Interesting, I am seeing the same thing with ksp/ex56 (elasticity) with 30^3 grid on each process. One process runs fine (1.5 sec) but 8 processes with 30^3 on each process took 156 sec.
And, PETSc's log_view is running extremely slow. I have the total time (156) but each event is taking like a minute or more to come out. On Tue, Jun 26, 2018 at 10:13 AM Junchao Zhang <[email protected]> wrote: > > On Tue, Jun 26, 2018 at 8:26 AM, Mark Adams <[email protected]> wrote: > >> >> >> 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. >> > > I ran with 27 processors and each had 30^3 unknowns. > >> >> >>> >>> --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 >>>> >>>> >>> >
