Delete recommendations to mount fdescfs #39
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asomers
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fdescfs used to be useful to help Python more quickly close file descriptors before exec(). But for years, Python has been using closefrom() instead. All versions of Python 3.9 and later do that. Fixes freebsd#39
dgeo
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Oct 14, 2024
fdescfs used to be useful to help Python more quickly close file descriptors before exec(). But for years, Python has been using closefrom() instead. All versions of Python 3.9 and later do that. Fixes #39
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iocage recommends the user to mount fdescfs if it isn't already mounted. AFAIK, this is due to a Python performance bug. It used to be that when Python exec'd a new process, it would iterate through all possible file descriptors, closing each one, before calling exec. That can take a very long time with high ulimit -n. Then Python learned to look in fdescfs to see how many file descriptors were actually open. Big improvement. But still a hack. Now, Python will use the closefrom syscall to close all file descriptors at once. Best solution! Since all currently supported versions of Python have that change, iocage should remove the recommendation to mount fdescfs.
freebsd/freebsd-ports@e4c2b30 applied the patch to FreeBSD's Python packages, and
python/cpython@162c567 applied the patch to the main Python repository.
If you use FreeBSD's Python packages, the minimum versions containing the fix are 3.8.1_2, 3.7.5_1, 3.6.9_1, 3.5.9_3, or 2.7.17_1
Original issue: iocage/iocage#1234
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