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class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><button type="button" id="help-button" title="help">?</button><a id="settings-menu" href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></form></nav></div><section id="main-content" class="content"><div class="example-wrap"><pre class="line-numbers"><span id="1">1</span> <span id="2">2</span> <span id="3">3</span> <span id="4">4</span> <span id="5">5</span> <span id="6">6</span> <span id="7">7</span> <span id="8">8</span> <span id="9">9</span> <span id="10">10</span> <span id="11">11</span> <span id="12">12</span> <span id="13">13</span> <span id="14">14</span> <span id="15">15</span> <span id="16">16</span> <span id="17">17</span> <span id="18">18</span> <span id="19">19</span> <span id="20">20</span> <span 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id="179">179</span> <span id="180">180</span> <span id="181">181</span> <span id="182">182</span> <span id="183">183</span> <span id="184">184</span> <span id="185">185</span> <span id="186">186</span> <span id="187">187</span> <span id="188">188</span> <span id="189">189</span> <span id="190">190</span> <span id="191">191</span> <span id="192">192</span> <span id="193">193</span> <span id="194">194</span> <span id="195">195</span> <span id="196">196</span> <span id="197">197</span> <span id="198">198</span> <span id="199">199</span> <span id="200">200</span> </pre><pre class="rust"><code><span class="kw">use</span> <span class="ident">std::convert::TryFrom</span>; <span class="kw">use</span> <span class="ident">serde</span>::{<span class="ident">Deserialize</span>, <span class="ident">Serialize</span>}; <span class="kw">use</span> <span class="kw">crate</span>::{<span class="ident">Distance</span>, <span class="ident">Duration</span>}; <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Copy</span>, <span class="ident">PartialEq</span>, <span class="ident">Eq</span>, <span class="ident">PartialOrd</span>, <span class="ident">Ord</span>, <span class="ident">Serialize</span>, <span class="ident">Deserialize</span>)]</span> <span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">Statistic</span> { <span class="ident">Min</span>, <span class="ident">Mean</span>, <span class="ident">P50</span>, <span class="ident">P90</span>, <span class="ident">P99</span>, <span class="ident">Max</span>, } <span class="kw">impl</span> <span class="ident">Statistic</span> { <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">all</span>() -> <span class="ident">Vec</span><span class="op"><</span><span class="ident">Statistic</span><span class="op">></span> { <span class="macro">vec!</span>[ <span class="ident">Statistic::Min</span>, <span class="ident">Statistic::Mean</span>, <span class="ident">Statistic::P50</span>, <span class="ident">Statistic::P90</span>, <span class="ident">Statistic::P99</span>, <span class="ident">Statistic::Max</span>, ] } } <span class="kw">impl</span> <span class="ident">std::fmt::Display</span> <span class="kw">for</span> <span class="ident">Statistic</span> { <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&mut</span> <span class="ident">std::fmt::Formatter</span>) -> <span class="ident">std::fmt::Result</span> { <span class="kw">match</span> <span class="self">self</span> { <span class="ident">Statistic::Min</span> => <span class="macro">write!</span>(<span class="ident">f</span>, <span class="string">"minimum"</span>), <span class="ident">Statistic::Mean</span> => <span class="macro">write!</span>(<span class="ident">f</span>, <span class="string">"mean"</span>), <span class="ident">Statistic::P50</span> => <span class="macro">write!</span>(<span class="ident">f</span>, <span class="string">"50%ile"</span>), <span class="ident">Statistic::P90</span> => <span class="macro">write!</span>(<span class="ident">f</span>, <span class="string">"90%ile"</span>), <span class="ident">Statistic::P99</span> => <span class="macro">write!</span>(<span class="ident">f</span>, <span class="string">"99%ile"</span>), <span class="ident">Statistic::Max</span> => <span class="macro">write!</span>(<span class="ident">f</span>, <span class="string">"maximum"</span>), } } } <span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">HgramValue</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>: <span class="ident">Copy</span> <span class="op">+</span> <span class="ident">std::cmp::Ord</span> <span class="op">+</span> <span class="ident">std::fmt::Display</span> { <span class="comment">// TODO Weird name because I can't figure out associated type mess in FanChart</span> <span class="kw">fn</span> <span class="ident">hgram_zero</span>() -> <span class="ident">T</span>; <span class="kw">fn</span> <span class="ident">to_u64</span>(<span class="self">self</span>) -> <span class="ident">u64</span>; <span class="kw">fn</span> <span class="ident">from_u64</span>(<span class="ident">x</span>: <span class="ident">u64</span>) -> <span class="ident">T</span>; } <span class="kw">impl</span> <span class="ident">HgramValue</span><span class="op"><</span><span class="ident">Duration</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Duration</span> { <span class="kw">fn</span> <span class="ident">hgram_zero</span>() -> <span class="ident">Duration</span> { <span class="ident">Duration::ZERO</span> } <span class="kw">fn</span> <span class="ident">to_u64</span>(<span class="self">self</span>) -> <span class="ident">u64</span> { <span class="self">self</span>.