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<h1 id="memory-widget"><a class="toclink" href="#memory-widget">Memory Widget</a></h1>
<p>The memory widget provides a visual representation of RAM and swap usage over time.</p>
<figure>
<img src="../../../assets/screenshots/memory.webp" alt="A picture of an expanded memory widget."/>
</figure>
<h2 id="features"><a class="toclink" href="#features">Features</a></h2>
<p>The legend displays the current usage in terms of percentage and actual usage in binary units (KiB, MiB, GiB, etc.).
If the total RAM or swap available is 0, then it is automatically hidden from the legend and graph.</p>
<p>One can also adjust the displayed time range through either the keyboard or mouse, with a range of 30s to 600s.</p>
<p>This widget can also be configured to display Nvidia and AMD GPU memory usage (<code>--disable_gpu</code> on Linux/Windows to disable) or cache memory usage (<code>--enable_cache_memory</code>).</p>
<h2 id="key-bindings"><a class="toclink" href="#key-bindings">Key bindings</a></h2>
<p>Note that key bindings are generally case-sensitive.</p>
<table>
<thead>
<tr>
<th>Binding</th>
<th>Action</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="keys"><kbd class="key-plus">+</kbd></span></td>
<td>Zoom in on chart (decrease time range)</td>
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<tr>
<td><span class="keys"><kbd class="key-minus">-</kbd></span></td>
<td>Zoom out on chart (increase time range)</td>
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<td>Reset zoom</td>
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<h2 id="mouse-bindings"><a class="toclink" href="#mouse-bindings">Mouse bindings</a></h2>
<table>
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<th>Binding</th>
<th>Action</th>
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<tbody>
<tr>
<td><span class="keys"><kbd>Scroll</kbd></span></td>
<td>Scrolling up or down zooms in or out of the graph respectively</td>
</tr>
</tbody>
</table>
<h2 id="how-are-memory-values-determined"><a class="toclink" href="#how-are-memory-values-determined">How are memory values determined?</a></h2>
<h3 id="linux"><a class="toclink" href="#linux">Linux</a></h3>
<p>Memory usage is calculated using the following formula based on values from <code>/proc/meminfo</code> (based on <a href="https://github.com/htop-dev/htop/blob/976c6123f41492aaf613b9d172eef1842fb7b0a3/linux/LinuxProcessList.c#L1584">htop's implementation</a>):</p>
<div class="highlight"><pre><span></span><code>MemTotal - MemFree - Buffers - (Cached + SReclaimable - Shmem)
</code></pre></div>
<p>You can find more info on <code>/proc/meminfo</code> and its fields <a href="https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/6/html/deployment_guide/s2-proc-meminfo">here</a>.</p>
<h3 id="windows"><a class="toclink" href="#windows">Windows</a></h3>
<p>In Windows, we calculate swap by querying <code>Get-Counter "\Paging File(*)\% Usage"</code>. This
is also what some libraries like <a href="https://github.com/giampaolo/psutil/blob/master/psutil/arch/windows/mem.c">psutil</a> use. However, note there are also a few other valid methods of
representing "swap" in Windows (e.g. using <code>GetPerformanceInfo</code>), which all slightly don't
match.</p>
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