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Bug 1473440 - Unreliable result from MPI_Wtime in openmpi-1.10.5
Unreliable result from MPI_Wtime in openmpi-1.10.5
Status: ON_QA
Product: Fedora
Classification: Fedora
Component: openmpi (Show other bugs)
25
Unspecified Unspecified
unspecified Severity unspecified
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Assigned To: Doug Ledford
Fedora Extras Quality Assurance
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Reported: 2017-07-20 16:50 EDT by Feng Yu
Modified: 2017-07-23 02:56 EDT (History)
3 users (show)

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Description Feng Yu 2017-07-20 16:50:50 EDT
Description of problem:

openmpi-1.10.5 has a serious bug in MPI_Wtime, giving wrong results due to a misunderstood optimization. This was later fixed. See

https://github.com/open-mpi/ompi/issues/3003

Please update openmpi in Fedora to 1.10.7 which has the fix.

Version-Release number of selected component (if applicable):

openmpi-1.10.5

How reproducible:

On platform with CPU frequency scaling, always.

Steps to Reproduce:

1. Profile any application with MPI_Wtime

Actual results:

Measured time during operations become negative.

Expected results:

They shall be wall clock time.

Additional info:
Comment 1 Fedora Update System 2017-07-20 18:51:17 EDT
openmpi-1.10.7-1.fc25 has been submitted as an update to Fedora 25. https://bodhi.fedoraproject.org/updates/FEDORA-2017-682df1f704
Comment 2 Fedora Update System 2017-07-20 18:51:26 EDT
openmpi-1.10.7-1.fc24 has been submitted as an update to Fedora 24. https://bodhi.fedoraproject.org/updates/FEDORA-2017-90af4da3cf
Comment 3 Fedora Update System 2017-07-23 02:54:16 EDT
openmpi-1.10.7-1.fc24 has been pushed to the Fedora 24 testing repository. If problems still persist, please make note of it in this bug report.
See https://fedoraproject.org/wiki/QA:Updates_Testing for
instructions on how to install test updates.
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2017-90af4da3cf
Comment 4 Fedora Update System 2017-07-23 02:56:32 EDT
openmpi-1.10.7-1.fc25 has been pushed to the Fedora 25 testing repository. If problems still persist, please make note of it in this bug report.
See https://fedoraproject.org/wiki/QA:Updates_Testing for
instructions on how to install test updates.
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2017-682df1f704

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