On Tue, Jun 26, 2018 at 12:19 AM Junchao Zhang <[email protected]> wrote:
> Mark, > Your email reminded me my recent experiments. My PETSc was configured > --with-openmp=1. > With hypre, my job ran out of time. That was on an Argonne Xeon cluster. > Interesting. I tested on Cori's Haswell nodes and it looked fine. I did not time it but seemed OK. > I repeated the experiments on Cori's Haswell nodes. --with-openmp=1, > "Linear solve converged due to CONVERGED_RTOL iterations 5". But it took > very long time (10 mins). Without --with-openmp=1, it took less than 1 > second. > Humm. I seemed to run OK on Cori's Haswell nodes. Where you running a significant sized job? I was test small serial runs. > > --Junchao Zhang > > On Fri, Jun 22, 2018 at 3:33 PM, Mark Adams <[email protected]> wrote: > >> We are using KNL (Cori) and hypre is not working when configured >> with '--with-openmp=1', even when not using threads (as far as I can tell, >> I never use threads). >> >> Hypre is not converging, for instance with an optimized build: >> >> srun -n 1 ./ex56 -pc_type hypre -ksp_monitor -ksp_converged_reason >> -ksp_type cg -pc_hypre_type boomeramg >> OMP: Warning #239: KMP_AFFINITY: granularity=fine will be used. >> 0 KSP Residual norm 7.366251922394e+22 >> 1 KSP Residual norm 3.676434682799e+22 >> Linear solve did not converge due to DIVERGED_INDEFINITE_PC iterations 2 >> >> Interestingly in debug mode it almost looks good but it is dying: >> >> 05:09 nid02516 maint *= >> ~/petsc_install/petsc/src/ksp/ksp/examples/tutorials$ make >> PETSC_DIR=/global/homes/m/madams/petsc_install/petsc-cori-knl-dbg64-intel-omp >> PETSC_ARCH="" run >> srun -n 1 ./ex56 -pc_type hypre -ksp_monitor -ksp_converged_reason >> -ksp_type cg -pc_hypre_type boomeramg >> OMP: Warning #239: KMP_AFFINITY: granularity=fine will be used. >> 0 KSP Residual norm 7.882081712007e+02 >> 1 KSP Residual norm 2.500214073037e+02 >> 2 KSP Residual norm 3.371746347713e+01 >> 3 KSP Residual norm 2.918759396143e+00 >> 4 KSP Residual norm 9.006505495017e-01 >> Linear solve did not converge due to DIVERGED_INDEFINITE_PC iterations 5 >> >> This test runs fine on Xeon nodes. I assume that Hypre has been tested on >> KNL. GAMG runs fine, of coarse and the initial residual is similar to this >> debug run. >> >> Could PETSc be messing up the matrix conversion to hypre >> '--with-openmp=1' ? >> >> Any ideas? >> >> Thanks, >> Mark >> >> >
