[petsc-users] Can I use TAO for embarrassingly parallel problems with multiple threads?

[Matthew Knepley]

On Thu, Dec 20, 2018 at 10:30 AM Krzysztof Kamieniecki via petsc-users <
petsc-users at mcs.anl.gov> wrote:

> Hello All,
>
> I have an embarrassingly parallel problem that I would like to use TAO on,
> is there some way to do this with threads as opposed to multiple processes?
>

You should be able to run COMPLETELY independent object on different
threads. However, notice that
there is absolutely no advantage to doing this. Why do you want to run
independent instances on multiple
threads?

  Thanks,

     Matt


>  I compiled PETSc with the following flags
> ./configure \
> --prefix=${DEP_INSTALL_DIR} \
> --with-threadsafety --with-log=0 --download-concurrencykit \
> --with-openblas=1 \
> --with-openblas-dir=${DEP_INSTALL_DIR} \
> --with-mpi=0 \
> --with-shared=0 \
> --with-debugging=0 COPTFLAGS='-O3' CXXOPTFLAGS='-O3' FOPTFLAGS='-O3'
>
> When I run TAO in multiple threads I get the error "Called VecxxxEnd() in
> a different order or with a different vector than VecxxxBegin()"
>
> Thanks,
> Krys
>
>

-- 
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

https://www.cse.buffalo.edu/~knepley/ <http://www.cse.buffalo.edu/~knepley/>
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