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v0.5.1
v0.5.1
https://github.com/python/cpython
Revision 23c0fb8edd16fe6d796df2853a5369fd783e05b7 authored by Ruben Vorderman on 19 October 2020, 23:30:02 UTC, committed by GitHub on 19 October 2020, 23:30:02 UTC
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.
1 parent bf83822
Tip revision: 23c0fb8edd16fe6d796df2853a5369fd783e05b7 authored by Ruben Vorderman on 19 October 2020, 23:30:02 UTC
bpo-41586: Add pipesize parameter to subprocess & F_GETPIPE_SZ and F_SETPIPE_SZ to fcntl. (GH-21921)
bpo-41586: Add pipesize parameter to subprocess & F_GETPIPE_SZ and F_SETPIPE_SZ to fcntl. (GH-21921)
Tip revision: 23c0fb8
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| CODE_OF_CONDUCT.md | -rw-r--r-- | 630 bytes |
| LICENSE | -rw-r--r-- | 13.6 KB |
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| config.guess | -rwxr-xr-x | 43.1 KB |
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