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bpo-41586: Add pipesize parameter to subprocess & F_GETPIPE_SZ and F_…
…SETPIPE_SZ to fcntl. (GH-21921) * Add F_SETPIPE_SZ and F_GETPIPE_SZ to fcntl module * Add pipesize parameter for subprocess.Popen class This will allow the user to control the size of the pipes. On linux the default is 64K. When a pipe is full it blocks for writing. When a pipe is empty it blocks for reading. On processes that are very fast this can lead to a lot of wasted CPU cycles. On a typical Linux system the max pipe size is 1024K which is much better. For high performance-oriented libraries such as xopen it is nice to be able to set the pipe size. The workaround without this feature is to use my_popen_process.stdout.fileno() in conjuction with fcntl and 1031 (value of F_SETPIPE_SZ) to acquire this behavior.
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Misc/NEWS.d/next/Library/2020-08-19-08-32-13.bpo-41586.IYjmjK.rst
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Add F_SETPIPE_SZ and F_GETPIPE_SZ to fcntl module. Allow setting pipesize on | ||
subprocess.Popen. |
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