<span class="ident">to_u64</span>() } <span class="kw">fn</span> <span class="ident">from_u64</span>(<span class="ident">x</span>: <span class="ident">u64</span>) -> <span class="ident">Duration</span> { <span class="ident">Duration::from_u64</span>(<span class="ident">x</span>) } } <span class="kw">impl</span> <span class="ident">HgramValue</span><span class="op"><</span><span class="ident">Distance</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Distance</span> { <span class="kw">fn</span> <span class="ident">hgram_zero</span>() -> <span class="ident">Distance</span> { <span class="ident">Distance::ZERO</span> } <span class="kw">fn</span> <span class="ident">to_u64</span>(<span class="self">self</span>) -> <span class="ident">u64</span> { <span class="self">self</span>.<span class="ident">to_u64</span>() } <span class="kw">fn</span> <span class="ident">from_u64</span>(<span class="ident">x</span>: <span class="ident">u64</span>) -> <span class="ident">Distance</span> { <span class="ident">Distance::from_u64</span>(<span class="ident">x</span>) } } <span class="kw">impl</span> <span class="ident">HgramValue</span><span class="op"><</span><span class="ident">u16</span><span class="op">></span> <span class="kw">for</span> <span class="ident">u16</span> { <span class="kw">fn</span> <span class="ident">hgram_zero</span>() -> <span class="ident">u16</span> { <span class="number">0</span> } <span class="kw">fn</span> <span class="ident">to_u64</span>(<span class="self">self</span>) -> <span class="ident">u64</span> { <span class="self">self</span> <span class="kw">as</span> <span class="ident">u64</span> } <span class="kw">fn</span> <span class="ident">from_u64</span>(<span class="ident">x</span>: <span class="ident">u64</span>) -> <span class="ident">u16</span> { <span class="ident">u16::try_from</span>(<span class="ident">x</span>).<span class="ident">unwrap</span>() } } <span class="kw">impl</span> <span class="ident">HgramValue</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> <span class="kw">for</span> <span class="ident">usize</span> { <span class="kw">fn</span> <span class="ident">hgram_zero</span>() -> <span class="ident">usize</span> { <span class="number">0</span> } <span class="kw">fn</span> <span class="ident">to_u64</span>(<span class="self">self</span>) -> <span class="ident">u64</span> { <span class="self">self</span> <span class="kw">as</span> <span class="ident">u64</span> } <span class="kw">fn</span> <span class="ident">from_u64</span>(<span class="ident">x</span>: <span class="ident">u64</span>) -> <span class="ident">usize</span> { <span class="ident">x</span> <span class="kw">as</span> <span class="ident">usize</span> } } <span class="comment">// TODO Maybe consider having a type-safe NonEmptyHistogram.</span> <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>)]</span> <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Histogram</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">HgramValue</span><span class="op"><</span><span class="ident">T</span><span class="op">></span><span class="op">></span> { <span class="ident">count</span>: <span class="ident">usize</span>, <span class="ident">histogram</span>: <span class="ident">histogram::Histogram</span>, <span class="ident">min</span>: <span class="ident">T</span>, <span class="ident">max</span>: <span class="ident">T</span>, } <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">HgramValue</span><span class="op"><</span><span class="ident">T</span><span class="op">></span><span class="op">></span> <span class="ident">Default</span> <span class="kw">for</span> <span class="ident">Histogram</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">default</span>() -> <span class="ident">Histogram</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="ident">Histogram</span> { <span class="ident">count</span>: <span class="number">0</span>, <span class="ident">histogram</span>: <span class="ident">Default::default</span>(), <span class="ident">min</span>: <span class="ident">T::hgram_zero</span>(), <span class="ident">max</span>: <span class="ident">T::hgram_zero</span>(), } } } <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">HgramValue</span><span class="op"><</span><span class="ident">T</span><span class="op">></span><span class="op">></span> <span class="ident">Histogram</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>() -> <span class="ident">Histogram</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="ident">Default::default</span>() } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">add</span>(<span class="kw-2">&mut</span> <span class="self">self</span>, <span class="ident">x</span>: <span class="ident">T</span>) { <span class="kw">if</span> <span class="self">self</span>.<span class="ident">count</span> <span class="op">==</span> <span class="number">0</span> { <span class="self">self</span>.<span class="ident">min</span> <span class="op">=</span> <span class="ident">x</span>; <span class="self">self</span>.<span class="ident">max</span> <span class="op">=</span> <span class="ident">x</span>; } <span class="kw">else</span> { <span class="self">self</span>.<span class="ident">min</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">min</span>.<span class="ident">min</span>(<span class="ident">x</span>); <span class="self">self</span>.<span class="ident">max</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">max</span>.<span class="ident">max</span>(<span class="ident">x</span>); } <span class="self">self</span>.<span class="ident">count</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>; <span class="self">self</span>.<span class="ident">histogram</span> .<span class="ident">increment</span>(<span class="ident">x</span>.<span class="ident">to_u64</span>()) .<span class="ident">map_err</span>(<span class="op">|</span><span class="ident">err</span><span class="op">|</span> <span class="macro">format!</span>(<span class="string">"Can't add {}: {}"</span>, <span class="ident">x</span>, <span class="ident">err</span>)) .