8000 Testsuite hangs when built with MKL 2018.2 (but not 2017.1) · Issue #10993 · numpy/numpy · GitHub
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bodgerer opened this issue Apr 27, 2018 · 5 comments
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Testsuite hangs when built with MKL 2018.2 (but not 2017.1) #10993

bodgerer opened this issue Apr 27, 2018 · 5 comments
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00 - Bug 29 - Intel/Anaconda

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@bodgerer
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Hi,

I've noticed that numpy's testsuite hangs when numpy is built against MKL 2018.2 - but runs to completion when built against MKL 2017.1.

This is the case for numpy v1.14.2, 1.14.x HEAD and master branches.

I'm on CentOS 7.4 x86_64 on a Broadwell processor, python 2.7.5 (but also affects other pythons), Cython 0.28.2, nose 1.3.7.

By executing this: python -c "import numpy; numpy.test(verbose=2)"

I can see that the hang occurs while running this test: numpy.distutils.tests.test_exec_command.TestExecCommand.test_basic

At this point, the python interpreter is consuming an entire CPU core and, if I strace it, I see a stream of identical lines, all showing:

sched_yield() = 0

Any ideas, please?

Thanks!
@mattip
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mattip commented Apr 27, 2018 •
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Is it a duplicate of #10060, where it is suggested to use this work around?

# work-around 1:
KMP_INIT_AT_FORK=FALSE python script.py
# work-around 2:
MKL_THREADING_LAYER=TBB python script.py`

Edit: add question mark

@bodgerer
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Got it: sorry for the noise. I did search the issues list, just not well enough - honest!

Thanks

@mattip
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mattip commented Apr 27, 2018

Our fault, that issue was closed but a new MKL has not been released yet. Please leave this open so others can find it

@mattip mattip mentioned this issue May 4, 2018
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@mattip mattip mentioned this issue Aug 13, 2018
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@oleksandr-pavlyk
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oleksandr-pavlyk commented Jan 7, 2019 •
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The fix in Intel OpenMP was released in 2018 update 3 of the library. New MKL is available on defaults, and Intel conda channels, as well as on PyPI.

Please close the ticket.

@charris
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charris commented Jan 7, 2019

Thanks for the heads up.

@charris charris closed this as completed Jan 7, 2019
@jeremiedbb jeremiedbb mentioned this issue Mar 3, 2020
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