gh-84559: Change the multiprocessing start method default to `forkserver` by gpshead · Pull Request #101556 · python/cpython · GitHub

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gpshead:multiprocessing/default-start-method-3.14

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Pull requests 2.6k

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multiprocessing's default posix start method of 'fork' is broken: change to `'forkserver' || 'spawn' #84559

: Change the default multiprocessing start method.

awaiting core review

Merge branch 'main' into multiprocessing/default-start-method-3.14

📜🤖 Added by blurb_it.

Merge branch 'main' into multiprocessing/default-start-method-3.14

Update module docs.

Merge branch 'main' into multiprocessing/default-start-method-3.14

What's New + issue ref fix.

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elif vs if makes a difference...

simplify the default selection logic.

typo fix in NEWS Co-authored-by: Hugo van Kemenade <[email protected]>

Better explain test logic with comments.

Make an explanatory comment more clear.

minor NEWS wording improvement. line length.

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🔨 test-with-buildbots

Why is bench_mp_pool so much slower from CPython 3.12 onwards? faster-cpython/benchmarking-public#43

Fallback to spawn as mp start method when otherwise not compatible emmett-framework/granian#703

Potential performance regression with Python 3.14 bench_mp_pool on Linux #139881

perf(arb): fix event-loop starvation — compute 11s → 300ms bashyrov/wallet-monitor#104