<
body>
<
div class=
"content">
<
h1 class=
'title'>checkasm performance measurements</
h1>
<
p class=
"no-print"><
a href=
"#grokularation">want to understand this report?</
a></
p>
<
h1 id=
"overview"><
a href=
"#overview">overview</
a></
h1>
<
div class=
"no-print">
<
button id=
"toggleOverview">Collapse All</
button>
<
span class=
"overview-info">
<
select id=
"sort-overview" class=
"select">
<
option value=
"report-index">index</
option>
<
option value=
"lex">name</
option>
<
option value=
"colex">suffix</
option>
<
option value=
"duration">
time ascending</
option>
<
option value=
"rev-duration">
time descending</
option>
</
select>
<
a href=
"#controls-explanation" class=
"info" title=
"click bar/label to zoom; x-axis to toggle logarithmic scale; background to reset">
9432;</
a>
<
a id=
"legend-toggle" class=
"chevron button"></
a>
</
span>
</
div>
<
aside id=
"overview-charts"></
aside>
<main id=
"reports"></main>
</
div>
<
aside id=
"controls-explanation" class=
"explanation no-print">
<
h1><
a href=
"#controls-explanation">controls</
a></
h1>
<
p>
The overview chart can be controlled by clicking the following elements:
<
ul>
<
li><
em>
a bar or its
label</
em> zooms the x-axis to that bar</
li>
<
li><
em>the background</
em> resets zoom to the entire chart</
li>
<
li><
em>the x-axis</
em> toggles between linear and logarithmic scale</
li>
<
li><
em>the chevron</
em> in the top-right toggles the the
legend</
li>
<
li><
em>
a group name in the
legend</
em> shows/hides that group</
li>
</
ul>
</
p>
</
aside>
<
aside id=
"grokularation" class=
"explanation">
<
h1><
a href=
"#grokularation">understanding this report</
a></
h1>
<
p>
In this report, each function benchmarked by checkasm is assigned
a section of its own.
<
span class=
"no-print">The charts in each
section are active; if you hover your mouse over data p
oints and annotations, you will see more details.</span>
</p>
<ul>
<li>
The chart on the left is a <a href="http://en.wikipedia.org/wiki/Kernel_density_estimation">kernel density estimate</a> (also known as a KDE) of time measurements.
This graphs the probability of any given time measurement occurring. This function is estimated from a <a href="https://en.wikipedia.org/wiki/Log-normal_distribution">Log-normal
distribution</a> fitted to the measurement data. The peak corresponds to the most likely execution time (point estimate).
</li>
<li>
The chart on the right is the raw data from which the kernel density estimate is built.
The <em>x</em>-axis indicates the number of loop iterations, while the <em>y</em>-axis shows measured execution time for the given number of loop iterations.
The line behind the values is the linear regression estimate of execution time for a given number of iterations.
Ideally, all measurements will be on (or very near) this line.
The transparent area behind it shows the 95% confidence interval for the execution time estimate.
Note that, for technical reasons, when <code>bench_run()</code> is called multiple times in the same
function, only the last call's measurements are shown in this chart.
</li>
</ul>
<p>
Under the charts is a small table. They show the results of a log-space linear regression
run on the measurements displayed in the right-hand chart.
</p>
<ul>
<li>
<em>Adjusted cycles</em> is the estimated number of CPU cycles taken by a single function
call, after subtracting the overhead of the measurement loop and function call itself.
</li>
<li>
<em>Adjusted time</em> is the estimated time taken by a single function call, after
normalization by the estimated hardware timer tick frequency, and includes extra variance
from the uncertainty of the tick rate estimation.
</li>
<li>
<em>Raw cycles</em> and <em>Raw time</em> reflect the raw data collected from the underlying
hardware counter, before subtracting the measurement overhead.
</li>
</ul>
</aside>
<footer>
<div class="content">
<h1 class="colophon-header">colophon</h1>
<p>
This report was created using the <a id="checkasm-version" href="https://code.videolan.org/videolan/checkasm">checkasm</a>
assembly testing and performance analysis tool. The data analysis and report template was copied from
the <a href=" http://hackage.haskell.org/package/criterion">Haskell criterion</a> library.
</p>
</div>
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