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python multi-core slow? #10

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teuben opened this issue Jan 4, 2021 · 1 comment
Open

python multi-core slow? #10

teuben opened this issue Jan 4, 2021 · 1 comment

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@teuben
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teuben commented Jan 4, 2021 •
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This is still a mystery:
make bench
853.92user 13.03system 3:12.99elapsed 449%CPU
whereas
OMP_NUM_THREADS=1 make bench
gives
149.48user 1.66system 2:31.27elapsed 99%CPU

For the record, this is on 11th Gen Intel(R) Core(TM) i5-1135G7
@teuben teuben added the New No work done yet label Jan 4, 2021
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teuben commented Mar 11, 2021

An interesting observation. The command

   conda install -c conda-forge openmp

apparently normalizes python again.

@teuben teuben removed the New No work done yet label Mar 11, 2021
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@teuben