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bpo-38061: subprocess uses closefrom() on FreeBSD by vstinner · Pull Request #19697 · python/cpython

vstinner

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

koobs

CuriousLearner added a commit to CuriousLearner/cpython that referenced this pull request

Apr 27, 2020 
* 'master' of github.com:python/cpython: (2949 commits)
  Add files in tests/test_peg_generator to the install target lists (pythonGH-19723)
  bpo-40398: Fix typing.get_args() for special generic aliases. (pythonGH-19720)
  bpo-40348: Fix typos in the programming FAQ (pythonGH-19729)
  bpo-38387: Formally document PyDoc_STRVAR and PyDoc_STR macros (pythonGH-16607)
  bpo-40401: Remove duplicate pyhash.h include from pythoncore.vcxproj (pythonGH-19725)
  bpo-40387: Improve queue join() example. (pythonGH-19724)
  bpo-40396: Support GenericAlias in the typing functions. (pythonGH-19718)
  Fix typo in Lib/typing.py (pythonGH-19717)
  Fix typo in object.__format__ docs (pythonGH-19504)
  bpo-40275: Avoid importing logging in test.support (pythonGH-19601)
  bpo-40275: Avoid importing socket in test.support (pythonGH-19603)
  bpo-40275: Avoid importing asyncio in test.support (pythonGH-19600)
  bpo-40279: Add some error-handling to the module initialisation docs example (pythonGH-19705)
  closes bpo-40385: Remove Tools/scripts/checkpyc.py (pythonGH-19709)
  bpo-40334: Add What's New sections for PEP 617 and PEP 585 (pythonGH-19704)
  bpo-40340: Separate examples more clearly in the programming FAQ (pythonGH-19688)
  bpo-40360: Deprecate lib2to3 module in light of PEP 617 (pythonGH-19663)
  bpo-40334: Rewrite test_c_parser to avoid memory leaks (pythonGH-19694)
  bpo-38061: subprocess uses closefrom() on FreeBSD (pythonGH-19697)
  bpo-38061: os.closerange() uses closefrom() on FreeBSD (pythonGH-19696)
  ...