[petsc-users] Petsc with OpenMP

Matthew Knepley knepley at gmail.com
Wed Aug 23 05:45:22 CDT 2017

On Wed, Aug 23, 2017 at 6:42 AM, Khai Pham <khaipham at mit.edu> wrote:

> Hi All,
> I searched for the information about Petsc with OpenMP support. I came
> cross Danyang Su question a couple of month ago at
> https://lists.mcs.anl.gov/pipermail/petsc-users/2017-June/032975.html
> https://lists.mcs.anl.gov/pipermail/petsc-users/2017-June/032975.html . I
> tried to configure Petsc version 3.5.4 but it said that "Please use petsc
> master (git branch) for OpenMP functionality". As Barry mentioned, one has
> to use an older version of petsc for OpenMp support. Could you please tell
> me what the the last version of petsc which supports OpenMP? Thanks!

1) It is 3.5.4. You might have to take out that check in configure.

2) The reason this was abandoned is that it is worse than useless. You do
not get any speed improvement over using pure MPI,
and it makes the whole code much more complicated.



> Best,
> Khai
What most experimenters take for granted before they begin their
experiments is infinitely more interesting than any results to which their
experiments lead.
-- Norbert Wiener

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