[petsc-users] PETSc-dev and OpenMP

[Barry Smith]

  You don't need any special code to use the OpenMP inside some of the PETSc routines. Just ./configure PETSc with 
--with-openmp  --with-mpi=0 

  then at runtime use -threadcomm_nthreads  <n>  where n is for example for when you run the code.

   When you run with -log_summary it will print how many threads it is using.

    You are free to use OpenMP in your code.


    Barry

On Sep 20, 2013, at 5:01 PM, Danyang Su <danyang.su at gmail.com> wrote:

> Hi Barry,
> 
> Thanks for following up. I just want some PETSc OpenMP example or user guide. Looking forward to your work on superlu_mt.
> 
> Regards,
> 
> Danyang
> 
> On 20/09/2013 6:17 AM, Barry Smith wrote:
>>    Sorry I did not respond sooner. I've been trying to interface PETSc to superlu_mt for a couple of days but haven't completed it yet. I'll let you know if I get it working.
>> 
>>    Barry
>> 
>> On Sep 17, 2013, at 2:31 PM, Danyang Su <danyang.su at gmail.com> wrote:
>> 
>>> Hi Barry,
>>> 
>>> Thanks so much.
>>> Which solvers are current OpenMP parallel currently? Can I use the external package (e.g., SuperLU OpenMP version) with OpenMP through PETSc?
>>> Is there any document or examples available for the usage of PETSc with OpenMP?
>>> 
>>> Thanks again,
>>> 
>>> Danyang
>>> 
>>> On 17/09/2013 11:21 AM, Barry Smith wrote:
>>>>    You can utilize the "OpenMP version of PETSc" with your OpenMP program but not all the solvers are OpenMP parallel currently.
>>>> 
>>>>    Use petsc-dev and configure PETSc with ./configure --with-mpi=0 --with-openmp   see http://www.mcs.anl.gov/petsc/developers/index.html
>>>> 
>>>>    Barry
>>>> 
>>>> 
>>>> On Sep 17, 2013, at 12:29 PM, Danyang Su <danyang.su at gmail.com> wrote:
>>>> 
>>>>> Hi All,
>>>>> 
>>>>> I have a parallel Fortran project utilizing OpenMP parallelism. Before porting to PETSc utilizing MPICH, I want to know if it is possible to use PETSc solver with OpenMP. There is some information for petsc-dev openmp benchmarking as can be found here, http://lists.mcs.anl.gov/pipermail/petsc-dev/2012-March/007817.html. If this is possible, I would like to have a OpenMP version of PETSc solver first, otherwise, the project will be ported to PETSc utilizing MPI. Could anybody give me some advice on this?
>>>>> 
>>>>> Thanks and regards,
>>>>> 
>>>>> Danyang
>