[Bug 236233] Python multiprocessing is 20x slower with 11.2 compared to 11.0 kernel

bugzilla-noreply at freebsd.org bugzilla-noreply at freebsd.org
Tue Mar 5 13:19:32 UTC 2019


https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=236233

--- Comment #1 from Alex Richardson <arichardson at FreeBSD.org> ---
I can confirm that this is a kernel regression between 11.0 and 11.2.


I updated the kernel on one of the build machines from 11.0 to 11.2 (same
userspace) and now the testsuite is much slower.

Running `./bin/llvm-lit -j32 test/CodeGen/Mips` from the LLVM build directory
now takes 121 seconds instead of 29, i.e. 4x slower.

On a Linux build slave with the same hardware running the test/CodeGen/Mips
tests only takes 6.8 seconds.


Once a I have some more time I can try bisecting but that will probably take a
while.

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