Blog posts for tags/release

  1. Windows wheels available in psutil 2.1.2

    psutil 2.1.2 is out. This release has been cooking for a while now, and that's because I've been travelling for the past 3 months between Spain, Japan and Germany. Hopefully I will be staying in Berlin for a while now, so I will have more time to dedicate to the project. The main new "feature" of this release is that other than the exe files, Windows users can now also benefit from Python wheels (full story is here) which are available on PYPI. Frankly I don't know much about the new wheels packaging system but long story short is that Windows users can now install psutil via pip and therefore also include it as a dependency in requirements.txt. Other than this 2.1.2 can basically be considered a bug-fix release, including some important fixes amongst which:

    • #506: restored Python 2.4 compatibility
    • #340: Process.get_open_files() no longer hangs on Windows (this was a very old and high-priority issue)
    • #501: disk_io_counters() may return negative values on Windows
    • #504: (Linux) couldn't build RPM packages via setup.py

    The list of all fixes can be found here. For the next release I plan to drop support for Python 2.4 and 2.5 and hopefully add network interfaces information similarly to ifconfig.

  2. Announcing psutil 2.0

    psutil 2.0 is out. This is a major rewrite and reorganization of both the Python and C extension modules. It costed me four months of work and more than 22,000 lines (the diff against old 1.2.1). Many of the changes are not backward compatible; I'm sure this will cause some pain, but I think it's for the better and needed to be done.

    API changes

    I already wrote a detailed blog post about this, so use that as the official reference on how to port your code.

    RST documentation

    I've never been happy with the old doc hosted on Google Code. The markup language provided by Google is pretty limited, plus it's not under revision control. The new doc is more detailed, uses reStructuredText as the markup language, lives in the same code repository as psutil, and is hosted on the excellent Read the Docs: http://psutil.readthedocs.org/

    Physical CPUs count

    You're now able to distinguish between logical and physical CPUs. The full story is in #427.

    >>> psutil.cpu_count()  # logical
4
>>> psutil.cpu_count(logical=False)  # physical cores only
2

    Process instances are hashable

    psutil.Process instances can now be compared for equality and used in sets and dicts. The most useful application is diffing process snapshots:

    >>> before = set(psutil.process_iter())
>>> # ... some time passes ...
>>> after = set(psutil.process_iter())
>>> new_procs = after - before  # processes spawned in between

    Equality is not just PID-based. It also includes the process creation time, so a Process whose PID got reused by the kernel won't be mistaken for the original. The full story is in #452.

    Speedups

    • #477: Process.cpu_percent() is about 30% faster.
    • #478: (Linux) almost all APIs are about 30% faster on Python 3.X.

    Other improvements and bugfixes

    • #424: published Windows installers for Python 3.X 64-bit.
    • #447: the psutil.wait_procs() timeout parameter is now optional.
    • #459: a Makefile is now available for running tests and other repetitive tasks (also on Windows).
    • #463: the timeout parameter of cpu_percent* functions defaults to 0.0, because the previous default was a common source of slowdowns.
    • #340: (Windows) Process.open_files() no longer hangs.
    • #448: (Windows) fixed a memory leak affecting Process.children() and Process.ppid().
    • #461: namedtuples are now pickle-able.
    • #474: (Windows) Process.cpu_percent() is no longer capped at 100%.

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