-per-node=&lt;ntasks&gt;</span>
</span><span id="__span-3-6"><a id="__codelineno-3-6" name="__codelineno-3-6" href="#__codelineno-3-6"></a><span class="c1">#SBATCH --mem=&lt;size[units]&gt;</span>
</span><span id="__span-3-7"><a id="__codelineno-3-7" name="__codelineno-3-7" href="#__codelineno-3-7"></a><span class="c1">#SBATCH --mem-per-cpu=&lt;size[units]&gt;</span>
</span><span id="__span-3-8"><a id="__codelineno-3-8" name="__codelineno-3-8" href="#__codelineno-3-8"></a><span class="c1">#SBATCH --cpus-per-task=&lt;ncpus&gt;</span>
</span><span id="__span-3-9"><a id="__codelineno-3-9" name="__codelineno-3-9" href="#__codelineno-3-9"></a><span class="c1">#SBATCH --cpu-bind=[{quiet,verbose},]&lt;type&gt; # only for 'srun' command</span>
</span></code></pre></div>
<h4 id="enablingdisabling-hyper-threading">Enabling/Disabling Hyper-Threading<a class="headerlink" href="#enablingdisabling-hyper-threading" title="Permanent link"></a></h4>
<p>The <strong><code>merlin6</code></strong> cluster contains nodes with Hyper-Threading enabled. One
should always specify whether to use Hyper-Threading or not. If not defined,
Slurm will generally use it (exceptions apply).</p>
<div class="language-bash highlight"><span class="filename">Bash</span><pre><span></span><code><span id="__span-4-1"><a id="__codelineno-4-1" name="__codelineno-4-1" href="#__codelineno-4-1"></a><span class="c1">#SBATCH --hint=multithread # Use extra threads with in-core multi-threading.</span>
</span><span id="__span-4-2"><a id="__codelineno-4-2" name="__codelineno-4-2" href="#__codelineno-4-2"></a><span class="c1">#SBATCH --hint=nomultithread # Don't use extra threads with in-core multi-threading.</span>
</span></code></pre></div>
<h4 id="constraint-features">Constraint / Features<a class="headerlink" href="#constraint-features" title="Permanent link"></a></h4>
<p>Slurm allows to define a set of features in the node definition. This can be used to filter and select nodes according to one or more
specific features. For the CPU nodes, we have the following features:</p>
<div class="language-text highlight"><span class="filename">Text Only</span><pre><span></span><code><span id="__span-5-1"><a id="__codelineno-5-1" name="__codelineno-5-1" href="#__codelineno-5-1"></a>NodeName=merlin-c-[001-024,101-124,201-224] Features=mem_384gb,xeon-gold-6152
</span><span id="__span-5-2"><a id="__codelineno-5-2" name="__codelineno-5-2" href="#__codelineno-5-2"></a>NodeName=merlin-c-[301-312] Features=mem_768gb,xeon-gold-6240r
</span><span id="__span-5-3"><a id="__codelineno-5-3" name="__codelineno-5-3" href="#__codelineno-5-3"></a>NodeName=merlin-c-[313-318] Features=mem_768gb,xeon-gold-6240r
</span><span id="__span-5-4"><a id="__codelineno-5-4" name="__codelineno-5-4" href="#__codelineno-5-4"></a>NodeName=merlin-c-[319-324] Features=mem_384gb,xeon-gold-6240r
</span></code></pre></div>
<p>Therefore, users running on <code>hourly</code> can select which node they want to use (fat memory nodes vs regular memory nodes, CPU type).
This is possible by using the option <code>--constraint=&lt;feature_name&gt;</code> in Slurm.</p>
<p>Examples:</p>
<ol>
<li>
<p>Select nodes with 48 cores only (nodes with <a href="https://ark.intel.com/content/www/us/en/ark/products/199343/intel-xeon-gold-6240r-processor-35-75m-cache-2-40-ghz.html">2 x Xeon Gold 6240R</a>):</p>
<div class="language-bash highlight"><span class="filename">Bash</span><pre><span></span><code><span id="__span-6-1"><a id="__codelineno-6-1" name="__codelineno-6-1" href="#__codelineno-6-1"></a>sbatch<span class="w"> </span>--constraint<span class="o">=</span>xeon-gold-6240r<span class="w"> </span>...
</span></code></pre></div>
</li>
<li>
<p>Select nodes with 44 cores only (nodes with <a href="https://ark.intel.com/content/www/us/en/ark/products/120491/intel-xeon-gold-6152-processor-30-25m-cache-2-10-ghz.html">2 x Xeon Gold 6152</a>):</p>
<div class="language-bash highlight"><span class="filename">Bash</span><pre><span></span><code><span id="__span-7-1"><a id="__codelineno-7-1" name="__codelineno-7-1" href="#__codelineno-7-1"></a>sbatch<span class="w"> </span>--constraint<span class="o">=</span>xeon-gold-6152<span class="w"> </span>...
