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<p class="caption" role="heading"><span class="caption-text">Nsight Compute</span></p>
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<section id="updates-in-2020-3">
<h1>Updates in 2020.3<a class="headerlink" href="#updates-in-2020-3" title="Permalink to this headline"></a></h1>
<p><strong>General</strong></p>
<ul class="simple">
<li><p>Added support for <em>derived metrics</em> in section files. Derived metrics can be used to create new metrics based on existing metrics and constants. See the <a class="reference external" href="../CustomizationGuide/index.html#section-derived-metrics">Customization Guide</a> for details.</p></li>
<li><p>Added a new <em>Import Source</em> (<code class="docutils literal notranslate"><span class="pre">--import-source</span></code>) option to the UI and command line to permanently import source files into the report, when available.</p></li>
<li><p>Added a new section that shows selected <em>NVLink</em> metrics on supported systems.</p></li>
<li><p>Added a new <code class="docutils literal notranslate"><span class="pre">launch__func_cache_config</span></code> metric to the <em>Launch Statistics</em> section.</p></li>
<li><p>Added new branch efficiency metrics to the <em>Source Counters</em> section, including <code class="docutils literal notranslate"><span class="pre">smsp__sass_average_branch_targets_threads_uniform.pct</span></code> to replace nvprof’s <code class="docutils literal notranslate"><span class="pre">branch_efficiency</span></code>, as well as instruction-level metrics <code class="docutils literal notranslate"><span class="pre">smsp__branch_targets_threads_divergent</span></code>, <code class="docutils literal notranslate"><span class="pre">smsp__branch_targets_threads_uniform</span></code> and <code class="docutils literal notranslate"><span class="pre">branch_inst_executed</span></code>.</p></li>
<li><p>A warning is shown if kernel replay starts staging GPU memory to CPU memory or the file system.</p></li>
<li><p>Section and rule files are deployed to a versioned directory in the user’s home directory to allow easier editing of those files, and to prevent modifying the base installation.</p></li>
<li><p>Removed support for NVLINK(<code class="docutils literal notranslate"><span class="pre">nvl*</span></code>) metrics due to a potential application hang during data collection. The metrics will be added back in a future version of the driver/tool.</p></li>
</ul>
<p><strong>NVIDIA Nsight Compute</strong></p>
<ul class="simple">
<li><p>Added support for <em>Profile Series</em>. Series allow you to profile a kernel with a range of configurable parameters to analyze the performance of each combination.</p></li>
<li><p>Added a new <em>Allocations</em> view to the <em>Resources</em> tool window which shows the state of all current memory allocations.</p></li>
<li><p>Added a new <em>Memory Pools</em> view to the <em>Resources</em> tool window which shows the state of all current memory pools.</p></li>
<li><p>Added coverage of peer memory to the <em>Memory Chart</em>.</p></li>
<li><p>The <em>Source</em> page now shows the number of excessive sectors requested from L1 or L2, e.g. due to uncoalesced memory accesses.</p></li>
<li><p>The <em>Source</em> column on the <em>Source</em> page can now be scrolled horizontally.</p></li>
<li><p>The kernel duration <code class="docutils literal notranslate"><span class="pre">gpu__time_duration.sum</span></code> was added as column on the <em>Summary</em> page.</p></li>
<li><p>Improved the performance of <em>application replay</em> when not all kernels in the application are profiled.</p></li>
</ul>
<p><strong>NVIDIA Nsight Compute CLI</strong></p>
<ul class="simple">
<li><p>Added a new <code class="docutils literal notranslate"><span class="pre">--app-replay-match</span></code> option to select the mechanism used for matching kernel instances across application replay passes.</p></li>
<li><p>An error is shown if <code class="docutils literal notranslate"><span class="pre">--nvtx-include/exclude</span></code> are used without <code class="docutils literal notranslate"><span class="pre">--nvtx</span></code>.</p></li>
</ul>
<p><strong>Resolved Issues</strong></p>
<ul class="simple">
<li><p>The <em>Grid Size</em> column on the <em>Raw</em> page now shows the CUDA grid size like the <em>Launch Statistics</em> section, rather than the combined grid and block sizes.</p></li>
<li><p>The <em>Branch Resolving</em> wap stall reason was added to the PC sampling metric groups and the <em>Warp State Statistics</em> section.</p></li>
<li><p>The <em>API Stream</em> tool window shows kernel names according to the selected Function Name Mode.</p></li>
<li><p>Fixed that an incorrect line could be shown after a heatmap selection on the <em>Source</em> page.</p></li>
<li><p>Fixed incorrect metric usage for system memory in the <em>Memory Chart</em>. Previously, all requested memory of L2 from system memory was reported instead of only the portion that missed in L2.</p></li>
</ul>
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