gh-75876: Run bigmem tests in a subprocess - #155302
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serhiy-storchaka merged 4 commits intoAug 18, 2026
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A test which really allocates the memory it asks for (that is, run with -M) now runs in a subprocess, so that the memory it uses and the address space it fragments are released when it ends. A dummy run stays in the process. The parent process watches the memory usage of the subprocess while waiting for it, so the separate watchdog process is no longer needed. Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>
serhiy-storchaka
added
needs backport to 3.13
serhiy-storchaka
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August 18, 2026 07:08
serhiy-storchaka
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Thanks @serhiy-storchaka for the PR 🌮🎉.. I'm working now to backport this PR to: 3.13, 3.14, 3.15. |
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Sorry, @serhiy-storchaka, I could not cleanly backport this to |
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Sorry, @serhiy-storchaka, I could not cleanly backport this to |
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Sorry, @serhiy-storchaka, I could not cleanly backport this to |
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GH-156013 is a backport of this pull request to the 3.14 branch. |
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GH-156014 is a backport of this pull request to the 3.13 branch. |
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A test which really allocates the memory it asks for (that is, run with
-M) now runs in a subprocess, so that the memory it uses and the address space it fragments are released when it ends. A dummy run stays in the process.The parent process watches the memory usage of the subprocess while waiting for it, so
Lib/test/memory_watchdog.pyand the separate watchdog process are no longer needed._SubprocessTest.wait()calls back every second betweencommunicate()timeouts, which does not lose the subprocess output.Tested with
-M 4Gand-M 20Gon Linux, and with-M 4Gon FreeBSD and on a Windows debug build.