AMReX-Combustion / PeleLMeX

An adaptive mesh hydrodynamics simulation code for low Mach number reacting flows without level sub-cycling.

https://amrex-combustion.github.io/PeleLMeX/

BSD 3-Clause "New" or "Revised" License

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OMP problem? #199

Closed jckim1201 closed 1 year ago

jckim1201 commented 1 year ago

Hi everyone,

I'm trying to solve the FlameSheet problem, which is a RegTest within PeleLMeX. I have a problem that when I apply the OMP option of GNUmakefile, the problem does not converge and hangs with errors. I don't have any problems when using MPI only. Is there a problem with the OMP option?

The compilation options are as follows

Compilation

COMP = gnu USE_MPI = TRUE USE_OMP = TRUE USE_CUDA = FALSE USE_HIP = FALSE

baperry2 commented 1 year ago

OpenMP is currently not supported with the CVODE chemistry integrator. I'd recommend just sticking with pure MPI for parallelism on CPU, we don't expect there would be big gains for MPI+OpenMP in most cases anyway (the explicit RK chemistry integrator does work with OpenMP, but CVODE is much better than that).

jckim1201 commented 1 year ago

Thank you.