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| <section id="benchmarks"> |
| <span id="id1"></span><h1>Benchmarks<a class="headerlink" href="#benchmarks" title="Permalink to this heading">#</a></h1> |
| <section id="setup"> |
| <h2>Setup<a class="headerlink" href="#setup" title="Permalink to this heading">#</a></h2> |
| <p>First install the <a class="reference internal" href="continuous_integration/archery.html#archery"><span class="std std-ref">Archery</span></a> utility to run the benchmark suite.</p> |
| </section> |
| <section id="running-the-benchmark-suite"> |
| <h2>Running the benchmark suite<a class="headerlink" href="#running-the-benchmark-suite" title="Permalink to this heading">#</a></h2> |
| <p>The benchmark suites can be run with the <code class="docutils literal notranslate"><span class="pre">benchmark</span> <span class="pre">run</span></code> sub-command.</p> |
| <div class="highlight-shell notranslate"><div class="highlight"><pre><span></span><span class="c1"># Run benchmarks in the current git workspace</span> |
| archery<span class="w"> </span>benchmark<span class="w"> </span>run |
| <span class="c1"># Storing the results in a file</span> |
| archery<span class="w"> </span>benchmark<span class="w"> </span>run<span class="w"> </span>--output<span class="o">=</span>run.json |
| </pre></div> |
| </div> |
| <p>Sometimes, it is required to pass custom CMake flags, e.g.</p> |
| <div class="highlight-shell notranslate"><div class="highlight"><pre><span></span><span class="nb">export</span><span class="w"> </span><span class="nv">CC</span><span class="o">=</span>clang-8<span class="w"> </span><span class="nv">CXX</span><span class="o">=</span>clang++8 |
| archery<span class="w"> </span>benchmark<span class="w"> </span>run<span class="w"> </span>--cmake-extras<span class="o">=</span><span class="s2">"-DARROW_SIMD_LEVEL=NONE"</span> |
| </pre></div> |
| </div> |
| <p>Additionally a full CMake build directory may be specified.</p> |
| <div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>archery<span class="w"> </span>benchmark<span class="w"> </span>run<span class="w"> </span><span class="nv">$HOME</span>/arrow/cpp/release-build |
| </pre></div> |
| </div> |
| </section> |
| <section id="comparison"> |
| <h2>Comparison<a class="headerlink" href="#comparison" title="Permalink to this heading">#</a></h2> |
| <p>One goal with benchmarking is to detect performance regressions. To this end, |
| <code class="docutils literal notranslate"><span class="pre">archery</span></code> implements a benchmark comparison facility via the <code class="docutils literal notranslate"><span class="pre">benchmark</span> |
| <span class="pre">diff</span></code> sub-command.</p> |
| <p>In the default invocation, it will compare the current source (known as the |
| current workspace in git) with local main branch:</p> |
| <div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>archery<span class="w"> </span>--quiet<span class="w"> </span>benchmark<span class="w"> </span>diff<span class="w"> </span>--benchmark-filter<span class="o">=</span>FloatParsing |
| ----------------------------------------------------------------------------------- |
| Non-regressions:<span class="w"> </span><span class="o">(</span><span class="m">1</span><span class="o">)</span> |
| ----------------------------------------------------------------------------------- |
| <span class="w"> </span>benchmark<span class="w"> </span>baseline<span class="w"> </span>contender<span class="w"> </span>change<span class="w"> </span>%<span class="w"> </span>counters |
| <span class="w"> </span>FloatParsing<FloatType><span class="w"> </span><span class="m">105</span>.983M<span class="w"> </span>items/sec<span class="w"> </span><span class="m">105</span>.983M<span class="w"> </span>items/sec<span class="w"> </span><span class="m">0</span>.0<span class="w"> </span><span class="o">{}</span> |
| |
| ------------------------------------------------------------------------------------ |
| Regressions:<span class="w"> </span><span class="o">(</span><span class="m">1</span><span class="o">)</span> |
| ------------------------------------------------------------------------------------ |