</span></code></pre></div>
</li>
<li>
<p>Select fat memory nodes only:</p>
<div class="language-bash highlight"><span class="filename">Bash</span><pre><span></span><code><span id="__span-8-1"><a id="__codelineno-8-1" name="__codelineno-8-1" href="#__codelineno-8-1"></a>sbatch<span class="w"> </span>--constraint<span class="o">=</span>mem_768gb<span class="w"> </span>...
</span></code></pre></div>
</li>
<li>
<p>Select regular memory nodes only:</p>
<div class="language-bash highlight"><span class="filename">Bash</span><pre><span></span><code><span id="__span-9-1"><a id="__codelineno-9-1" name="__codelineno-9-1" href="#__codelineno-9-1"></a>sbatch<span class="w"> </span>--constraint<span class="o">=</span>mem_384gb<span class="w"> </span>...
</span></code></pre></div>
</li>
<li>
<p>Select fat memory nodes with 48 cores only:</p>
<div class="language-bash highlight"><span class="filename">Bash</span><pre><span></span><code><span id="__span-10-1"><a id="__codelineno-10-1" name="__codelineno-10-1" href="#__codelineno-10-1"></a>sbatch<span class="w"> </span>--constraint<span class="o">=</span>mem_768gb,xeon-gold-6240r<span class="w"> </span>...
</span></code></pre></div>
</li>
</ol>
<p>Detailing exactly which type of nodes you want to use is important, therefore, for groups with private accounts (<code>mu3e</code>,<code>gfa-asa</code>) or for
public users running on the <code>hourly</code> partition, <em>constraining nodes by features is recommended</em>. This becomes even more important when
having heterogeneous clusters.</p>
<h2 id="running-jobs-in-the-merlin6-cluster">Running jobs in the 'merlin6' cluster<a class="headerlink" href="#running-jobs-in-the-merlin6-cluster" title="Permanent link"></a></h2>
<p>In this chapter we will cover basic settings that users need to specify in order to run jobs in the Merlin6 CPU cluster.</p>
<h3 id="user-and-job-limits">User and job limits<a class="headerlink" href="#user-and-job-limits" title="Permanent link"></a></h3>
<p>In the CPU cluster we provide some limits which basically apply to jobs and users. The idea behind this is to ensure a fair usage of the resources and to
avoid overabuse of the resources from a single user or job. However, applying limits might affect the overall usage efficiency of the cluster (in example,
pending jobs from a single user while having many idle nodes due to low overall activity is something that can be seen when user limits are applied).
In the same way, these limits can be also used to improve the efficiency of the cluster (in example, without any job size limits, a job requesting all
resources from the batch system would drain the entire cluster for fitting the job, which is undesirable).</p>
<p>Hence, there is a need of setting up wise limits and to ensure that there is a fair usage of the resources, by trying to optimize the overall efficiency
of the cluster while allowing jobs of different nature and sizes (it is, <strong>single core</strong> based <strong>vs parallel jobs</strong> of different sizes) to run.</p>
<div class="admonition warning">
<p class="admonition-title">Resource Limits</p>
<p>Wide limits are provided in the <strong>daily</strong> and <strong>hourly</strong> partitions, while
for <strong>general</strong> those limits are more restrictive. However, we kindly ask
users to inform the Merlin administrators when there are plans to send big
jobs which would require a massive draining of nodes for allocating such
jobs. This would apply to jobs requiring the <strong>unlimited</strong> QoS (see below
"Per job limits").</p>
</div>
<div class="admonition tip">
<p class="admonition-title">Custom Requirements</p>
<p>If you have different requirements, please let us know, we will try to
accommodate or propose a solution for you.</p>
</div>
<h4 id="per-job-limits">Per job limits<a class="headerlink" href="#per-job-limits" title="Permanent link"></a></h4>
<p>These are limits which apply to a single job. In other words, there is a
maximum of resources a single job can use. Limits are described in the table
below with the format: <code>SlurmQoS(limits)</code> (possible <code>SlurmQoS</code> values can be
listed with the command <code>sacctmgr show qos</code>). Some limits will vary depending
on the day and time of the week.</p>
<table>
<thead>
<tr>
<th style="text-align: center;">Partition</th>
<th style="text-align: center;">Mon-Fri 0h-18h</th>
<th style="text-align: center;">Sun-Thu 18h-0h</th>
<th style="text-align: center;">From Fri 18h to Mon 0h</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align: center;"><strong>general</strong></td>
<td style="text-align: center;">normal(cpu=704,mem=2750G)</td>
<td style="text-align: center;">normal(cpu=704,mem=2750G)</td>
<td style="text-align: center;">normal(cpu=704,mem=2750G)</td>
</tr>
<tr>
<td style="text-align: center;"><strong>daily</strong></td>
<td style="text-align: center;">daytime(cpu=704,mem=2750G)</td>
<td style="text-align: center;">nighttime(cpu=1408,mem=5500G)</td>
<td style="text-align: center;">unlimited(cpu=2200,mem=8593.75G)</td>
