[petsc-dev] OpenMP support

[Matthew Knepley]

On Mon, Feb 13, 2012 at 9:28 AM, Gerard Gorman <g.gorman at imperial.ac.uk>wrote:

> Hi
>
> I have been working with Lawrence Mitchell and Michele Weiland at EPCC
> to add OpenMP support to the mat/vec classes and we are at the stage
> that we would like to give other other people a chance to play with it.
>
> Lawrence put a branch on bitbucket if you want to browse:
> https://bitbucket.org/wence/petsc-dev-omp/overview
>
> I think that there is a lot in there that needs
> discussion(/modification), so I propose that we try to break this into a
> number of discussions/steps (also I do not want to write a several page
> email).
>
> I am making the assumption here that OpenMP is interesting enough to
> want to put in PETSc. Other than the garden variety multicore, it can
> also be used on Intel MIC. Does this need further discussion?
>
> As a first step - can we add OpenMP support to PETSc conf? Lawrence made
> a first pass at this:
>
> https://bitbucket.org/wence/petsc-dev-omp/src/52afd5fd2c25/config/PETSc/packages/openmp.py
> It does need extending because it will fail in it is current state for a
> number of compilers. I am guessing we would have to reimplement
> something like ax_openmp or similar...what is the right thing to do here?
>

Can you explain the right test?


> Regarding cmake - I only recently learned cmake myself and I have been
> using:
> FIND_PACKAGE(OpenMP) (i.e. cmake does all the heavy lifting in
> FindOpenMP.cmake which it provides). However, as PETSc does not appear
> to use the find_package feature I am not sure what approach should be
> adopted for PETSc. Suggestions?
>

If the configure works right, there is nothing left to do for CMake.

  Matt


> Cheers
> Gerard
>
>


-- 
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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