| <span class="w"> </span>benchmark<span class="w"> </span>baseline<span class="w"> </span>contender<span class="w"> </span>change<span class="w"> </span>%<span class="w"> </span>counters |
| <span class="w"> </span>FloatParsing<DoubleType><span class="w"> </span><span class="m">209</span>.941M<span class="w"> </span>items/sec<span class="w"> </span><span class="m">109</span>.941M<span class="w"> </span>items/sec<span class="w"> </span>-47.632<span class="w"> </span><span class="o">{}</span> |
| </pre></div> |
| </div> |
| <p>For more information, invoke the <code class="docutils literal notranslate"><span class="pre">archery</span> <span class="pre">benchmark</span> <span class="pre">diff</span> <span class="pre">--help</span></code> command for |
| multiple examples of invocation.</p> |
| <section id="iterating-efficiently"> |
| <h3>Iterating efficiently<a class="headerlink" href="#iterating-efficiently" title="Permalink to this heading">#</a></h3> |
| <p>Iterating with benchmark development can be a tedious process due to long |
| build time and long run times. Multiple tricks can be used with |
| <code class="docutils literal notranslate"><span class="pre">archery</span> <span class="pre">benchmark</span> <span class="pre">diff</span></code> to reduce this overhead.</p> |
| <p>First, the benchmark command supports comparing existing |
| build directories, This can be paired with the <code class="docutils literal notranslate"><span class="pre">--preserve</span></code> flag to |
| avoid rebuilding sources from zero.</p> |
| <div class="highlight-shell notranslate"><div class="highlight"><pre><span></span><span class="c1"># First invocation clone and checkouts in a temporary directory. The</span> |
| <span class="c1"># directory is preserved with --preserve</span> |
| archery<span class="w"> </span>benchmark<span class="w"> </span>diff<span class="w"> </span>--preserve |
| |
| <span class="c1"># Modify C++ sources</span> |
| |
| <span class="c1"># Re-run benchmark in the previously created build directory.</span> |
| archery<span class="w"> </span>benchmark<span class="w"> </span>diff<span class="w"> </span>/tmp/arrow-bench*/<span class="o">{</span>WORKSPACE,master<span class="o">}</span>/build |
| </pre></div> |
| </div> |
| <p>Second, a benchmark run result can be saved in a json file. This also avoids |
| rebuilding the sources, but also executing the (sometimes) heavy benchmarks. |
| This technique can be used as a poor’s man caching.</p> |
| <div class="highlight-shell notranslate"><div class="highlight"><pre><span></span><span class="c1"># Run the benchmarks on a given commit and save the result</span> |
| archery<span class="w"> </span>benchmark<span class="w"> </span>run<span class="w"> </span>--output<span class="o">=</span>run-head-1.json<span class="w"> </span>HEAD~1 |
| <span class="c1"># Compare the previous captured result with HEAD</span> |
| archery<span class="w"> </span>benchmark<span class="w"> </span>diff<span class="w"> </span>HEAD<span class="w"> </span>run-head-1.json |
| </pre></div> |
| </div> |
| <p>Third, the benchmark command supports filtering suites (<code class="docutils literal notranslate"><span class="pre">--suite-filter</span></code>) |
| and benchmarks (<code class="docutils literal notranslate"><span class="pre">--benchmark-filter</span></code>), both options supports regular |
| expressions.</p> |
| <div class="highlight-shell notranslate"><div class="highlight"><pre><span></span><span class="c1"># Taking over a previous run, but only filtering for benchmarks matching</span> |
| <span class="c1"># `Kernel` and suite matching `compute-aggregate`.</span> |
| archery<span class="w"> </span>benchmark<span class="w"> </span>diff<span class="w"> </span><span class="se">\</span> |
| <span class="w"> </span>--suite-filter<span class="o">=</span>compute-aggregate<span class="w"> </span>--benchmark-filter<span class="o">=</span>Kernel<span class="w"> </span><span class="se">\</span> |
| <span class="w"> </span>/tmp/arrow-bench*/<span class="o">{</span>WORKSPACE,master<span class="o">}</span>/build |
| </pre></div> |
| </div> |
| <p>Instead of rerunning benchmarks on comparison, a JSON file (generated by |