<span class="ident">unwrap</span>(); } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">remove</span>(<span class="kw-2">&mut</span> <span class="self">self</span>, <span class="ident">x</span>: <span class="ident">T</span>) { <span class="comment">// TODO This doesn't update min/max! Why are we tracking that ourselves? Do we not trust</span> <span class="comment">// the lossiness of the underlying histogram?</span> <span class="self">self</span>.<span class="ident">count</span> <span class="op">-</span><span class="op">=</span> <span class="number">1</span>; <span class="self">self</span>.<span class="ident">histogram</span> .<span class="ident">decrement</span>(<span class="ident">x</span>.<span class="ident">to_u64</span>()) .<span class="ident">map_err</span>(<span class="op">|</span><span class="ident">err</span><span class="op">|</span> <span class="macro">format!</span>(<span class="string">"Can't remove {}: {}"</span>, <span class="ident">x</span>, <span class="ident">err</span>)) .<span class="ident">unwrap</span>(); } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">describe</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="ident">String</span> { <span class="kw">if</span> <span class="self">self</span>.<span class="ident">count</span> <span class="op">==</span> <span class="number">0</span> { <span class="kw">return</span> <span class="string">"no data yet"</span>.<span class="ident">to_string</span>(); } <span class="macro">format!</span>( <span class="string">"{} count, 50%ile {}, 90%ile {}, 99%ile {}, min {}, mean {}, max {}"</span>, <span class="ident">abstutil::prettyprint_usize</span>(<span class="self">self</span>.<span class="ident">count</span>), <span class="self">self</span>.<span class="ident">select</span>(<span class="ident">Statistic::P50</span>).<span class="ident">unwrap</span>(), <span class="self">self</span>.<span class="ident">select</span>(<span class="ident">Statistic::P90</span>).<span class="ident">unwrap</span>(), <span class="self">self</span>.<span class="ident">select</span>(<span class="ident">Statistic::P99</span>).<span class="ident">unwrap</span>(), <span class="self">self</span>.<span class="ident">select</span>(<span class="ident">Statistic::Min</span>).<span class="ident">unwrap</span>(), <span class="self">self</span>.<span class="ident">select</span>(<span class="ident">Statistic::Mean</span>).<span class="ident">unwrap</span>(), <span class="self">self</span>.<span class="ident">select</span>(<span class="ident">Statistic::Max</span>).<span class="ident">unwrap</span>(), ) } <span class="doccomment">/// None if empty</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">percentile</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">p</span>: <span class="ident">f64</span>) -> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="kw">if</span> <span class="self">self</span>.<span class="ident">count</span> <span class="op">==</span> <span class="number">0</span> { <span class="kw">return</span> <span class="prelude-val">None</span>; } <span class="prelude-val">Some</span>(<span class="ident">T::from_u64</span>(<span class="self">self</span>.<span class="ident">histogram</span>.<span class="ident">percentile</span>(<span class="ident">p</span>).<span class="ident">unwrap</span>())) } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">select</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">stat</span>: <span class="ident">Statistic</span>) -> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="kw">if</span> <span class="self">self</span>.<span class="ident">count</span> <span class="op">==</span> <span class="number">0</span> { <span class="kw">return</span> <span class="prelude-val">None</span>; } <span class="kw">let</span> <span class="ident">raw</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">stat</span> { <span class="ident">Statistic::P50</span> => <span class="self">self</span>.<span class="ident">histogram</span>.<span class="ident">percentile</span>(<span class="number">50.0</span>).<span class="ident">unwrap</span>(), <span class="ident">Statistic::P90</span> => <span class="self">self</span>.<span class="ident">histogram</span>.<span class="ident">percentile</span>(<span class="number">90.0</span>).<span class="ident">unwrap</span>(), <span class="ident">Statistic::P99</span> => <span class="self">self</span>.<span class="ident">histogram</span>.<span class="ident">percentile</span>(<span class="number">99.0</span>).<span class="ident">unwrap</span>(), <span class="ident">Statistic::Min</span> => { <span class="kw">return</span> <span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">min</span>); } <span class="ident">Statistic::Mean</span> => <span class="self">self</span>.<span class="ident">histogram</span>.<span class="ident">mean</span>().<span class="ident">unwrap</span>(), <span class="ident">Statistic::Max</span> => { <span class="kw">return</span> <span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">max</span>); } }; <span class="prelude-val">Some</span>(<span class="ident">T::from_u64</span>(<span class="ident">raw</span>)) } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">count</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="ident">usize</span> { <span class="self">self</span>.<span class="ident">count</span> } <span class="doccomment">/// Could implement PartialEq, but be a bit more clear how approximate this is</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">seems_eq</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">Histogram</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>) -> <span class="ident">bool</span> { <span class="self">self</span>.<span class="ident">describe</span>() <span class="op">==</span> <span class="ident">other</span>.<span class="ident">describe</span>() } } </code></pre></div> </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="geom" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.62.1 (e092d0b6b 2022-07-16)" ></div> </body></html>