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<div class="section" id="h2load-http-2-benchmarking-tool-how-to">
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<h1>h2load - HTTP/2 benchmarking tool - HOW-TO<a class="headerlink" href="#h2load-http-2-benchmarking-tool-how-to" title="Permalink to this headline">¶</a></h1>
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<p>h2load is benchmarking tool for HTTP/2. If built with
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spdylay (<a class="reference external" href="http://tatsuhiro-t.github.io/spdylay/">http://tatsuhiro-t.github.io/spdylay/</a>) library, it also
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supports SPDY protocol. It supports SSL/TLS and clear text for both
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HTTP/2 and SPDY.</p>
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<div class="section" id="basic-usage">
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<h2>Basic Usage<a class="headerlink" href="#basic-usage" title="Permalink to this headline">¶</a></h2>
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<p>In order to set benchmark settings, specify following 3 options.</p>
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<dl class="docutils">
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<dt><tt class="docutils literal"><span class="pre">-n</span></tt></dt>
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<dd>The number of total requests. Default: 1</dd>
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<dt><tt class="docutils literal"><span class="pre">-c</span></tt></dt>
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<dd>The number of concurrent clients. Default: 1</dd>
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<dt><tt class="docutils literal"><span class="pre">-m</span></tt></dt>
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<dd>The max concurrent streams to issue per client.
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If <tt class="docutils literal"><span class="pre">auto</span></tt> is given, the number of given URIs is used.
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Default: <tt class="docutils literal"><span class="pre">auto</span></tt></dd>
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</dl>
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<p>Here is a command-line to perform benchmark to URI https://localhost
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using total 100000 requests, 100 concurrent clients and 10 max
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concurrent streams:</p>
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<div class="highlight-c"><div class="highlight"><pre>$ h2load -n100000 -c100 -m10 https://localhost
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</pre></div>
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</div>
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<p>The benchmarking result looks like this:</p>
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<div class="highlight-c"><div class="highlight"><pre><span class="n">finished</span> <span class="n">in</span> <span class="mi">0</span> <span class="n">sec</span><span class="p">,</span> <span class="mi">385</span> <span class="n">millisec</span> <span class="n">and</span> <span class="mi">851</span> <span class="n">microsec</span><span class="p">,</span> <span class="mi">2591</span> <span class="n">req</span><span class="o">/</span><span class="n">s</span><span class="p">,</span> <span class="mi">1689</span> <span class="n">kbytes</span><span class="o">/</span><span class="n">s</span>
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<span class="nl">requests:</span> <span class="mi">1000</span> <span class="n">total</span><span class="p">,</span> <span class="mi">1000</span> <span class="n">started</span><span class="p">,</span> <span class="mi">1000</span> <span class="n">done</span><span class="p">,</span> <span class="mi">1000</span> <span class="n">succeeded</span><span class="p">,</span> <span class="mi">0</span> <span class="n">failed</span><span class="p">,</span> <span class="mi">0</span> <span class="n">errored</span>
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<span class="n">status</span> <span class="n">codes</span><span class="o">:</span> <span class="mi">1000</span> <span class="mi">2</span><span class="n">xx</span><span class="p">,</span> <span class="mi">0</span> <span class="mi">3</span><span class="n">xx</span><span class="p">,</span> <span class="mi">0</span> <span class="mi">4</span><span class="n">xx</span><span class="p">,</span> <span class="mi">0</span> <span class="mi">5</span><span class="n">xx</span>
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<span class="nl">traffic:</span> <span class="mi">667500</span> <span class="n">bytes</span> <span class="n">total</span><span class="p">,</span> <span class="mi">28700</span> <span class="n">bytes</span> <span class="n">headers</span><span class="p">,</span> <span class="mi">612000</span> <span class="n">bytes</span> <span class="n">data</span>
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</pre></div>
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</div>
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<p>The number of <tt class="docutils literal"><span class="pre">failed</span></tt> is the number of requests returned with non
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2xx status. The number of <tt class="docutils literal"><span class="pre">error</span></tt> is the number of <tt class="docutils literal"><span class="pre">failed</span></tt> plus
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the number of requests which failed with connection error.</p>
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<p>The number of <tt class="docutils literal"><span class="pre">total</span></tt> in <tt class="docutils literal"><span class="pre">traffic</span></tt> is the received application
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data. If SSL/TLS is used, this number is calculated after decryption.
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The number of <tt class="docutils literal"><span class="pre">headers</span></tt> is the sum of payload size of response
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HEADERS (or SYN_REPLY for SPDY). This number comes before
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decompressing header block. The number of <tt class="docutils literal"><span class="pre">data</span></tt> is the sum of
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response body.</p>
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</div>
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<div class="section" id="flow-control">
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<h2>Flow Control<a class="headerlink" href="#flow-control" title="Permalink to this headline">¶</a></h2>
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<p>HTTP/2 and SPDY/3 or later employ flow control and it may affect
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benchmarking results. To adjust receiver flow control window size,
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there is following options:</p>
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<dl class="docutils">
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<dt><tt class="docutils literal"><span class="pre">-w</span></tt></dt>
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<dd>Sets the stream level initial window size to
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(2**<N>)-1. For SPDY, 2**<N> is used instead.</dd>
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<dt><tt class="docutils literal"><span class="pre">-W</span></tt></dt>
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<dd>Sets the connection level initial window size to
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(2**<N>)-1. For SPDY, if <N> is strictly less
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than 16, this option is ignored. Otherwise
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2**<N> is used for SPDY.</dd>
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</dl>
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</div>
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<div class="section" id="multi-threading">
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<h2>Multi-Threading<a class="headerlink" href="#multi-threading" title="Permalink to this headline">¶</a></h2>
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<p>Sometimes benchmarking client itself becomes a bottleneck. To remedy
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this situation, use <tt class="docutils literal"><span class="pre">-t</span></tt> option to specify the number of native
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thread to use.</p>
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<dl class="docutils">
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<dt><tt class="docutils literal"><span class="pre">-t</span></tt></dt>
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<dd>The number of native threads. Default: 1</dd>
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</dl>
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</div>
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<div class="section" id="selecting-protocol-for-clear-text">
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<h2>Selecting protocol for clear text<a class="headerlink" href="#selecting-protocol-for-clear-text" title="Permalink to this headline">¶</a></h2>
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<p>By default, if http:// URI is given, HTTP/2 protocol is used. To
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change the protocol to use for clear text, use <tt class="docutils literal"><span class="pre">-p</span></tt> option.</p>
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</div>
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<div class="section" id="multiple-uris">
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<h2>Multiple URIs<a class="headerlink" href="#multiple-uris" title="Permalink to this headline">¶</a></h2>
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<p>If multiple URIs are specified, they are used in round robin manner.</p>
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<div class="admonition note">
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<p class="first admonition-title">Note</p>
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<p class="last">Please note that h2load uses sheme, host and port in the first URI
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and ignores those parts in the rest of the URIs.</p>
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