Hi,
I've seen reports that Cython's "FastGIL" implementation (which basically
keeps the GIL state in a thread-local variable) is no longer faster than
CPython's plain GIL implementation in recent Python 3.x versions.
Potentially even slower. See the report in
https://github.com/cython/cython/issues/5703
It would be helpful to get user feedback on this.
If you have GIL-heavy Cython code, especially with nested
with-nogil/with-gil sections across functions, and a benchmark that
exercises it, could you please run the benchmark with and without the
feature enabled and report the results?
You can add "-DCYTHON_FAST_GIL=0" to your CFLAGS to disabled it (and "=1"
to enable it explicitly). It's enabled by default in CPython 3.6-3.11 (but
disabled in Cython 0.29.x on Python 3.11).
Thanks,
Stefan
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