Dear Richard,
I recently attend summer school
in which I learn about paraver but that is the visual tool for performance
from Barcelona SuperComputing center. But it comes with one more pre-
processor and a post-processor. Check the link below.
https://www.bsc.es/discover-bsc/organisation/scientific-structure/performance-tools
Regards,
Heena
On Tue, Aug 3, 2021 at 3:58 PM [email protected] <
[email protected]> wrote:
> Dear all,
> I spent quite some time on our in-house CFD and FSI solvers, which are
> matrix-based and use deal.II, MPI and AMG packages of Trilinos and PETSc,
> all of which are so wonderfully accessible even for engineers like me. My
> computations now focused on problems with relatively small DoF count - say,
> max. 10 mio. - and the number of mpi ranks was eye-balled, staying below
> 20. At this stage, I would like to know
>
> a) which (free) profiling tools can you recommend? I watched the video
> lecture of Wolfgang about that topic, but was looking for more opinions! I
> want to see which parts of the code take time apart from the (already
> detailed) TimerOutput.
>
> b) If I use simply "mpirun -n 4 mycode" on a machine with 8 physical
> cores, why do both PETSc and Trilinos use 8 cores during the AMG setup and
> solve? I observed that using the htop command, even when using an
> off-the-shelf "step-40.release" as included in the library. Does anyone
> else see that? It looks something like this during the AMG setup and solve
> for "mpirun -n 8 step-40":
> [image: screenshot_trilinos_step40_mpirun_n_8.png]
> It might be linked to the installation on the server, where I used candi.
> On my local machine, however, this does not happen.
>
> Any hints are very much welcome, thanks for reading and any tips!
>
> Best regards & greetings from Graz
> Richard
>
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