</tr>
<tr>
<td style="text-align: center;"><strong>hourly</strong></td>
<td style="text-align: center;">unlimited(cpu=2200,mem=8593.75G)</td>
<td style="text-align: center;">unlimited(cpu=2200,mem=8593.75G)</td>
<td style="text-align: center;">unlimited(cpu=2200,mem=8593.75G)</td>
</tr>
</tbody>
</table>
<p>By default, a job can not use more than 704 cores (max CPU per job). In the
same way, memory is also proportionally limited. This is equivalent as running
a job using up to 8 nodes at once. This limit applies to the <strong>general</strong>
partition (fixed limit) and to the <strong>daily</strong> partition (only during working
hours).</p>
<p>Limits are softed for the <strong>daily</strong> partition during non working hours, and
during the weekend limits are even wider. For the <strong>hourly</strong> partition,
<strong>despite running many parallel jobs is something not desirable</strong> (for
allocating such jobs it requires massive draining of nodes), wider limits are
provided. In order to avoid massive nodes drain in the cluster, for allocating
huge jobs, setting per job limits is necessary. Hence, <strong>unlimited</strong> QoS mostly
refers to "per user" limits more than to "per job" limits (in other words,
users can run any number of hourly jobs, but the job size for such jobs is
limited with wide values).</p>
<h4 id="per-user-limits-for-cpu-partitions">Per user limits for CPU partitions<a class="headerlink" href="#per-user-limits-for-cpu-partitions" title="Permanent link"></a></h4>
<p>These limits which apply exclusively to users. In other words, there is a
maximum of resources a single user can use. Limits are described in the table
below with the format: <code>SlurmQoS(limits)</code> (possible <code>SlurmQoS</code> values can be
listed with the command <code>sacctmgr show qos</code>). Some limits will vary depending
on the day and time of the week.</p>
<table>
<thead>
<tr>
<th style="text-align: center;">Partition</th>
<th style="text-align: center;">Mon-Fri 0h-18h</th>
<th style="text-align: center;">Sun-Thu 18h-0h</th>
<th style="text-align: center;">From Fri 18h to Mon 0h</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align: center;"><strong>general</strong></td>
<td style="text-align: center;">normal(cpu=704,mem=2750G)</td>
<td style="text-align: center;">normal(cpu=704,mem=2750G)</td>
<td style="text-align: center;">normal(cpu=704,mem=2750G)</td>
</tr>
<tr>
<td style="text-align: center;"><strong>daily</strong></td>
<td style="text-align: center;">daytime(cpu=1408,mem=5500G)</td>
<td style="text-align: center;">nighttime(cpu=2112,mem=8250G)</td>
<td style="text-align: center;">unlimited(cpu=6336,mem=24750G)</td>
</tr>
<tr>
<td style="text-align: center;"><strong>hourly</strong></td>
<td style="text-align: center;">unlimited(cpu=6336,mem=24750G)</td>
<td style="text-align: center;">unlimited(cpu=6336,mem=24750G)</td>
<td style="text-align: center;">unlimited(cpu=6336,mem=24750G)</td>
</tr>
</tbody>
</table>
<p>By default, users can not use more than 704 cores at the same time (max CPU per
user). Memory is also proportionally limited in the same way. This is
equivalent to 8 exclusive nodes. This limit applies to the <strong>general</strong>
partition (fixed limit) and to the <strong>daily</strong> partition (only during working
hours).</p>
<p>For the <strong>hourly</strong> partition, there are no limits restriction and user limits
are removed. Limits are softed for the <strong>daily</strong> partition during non working
hours, and during the weekend limits are removed.</p>
<h2 id="advanced-slurm-configuration">Advanced Slurm configuration<a class="headerlink" href="#advanced-slurm-configuration" title="Permanent link"></a></h2>
<p>Clusters at PSI use the <a href="http://slurm.schedmd.com/">Slurm Workload Manager</a> as
the batch system technology for managing and scheduling jobs. Slurm has been
installed in a <strong>multi-clustered</strong> configuration, allowing to integrate
multiple clusters in the same batch system.</p>
<p>For understanding the Slurm configuration setup in the cluster, sometimes may be useful to check the following files:</p>
<ul>
<li><code>/etc/slurm/slurm.conf</code> - can be found in the login nodes and computing nodes.</li>
<li><code>/etc/slurm/gres.conf</code> - can be found in the GPU nodes, is also propgated to login nodes and computing nodes for user read access.</li>
<li><code>/etc/slurm/cgroup.conf</code> - can be found in the computing nodes, is also propagated to login nodes for user read access.</li>
</ul>
<p>The previous configuration files which can be found in the login nodes,
correspond exclusively to the <strong>merlin6</strong> cluster configuration files.</p>
<p>Configuration files for the <strong>gmerlin6</strong> cluster must be checked directly on the <strong>gmerlin6</strong> computing nodes (in example, by login in to one of the nodes while a job or an
active allocation is running).</p>
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