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| author | Victor Stinner <vstinner@python.org> | 2020-04-24 10:06:58 (GMT) |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2020-04-24 10:06:58 (GMT) |
| commit | e6f8abd500751a834b6fff4f107ecbd29f2184fe (patch) | |
| tree | b6c864b0239aba840849bb4dba8a94d7b57b5b68 /Doc/whatsnew | |
| parent | 162c567d164b5742c0d1f3f8bd8c8bab9c117cd0 (diff) | |
| download | cpython-e6f8abd500751a834b6fff4f107ecbd29f2184fe.zip cpython-e6f8abd500751a834b6fff4f107ecbd29f2184fe.tar.gz cpython-e6f8abd500751a834b6fff4f107ecbd29f2184fe.tar.bz2 | |
bpo-38061: subprocess uses closefrom() on FreeBSD (GH-19697)
Optimize the subprocess module on FreeBSD using closefrom().
A single close(fd) syscall is cheap, but when sysconf(_SC_OPEN_MAX)
is high, the loop calling close(fd) on each file descriptor can take
several milliseconds.
The workaround on FreeBSD to improve performance was to load and
mount the fdescfs kernel module, but this is not enabled by default.
Initial patch by Ed Maste (emaste), Conrad Meyer (cem), Kyle Evans
(kevans) and Kubilay Kocak (koobs):
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=242274
Diffstat (limited to 'Doc/whatsnew')
| -rw-r--r-- | Doc/whatsnew/3.9.rst | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/Doc/whatsnew/3.9.rst b/Doc/whatsnew/3.9.rst index ee85170..325121d 100644 --- a/Doc/whatsnew/3.9.rst +++ b/Doc/whatsnew/3.9.rst @@ -471,6 +471,10 @@ Optimizations until the main thread handles signals. (Contributed by Victor Stinner in :issue:`40010`.) +* Optimize the :mod:`subprocess` module on FreeBSD using ``closefrom()``. + (Contributed by Ed Maste, Conrad Meyer, Kyle Evans, Kubilay Kocak and Victor + Stinner in :issue:`38061`.) + Build and C API Changes ======================= |