First, make sure you compiled with support for MPI by running make check [szampini@localhost petsc]$ make check Running test examples to verify correct installation Using PETSC_DIR=/home/szampini/Devel/jointinversion/pkgs/petsc and PETSC_ARCH=arch-joint C/C++ example src/snes/examples/tutorials/ex19 run successfully with 1 MPI process C/C++ example src/snes/examples/tutorials/ex19 run successfully with 2 MPI processes C/C++ example src/snes/examples/tutorials/ex19 run successfully with hypre C/C++ example src/snes/examples/tutorials/ex19 run successfully with mumps Completed test examples
if you have the "2 MPI processes" output, then type [szampini@localhost petsc]$ make -f gmakefile print VAR=MPIEXEC mpiexec For me, mpiexec is system-wide. Il giorno mer 26 feb 2020 alle ore 11:38 Tsung-Hsing Chen < [email protected]> ha scritto: > So, What should I do to use the correct mpiexec? > Am I configure petsc with the wrong way or something should be done? > > Stefano Zampini <[email protected]> 於 2020年2月26日 週三 下午4:26寫道： > >> This is what I get >> >> [szampini@localhost tutorials]$ mpiexec -n 2 ./ex2 -ksp_monitor_short -m >> 5 -n 5 -ksp_gmres_cgs_refinement_type refine_always >> 0 KSP Residual norm 2.73499 >> 1 KSP Residual norm 0.795482 >> 2 KSP Residual norm 0.261984 >> 3 KSP Residual norm 0.0752998 >> 4 KSP Residual norm 0.0230031 >> 5 KSP Residual norm 0.00521255 >> 6 KSP Residual norm 0.00145783 >> 7 KSP Residual norm 0.000277319 >> Norm of error 0.000292349 iterations 7 >> >> When I sequentially, I get (same output as yours) >> >> [szampini@localhost tutorials]$ mpiexec -n 1 ./ex2 -ksp_monitor_short -m >> 5 -n 5 -ksp_gmres_cgs_refinement_type refine_always >> 0 KSP Residual norm 3.21109 >> 1 KSP Residual norm 0.93268 >> 2 KSP Residual norm 0.103515 >> 3 KSP Residual norm 0.00787798 >> 4 KSP Residual norm 0.000387275 >> Norm of error 0.000392701 iterations 4 >> >> This means you are using the wrong mpiexec >> >> Il giorno mer 26 feb 2020 alle ore 11:17 Tsung-Hsing Chen < >> [email protected]> ha scritto: >> >>> Hi, >>> >>> I tried to run the example in ksp/examples/tutorials/ex2. >>> I run the code with : mpiexec -n 2 ./ex2 -ksp_monitor_short -m 5 -n 5 >>> -ksp_gmres_cgs_refinement_type refine_always >>> >>> the output is : >>> 0 KSP Residual norm 3.21109 >>> 1 KSP Residual norm 0.93268 >>> 2 KSP Residual norm 0.103515 >>> 3 KSP Residual norm 0.00787798 >>> 4 KSP Residual norm 0.000387275 >>> Norm of error 0.000392701 iterations 4 >>> 0 KSP Residual norm 3.21109 >>> 1 KSP Residual norm 0.93268 >>> 2 KSP Residual norm 0.103515 >>> 3 KSP Residual norm 0.00787798 >>> 4 KSP Residual norm 0.000387275 >>> Norm of error 0.000392701 iterations 4 >>> >>> My output(above) is twice as the ksp/examples/tutorials/output/ex2_4.out. >>> Is this the right answer that should come out? >>> >>> Thanks in advance, >>> >>> Tsung-Hsing Chen >>> >> >> >> -- >> Stefano >> > -- Stefano
