https://psutil.io/ 2026-07-19T17:24:11.272003+00:00 ABlog https://psutil.io/blog/2026/event-driven-process-waiting/ 2026-01-28T00:00:00+00:00 Giampaolo Rodola <p class="ablog-post-excerpt"><p>Replacing <a class="reference external" href="https://docs.python.org/3/library/subprocess.html#subprocess.Popen.wait" title="(in Python v3.14)"><code class="xref py py-meth docutils literal notranslate"><span class="pre">subprocess.Popen.wait()</span></code></a>’s busy-loop with an event-driven model, in psutil then upstream CPython</p> </p>

Replacing subprocess.Popen.wait()’s busy-loop with an event-driven model, in psutil then upstream CPython

2026-01-28T00:00:00+00:00 https://psutil.io/blog/2025/heap-introspection-apis/ 2025-12-23T00:00:00+00:00 Giampaolo Rodola <p class="ablog-post-excerpt"><p>psutil 7.2.0 peeks into the native allocator, spotting leaks <a class="reference internal" href="../glossary/#term-RSS"><span class="xref std std-term">RSS</span></a> can’t see</p> </p>

psutil 7.2.0 peeks into the native allocator, spotting leaks RSS can’t see

2025-12-23T00:00:00+00:00 https://psutil.io/blog/2025/wheels-for-free-threaded-python/ 2025-10-25T00:00:00+00:00 Giampaolo Rodola <p class="ablog-post-excerpt"><p>Unlocking <code class="docutils literal notranslate"><span class="pre">pip</span> <span class="pre">install</span> <span class="pre">psutil</span></code> for no-GIL Python</p> </p>

Unlocking pip install psutil for no-GIL Python

2025-10-25T00:00:00+00:00 https://psutil.io/blog/2025/speedup-pytest-startup/ 2025-04-04T00:00:00+00:00 Giampaolo Rodola <p class="ablog-post-excerpt"><p>Trimming heavy imports and plugins: 0.42s → 0.30s (~28%)</p> </p>

Trimming heavy imports and plugins: 0.42s → 0.30s (~28%)

2025-04-04T00:00:00+00:00 https://psutil.io/blog/2025/drop-py27/ 2025-02-13T00:00:00+00:00 Giampaolo Rodola <p class="ablog-post-excerpt"><p>Downloads fell from ~8% to 0.36% in three years; psutil 7.0.0 ends support</p> </p>

Downloads fell from ~8% to 0.36% in three years; psutil 7.0.0 ends support

2025-02-13T00:00:00+00:00 https://psutil.io/blog/2019/macos-memory-maps/ 2019-03-05T00:00:00+00:00 Giampaolo Rodola <p class="ablog-post-excerpt"><p>A segfault I couldn’t fix, and the API removal that followed</p> </p>

A segfault I couldn’t fix, and the API removal that followed

2019-03-05T00:00:00+00:00 https://psutil.io/blog/2019/announcing-560/ 2019-03-05T00:00:00+00:00 Giampaolo Rodola <p class="ablog-post-excerpt"><p>5.6.0 adds <a class="reference internal" href="../api/#psutil.Process.parents" title="psutil.Process.parents"><code class="xref py py-meth docutils literal notranslate"><span class="pre">parents()</span></code></a>, brings several Windows improvements, and removes <a class="reference internal" href="../api/#psutil.Process.memory_maps" title="psutil.Process.memory_maps"><code class="xref py py-meth docutils literal notranslate"><span class="pre">memory_maps()</span></code></a> on macOS</p> </p>

5.6.0 adds parents(), brings several Windows improvements, and removes memory_maps() on macOS

2019-03-05T00:00:00+00:00 https://psutil.io/blog/2017/aix-support/ 2017-10-12T00:00:00+00:00 Giampaolo Rodola <p class="ablog-post-excerpt"><p>psutil 5.4.0 gets an IBM port, contributed by Arnon Yaari</p> </p>

psutil 5.4.0 gets an IBM port, contributed by Arnon Yaari

2017-10-12T00:00:00+00:00 https://psutil.io/blog/2017/process-iter-attrs/ 2017-09-03T00:00:00+00:00 Giampaolo Rodola <p class="ablog-post-excerpt"><p>5.3.0 adds <code class="docutils literal notranslate"><span class="pre">attrs</span></code> and <code class="docutils literal notranslate"><span class="pre">ad_value</span></code> parameters to <a class="reference internal" href="../api/#psutil.process_iter" title="psutil.process_iter"><code class="xref py py-func docutils literal notranslate"><span class="pre">process_iter()</span></code></a>, letting you pre-fetch attributes in one shot</p> </p>

5.3.0 adds attrs and ad_value parameters to process_iter(), letting you pre-fetch attributes in one shot

2017-09-03T00:00:00+00:00 https://psutil.io/blog/2017/unicode-internals/ 2017-09-03T00:00:00+00:00 Giampaolo Rodola <p class="ablog-post-excerpt"><p>How psutil 5.3.0 got non-ASCII strings right on both Python 2 and Python 3.</p> </p>

How psutil 5.3.0 got non-ASCII strings right on both Python 2 and Python 3.

