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<h2>About the Python Speed Center</h2>

<p>The <a href="https://speed.python.org/">Python Speed Center</a>

is the public performance dashboard for <a href="https://www.python.org/">CPython</a>.

Every night it builds the current development branch and the maintenance

branches from source, runs the <a href="https://github.com/python/pyperformance">pyperformance</a>

benchmark suite on dedicated hardware, and records the results here so that

anyone can see how the interpreter's speed changes commit by commit.</p>

<h2>Executables and machines</h2>

<p>On this site an <em>executable</em> is a particular way of building

CPython and an <em>environment</em> is the machine it ran on. The names below

are the ones that can be selected in the sidebars.</p>

<table class="about-table">

<thead>

<tr><th>Environment</th><th>Machine</th><th>Results</th></tr>

</thead>

<tbody>

<tr>

<td><code>speed-python</code></td>

<td>x86-64: <a href="#machine-x86">HP ProLiant DL380 G7</a> at OSUOSL</td>

<td>October 2021 to present</td>

</tr>

<tr>

<td><code>ampere-one</code></td>

<td>AArch64: <a href="#machine-aarch64">Ampere One server</a> hosted by Arm</td>

<td>August 2025 to present</td>

</tr>

<tr class="retired">

<td><code>arm-neoverse</code></td>

<td>AArch64: the previous Arm Neoverse machine, replaced by

<code>ampere-one</code></td>

<td>May 2023 to August 2025</td>

</tr>

<tr class="retired">

<td><code>bb-benchmark-machine</code></td>

<td>A separate, short-lived benchmark worker</td>

<td>October 2021 to March 2023</td>

</tr>

<tr class="retired">

<td><code>speed-python-historical</code></td>

<td>Results from before the current <code>speed-python</code>

environment was set up, kept for reference</td>

<td>November 2020 to October 2021</td>

</tr>

</tbody>

<p>Retired environments no longer receive results but are kept so that old

data stays reachable through the Timeline and Comparison pages.</p>

<h3 id="machine-x86">The x86-64 machine (<code>speed-python</code>)</h3>

<p>Nicknamed "the beast", this server was donated to the Python Software

Foundation by the HP Open Source Program Office in 2011. The acquisition was

announced on

<a href="https://web.archive.org/web/20170824021111/http://jessenoller.com/2011/06/29/announcing-the-new-speed-python-org-machine/">Jesse

Noller's blog</a>.</p>

<li>HP ProLiant DL380 G7 (2U)</li>

<li>2&times; Intel Xeon X5680, 3.33&nbsp;GHz, 6 cores each, 12&nbsp;MB cache</li>

<li>16&nbsp;GB RAM (4&times; 4&nbsp;GB DDR3-1333 registered, dual rank)</li>

<li>4&times; 300&nbsp;GB 15k rpm SAS drives on an HP Smart Array P410i

controller with 1&nbsp;GB flash-backed write cache, hardware RAID with a

simple LVM layout</li>

<li>Dual HP NC382i dual-port gigabit adapters, redundant 750&nbsp;W power

supplies, iLO Advanced</li>

<li>Ubuntu 18.04 LTS</li>

<p>Racking, hardware administration and all bandwidth are donated by the

<a href="https://osuosl.org/">Oregon State University Open Source Lab</a>

(OSUOSL), long-standing supporters of open source and of the PSF. We are very

grateful to both HP and OSUOSL.</p>

<h3 id="machine-aarch64">The AArch64 machine (<code>ampere-one</code>)</h3>

<p>This server was donated to the PSF by <a href="https://www.arm.com/">Arm

Ltd</a>, who also host it.</p>

<li>Ampere One, 192 cores, 64-bit Armv8.6+, 3.6&nbsp;GHz</li>

<li>Per core: 2&nbsp;MB L2, 16&nbsp;KB L1 instruction cache, 64&nbsp;KB L1

data cache</li>

<li>512&nbsp;GB RAM (8&times; 64&nbsp;GB DDR5-5200 registered)</li>

<li>1.7&nbsp;TB and 3.5&nbsp;TB NVMe drives</li>

<li>2&times; 10&nbsp;Gbps networking</li>

<li>Ubuntu 24.04 LTS, managed through the

<a href="https://github.com/python/psf-salt">PSF Salt infrastructure</a>;

<a href="https://github.com/diegorusso">Diego Russo</a> has serial console

access</li>

<p>We cannot thank Arm enough for the hardware, the hosting and the

administration.</p>

<h2>History</h2>

<p>The Speed Center started as a shared project between the CPython, PyPy,

IronPython and Jython teams. At the PyCon 2011 VM and language summits the

maintainers of the major implementations agreed to move to a common benchmark

suite and a single performance-oriented site, modelled on the PyPy team's

<code>speed.pypy.org</code> and using the Codespeed software they had adopted. HP donated

the first machine the same year. Today the site focuses on CPython, results

for PyPy can be found on <a href="https://speed.pypy.org/">speed.pypy.org</a>.</p>

<h2>Software</h2>

<p>This site runs on <a href="https://github.com/tobami/codespeed">Codespeed</a>,

a Django application for tracking and analysing the performance of a code

base over time. The Speed Center's own fork, including the templates and

styling you are looking at, is maintained at

<a href="https://github.com/python/codespeed">python/codespeed</a>{% if commit %},

currently at commit <a href="https://github.com/python/codespeed/commit/{{ commit }}"><code>{{ commit|slice:":12" }}</code></a>{% endif %}.</p>

<h2>Contact</h2>

<p>Questions, problems and suggestions about this site are welcome in the

<a href="https://discuss.python.org/c/core-dev/23">Core Development</a>

category on discuss.python.org. Problems with the site's code can be reported

on the <a href="https://github.com/python/codespeed/issues">python/codespeed

issue tracker</a>, and problems with the benchmarks themselves on the

<a href="https://github.com/python/pyperformance/issues">pyperformance

tracker</a>.</p>

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