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<div class="section" id="mps-environment-variables">
<span id="id1"></span><h1>MPS Environment Variables<a class="headerlink" href="#mps-environment-variables" title="Permalink to this heading">¶</a></h1>
<p><strong>PyTorch Environment Variables</strong></p>
<table class="docutils colwidths-auto align-default">
<thead>
<tr class="row-odd"><th class="head"><p>Variable</p></th>
<th class="head"><p>Description</p></th>
</tr>
</thead>
<tbody>
<tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">PYTORCH_DEBUG_MPS_ALLOCATOR</span></code></p></td>
<td><p>If set to <code class="docutils literal notranslate"><span class="pre">1</span></code>, set allocator logging level to verbose.</p></td>
</tr>
<tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">PYTORCH_MPS_LOG_PROFILE_INFO</span></code></p></td>
<td><p>Set log options bitmask to <code class="docutils literal notranslate"><span class="pre">MPSProfiler</span></code>. See <code class="docutils literal notranslate"><span class="pre">LogOptions</span></code> enum in <cite>aten/src/ATen/mps/MPSProfiler.h</cite> for available options.</p></td>
</tr>
<tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">PYTORCH_MPS_TRACE_SIGNPOSTS</span></code></p></td>
<td><p>Set profile and signpost bitmasks to <code class="docutils literal notranslate"><span class="pre">MPSProfiler</span></code>. See <code class="docutils literal notranslate"><span class="pre">ProfileOptions</span></code> and <code class="docutils literal notranslate"><span class="pre">SignpostTypes</span></code> enums in <cite>aten/src/ATen/mps/MPSProfiler.h</cite> for available options.</p></td>
</tr>
<tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">PYTORCH_MPS_HIGH_WATERMARK_RATIO</span></code></p></td>
<td><p>High watermark ratio for MPS allocator. By default, it is set to 1.7.</p></td>
</tr>
<tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">PYTORCH_MPS_LOW_WATERMARK_RATIO</span></code></p></td>
<td><p>Low watermark ratio for MPS allocator. By default, it is set to 1.4 if the memory is unified and set to 1.0 if the memory is discrete.</p></td>
</tr>
<tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">PYTORCH_MPS_FAST_MATH</span></code></p></td>
<td><p>If set to <code class="docutils literal notranslate"><span class="pre">1</span></code>, enable fast math for MPS metal kernels. See section 1.6.3 in <a class="reference external" href="https://developer.apple.com/metal/Metal-Shading-Language-Specification.pdf">https://developer.apple.com/metal/Metal-Shading-Language-Specification.pdf</a> for precision implications.</p></td>
</tr>
<tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">PYTORCH_MPS_PREFER_METAL</span></code></p></td>
<td><p>If set to <code class="docutils literal notranslate"><span class="pre">1</span></code>, force using metal kernels instead of using MPS Graph APIs. For now this is only used for matmul op.</p></td>
</tr>
<tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">PYTORCH_ENABLE_MPS_FALLBACK</span></code></p></td>
<td><p>If set to <code class="docutils literal notranslate"><span class="pre">1</span></code>, full back operations to CPU when MPS does not support them.</p></td>
</tr>
</tbody>
</table>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p><strong>high watermark ratio</strong> is a hard limit for the total allowed allocations</p>
<ul class="simple">
<li><p><cite>0.0</cite> : disables high watermark limit (may cause system failure if system-wide OOM occurs)</p></li>
<li><p><cite>1.0</cite> : recommended maximum allocation size (i.e., device.recommendedMaxWorkingSetSize)</p></li>
<li><p><cite>>1.0</cite>: allows limits beyond the device.recommendedMaxWorkingSetSize</p></li>
</ul>
<p>e.g., value 0.95 means we allocate up to 95% of recommended maximum
allocation size; beyond that, the allocations would fail with OOM error.</p>
<p><strong>low watermark ratio</strong> is a soft limit to attempt limiting memory allocations up to the lower watermark
level by garbage collection or committing command buffers more frequently (a.k.a, adaptive commit).
Value between 0 to m_high_watermark_ratio (setting 0.0 disables adaptive commit and garbage collection)
e.g., value 0.9 means we ‘attempt’ to limit allocations up to 90% of recommended maximum
allocation size.</p>
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