| <code class="docutils literal notranslate"><span class="pre">archery</span> <span class="pre">benchmark</span> <span class="pre">run</span></code>) may be specified for the contender and/or the |
| baseline.</p> |
| <div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>archery<span class="w"> </span>benchmark<span class="w"> </span>run<span class="w"> </span>--output<span class="o">=</span>baseline.json<span class="w"> </span><span class="nv">$HOME</span>/arrow/cpp/release-build |
| git<span class="w"> </span>checkout<span class="w"> </span>some-feature |
| archery<span class="w"> </span>benchmark<span class="w"> </span>run<span class="w"> </span>--output<span class="o">=</span>contender.json<span class="w"> </span><span class="nv">$HOME</span>/arrow/cpp/release-build |
| archery<span class="w"> </span>benchmark<span class="w"> </span>diff<span class="w"> </span>contender.json<span class="w"> </span>baseline.json |
| </pre></div> |
| </div> |
| </section> |
| </section> |
| <section id="regression-detection"> |
| <h2>Regression detection<a class="headerlink" href="#regression-detection" title="Permalink to this heading">#</a></h2> |
| <section id="writing-a-benchmark"> |
| <h3>Writing a benchmark<a class="headerlink" href="#writing-a-benchmark" title="Permalink to this heading">#</a></h3> |
| <ol class="arabic simple"> |
| <li><p>The benchmark command will filter (by default) benchmarks with the regular |
| expression <code class="docutils literal notranslate"><span class="pre">^Regression</span></code>. This way, not all benchmarks are run by default. |
| Thus, if you want your benchmark to be verified for regression |
| automatically, the name must match.</p></li> |
| <li><p>The benchmark command will run with the <code class="docutils literal notranslate"><span class="pre">--benchmark_repetitions=K</span></code> |
| options for statistical significance. Thus, a benchmark should not override |
| the repetitions in the (C++) benchmark’s arguments definition.</p></li> |
| <li><p>Due to #2, a benchmark should run sufficiently fast. Often, when the input |
| does not fit in memory (L2/L3), the benchmark will be memory bound instead |
| of CPU bound. In this case, the input can be downsized.</p></li> |
| <li><p>By default, google’s benchmark library will use the cputime metric, which |
| is the sum of runtime dedicated on the CPU for all threads of the process. |
| By contrast to realtime which is the wall clock time, e.g. the difference |
| between end_time - start_time. In a single thread model, the cputime is |
| preferable since it is less affected by context switching. In a multi thread |
| scenario, the cputime will give incorrect result since the since it’ll |
| be inflated by the number of threads and can be far off realtime. Thus, if |
| the benchmark is multi threaded, it might be better to use |
| <code class="docutils literal notranslate"><span class="pre">SetRealtime()</span></code>, see this <a class="reference external" href="https://github.com/apache/arrow/blob/a9582ea6ab2db055656809a2c579165fe6a811ba/cpp/src/arrow/io/memory-benchmark.cc#L223-L227">example</a>.</p></li> |
| </ol> |
| </section> |
| </section> |
| <section id="scripting"> |
| <h2>Scripting<a class="headerlink" href="#scripting" title="Permalink to this heading">#</a></h2> |
| <p><code class="docutils literal notranslate"><span class="pre">archery</span></code> is written as a python library with a command line frontend. The |
| library can be imported to automate some tasks.</p> |
| <p>Some invocation of the command line interface can be quite verbose due to build |
| output. This can be controlled/avoided with the <code class="docutils literal notranslate"><span class="pre">--quiet</span></code> option or the |
| <code class="docutils literal notranslate"><span class="pre">--output=<file></span></code> can be used, e.g.</p> |
| <div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>archery<span class="w"> </span>benchmark<span class="w"> </span>diff<span class="w"> </span>--benchmark-filter<span class="o">=</span>Kernel<span class="w"> </span>--output<span class="o">=</span>compare.json<span class="w"> </span>... |
| </pre></div> |
| </div> |
| </section> |
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