2017-09-03T00:00:00+00:00 https://psutil.io/blog/2017/sensors-support/ 2017-02-01T00:00:00+00:00 Giampaolo Rodola <p class="ablog-post-excerpt"><p>psutil 5.1.0 introduces <a class="reference internal" href="../api/#psutil.sensors_temperatures" title="psutil.sensors_temperatures"><code class="xref py py-func docutils literal notranslate"><span class="pre">sensors_temperatures()</span></code></a>, <a class="reference internal" href="../api/#psutil.sensors_battery" title="psutil.sensors_battery"><code class="xref py py-func docutils literal notranslate"><span class="pre">sensors_battery()</span></code></a> and <a class="reference internal" href="../api/#psutil.cpu_freq" title="psutil.cpu_freq"><code class="xref py py-func docutils literal notranslate"><span class="pre">cpu_freq()</span></code></a></p> </p>

psutil 5.1.0 introduces sensors_temperatures(), sensors_battery() and cpu_freq()

2017-02-01T00:00:00+00:00 https://psutil.io/blog/2016/500-is-twice-as-fast/ 2016-11-06T00:00:00+00:00 Giampaolo Rodola <p class="ablog-post-excerpt"><p>New <a class="reference internal" href="../api/#psutil.Process.oneshot" title="psutil.Process.oneshot"><code class="xref py py-meth docutils literal notranslate"><span class="pre">Process.oneshot()</span></code></a>, caching shared syscalls and halving the cost of multi-field queries</p> </p>

New Process.oneshot(), caching shared syscalls and halving the cost of multi-field queries

2016-11-06T00:00:00+00:00 https://psutil.io/blog/2016/windows-services/ 2016-05-15T00:00:00+00:00 Giampaolo Rodola <p class="ablog-post-excerpt"><p>psutil 4.2.0 introduces <a class="reference internal" href="../api/#psutil.win_service_iter" title="psutil.win_service_iter"><code class="xref py py-func docutils literal notranslate"><span class="pre">win_service_iter()</span></code></a> and <a class="reference internal" href="../api/#psutil.win_service_get" title="psutil.win_service_get"><code class="xref py py-func docutils literal notranslate"><span class="pre">win_service_get()</span></code></a></p> </p>

psutil 4.2.0 introduces win_service_iter() and win_service_get()

2016-05-15T00:00:00+00:00 https://psutil.io/blog/2016/netbsd-support/ 2016-02-25T00:00:00+00:00 Giampaolo Rodola <p class="ablog-post-excerpt"><p>Completing the BSD trio alongside FreeBSD and OpenBSD</p> </p>

Completing the BSD trio alongside FreeBSD and OpenBSD

2016-02-25T00:00:00+00:00 https://psutil.io/blog/2016/real-process-memory-in-python/ 2016-02-17T00:00:00+00:00 Giampaolo Rodola <p class="ablog-post-excerpt"><p>psutil 4.0.0 exposes <a class="reference internal" href="../glossary/#term-USS"><span class="xref std std-term">USS</span></a>, the memory that would actually be freed on process exit + <a class="reference internal" href="../api/#psutil.Process.environ" title="psutil.Process.environ"><code class="xref py py-meth docutils literal notranslate"><span class="pre">Process.environ()</span></code></a></p> </p>

psutil 4.0.0 exposes USS, the memory that would actually be freed on process exit + Process.environ()

2016-02-17T00:00:00+00:00 https://psutil.io/blog/2015/openbsd-support/ 2015-11-25T00:00:00+00:00 Giampaolo Rodola <p class="ablog-post-excerpt"><p>psutil 3.3.0 now runs on OpenBSD, sharing most of the implementation with FreeBSD</p> </p>

psutil 3.3.0 now runs on OpenBSD, sharing most of the implementation with FreeBSD

2015-11-25T00:00:00+00:00 https://psutil.io/blog/2015/reimplementing-ifconfig-in-python/ 2015-06-13T00:00:00+00:00 Giampaolo Rodola <p class="ablog-post-excerpt"><p>psutil 3.0 introduces <a class="reference internal" href="../api/#psutil.net_if_addrs" title="psutil.net_if_addrs"><code class="xref py py-func docutils literal notranslate"><span class="pre">net_if_addrs()</span></code></a> and <a class="reference internal" href="../api/#psutil.net_if_stats" title="psutil.net_if_stats"><code class="xref py py-func docutils literal notranslate"><span class="pre">net_if_stats()</span></code></a></p> </p>

psutil 3.0 introduces net_if_addrs() and net_if_stats()

2015-06-13T00:00:00+00:00 https://psutil.io/blog/2015/zombie-processes/ 2015-06-13T00:00:00+00:00 Giampaolo Rodola <p class="ablog-post-excerpt"><p>Proper handling of zombies via new <a class="reference internal" href="../api/#psutil.ZombieProcess" title="psutil.ZombieProcess"><code class="xref py py-exc docutils literal notranslate"><span class="pre">ZombieProcess</span></code></a> exception</p> </p>

Proper handling of zombies via new ZombieProcess exception

2015-06-13T00:00:00+00:00 https://psutil.io/blog/2014/announcing-20/ 2014-03-10T00:00:00+00:00 Giampaolo Rodola <p class="ablog-post-excerpt"><p>A major rewrite with breaking API changes</p> </p>

A major rewrite with breaking API changes

2014-03-10T00:00:00+00:00 https://psutil.io/blog/2014/porting-to-20/ 2014-01-11T00:00:00+00:00 Giampaolo Rodola <p class="ablog-post-excerpt"><p>A migration guide for the breaking API changes in psutil 2.0</p> </p>

A migration guide for the breaking API changes in psutil 2.0

2014-01-11T00:00:00+00:00