Thanks Barry! I tried that and it seems to be working. This is what I did. It would be great if you could take a look at it and let me know if this is what you had in mind.
1. Collected Dirichlet rows locally https://github.com/IBAMR/IBAMR/blob/amneetb/acoustically-driven-flows/src/acoustic_streaming/AcousticStreamingPETScMatUtilities.cpp#L731 https://github.com/IBAMR/IBAMR/blob/amneetb/acoustically-driven-flows/src/acoustic_streaming/AcousticStreamingPETScMatUtilities.cpp#L797 2. MPI_allgatherv Dirichlet rows https://github.com/IBAMR/IBAMR/blob/amneetb/acoustically-driven-flows/src/acoustic_streaming/AcousticStreamingPETScMatUtilities.cpp#L805-L810 3. Called the MatZeroRows function https://github.com/IBAMR/IBAMR/blob/amneetb/acoustically-driven-flows/src/acoustic_streaming/AcousticStreamingPETScMatUtilities.cpp#L812-L814 On Wed, Nov 29, 2023 at 11:32 AM Barry Smith <[email protected]> wrote: > > > On Nov 29, 2023, at 2:11 PM, Matthew Knepley <[email protected]> wrote: > > On Wed, Nov 29, 2023 at 1:55 PM Amneet Bhalla <[email protected]> > wrote: > >> So the code logic is after the matrix is assembled, I iterate over all >> distributed patches in the domain to see which of the patch is abutting a >> Dirichlet boundary. Depending upon which patch abuts a physical and >> Dirichlet boundary, a processor will call this routine. However, that same >> processor is “owning” that DoF, which would be on its diagonal. >> >> I think Barry already mentioned this is not going to work unless I use >> the flag to not communicate explicitly. However, that flag is not working >> as it should over here for some reason. >> > > Oh, I do not think that is right. > > Barry, when I look at the code, MPIU_Allreduce is always going to be > called to fix up the nonzero_state. Am I wrong about that? > > > No, you are correct. I missed that in my earlier look. Setting those > flags reduce the number of MPI reductions but does not eliminate them > completely. > > MatZeroRows is collective (as its manual page indicates) so you have to > do the second thing I suggested. Inside your for loop construct an array > containing all the local > rows being zeroed and then make a single call by all MPI processes to > MatZeroRows(). Note this is a small change of just a handful of lines of > code. > > Barry > > > Thanks, > > Matt > > >> I can always change the matrix coefficients for Dirichlet rows during >> MatSetValues. However, that would lengthen my code and I was trying to >> avoid that. >> >> On Wed, Nov 29, 2023 at 10:02 AM Matthew Knepley <[email protected]> >> wrote: >> >>> On Wed, Nov 29, 2023 at 12:30 PM Amneet Bhalla <[email protected]> >>> wrote: >>> >>>> Ok, I added both, but it still hangs. Here, is bt from all three tasks: >>>> >>> >>> It looks like two processes are calling AllReduce, but one is not. Are >>> all procs not calling MatZeroRows? >>> >>> Thanks, >>> >>> Matt >>> >>> >>>> Task 1: >>>> >>>> amneetb@APSB-MacBook-Pro-16:~$ lldb -p 44691 >>>> (lldb) process attach --pid 44691 >>>> Process 44691 stopped >>>> * thread #1, queue = 'com.apple.main-thread', stop reason = signal >>>> SIGSTOP >>>> frame #0: 0x000000018a2d750c >>>> libsystem_kernel.dylib`__semwait_signal + 8 >>>> libsystem_kernel.dylib`: >>>> -> 0x18a2d750c <+8>: b.lo 0x18a2d752c ; <+40> >>>> 0x18a2d7510 <+12>: pacibsp >>>> 0x18a2d7514 <+16>: stp x29, x30, [sp, #-0x10]! >>>> 0x18a2d7518 <+20>: mov x29, sp >>>> Target 0: (fo_acoustic_streaming_solver_2d) stopped. >>>> Executable module set to >>>> "/Users/amneetb/Softwares/IBAMR-Git/objs-dbg/tests/IBTK/fo_acoustic_streaming_solver_2d". >>>> Architecture set to: arm64-apple-macosx-. >>>> (lldb) cont >>>> Process 44691 resuming >>>> Process 44691 stopped >>>> * thread #1, queue = 'com.apple.main-thread', stop reason = signal >>>> SIGSTOP >>>> frame #0: 0x000000010ba40b60 >>>> libpmpi.12.dylib`MPIDI_POSIX_mpi_release_gather_release + 752 >>>> libpmpi.12.dylib`MPIDI_POSIX_mpi_release_gather_release: >>>> -> 0x10ba40b60 <+752>: add w8, w8, #0x1 >>>> 0x10ba40b64 <+756>: ldr w9, [x22] >>>> 0x10ba40b68 <+760>: cmp w8, w9 >>>> 0x10ba40b6c <+764>: b.lt 0x10ba40b4c ; <+732> >>>> Target 0: (fo_acoustic_streaming_solver_2d) stopped. >>>> (lldb) bt >>>> * thread #1, queue = 'com.apple.main-thread', stop reason = signal >>>> SIGSTOP >>>> * frame #0: 0x000000010ba40b60 >>>> libpmpi.12.dylib`MPIDI_POSIX_mpi_release_gather_release + 752 >>>> frame #1: 0x000000010ba48528 >>>> libpmpi.12.dylib`MPIDI_POSIX_mpi_allreduce_release_gather + 1088 >>>> frame #2: 0x000000010ba47964 >>>> libpmpi.12.dylib`MPIDI_Allreduce_intra_composition_gamma + 368 >>>> frame #3: 0x000000010ba35e78 libpmpi.12.dylib`MPIR_Allreduce + 1588 >>>> frame #4: 0x0000000103f587dc libmpi.12.dylib`MPI_Allreduce + 2280 >>>> frame #5: 0x0000000106d67650 >>>> libpetsc.3.17.dylib`MatZeroRows_MPIAIJ(A=0x0000000105846470, N=1, >>>> rows=0x000000016dbfa9f4, diag=1, x=0x0000000000000000, >>>> b=0x0000000000000000) at mpiaij.c:827:3 >>>> frame #6: 0x0000000106aadfac >>>> libpetsc.3.17.dylib`MatZeroRows(mat=0x0000000105846470, numRows=1, >>>> rows=0x000000016dbfa9f4, diag=1, x=0x0000000000000000, >>>> b=0x0000000000000000) at matrix.c:5935:3 >>>> frame #7: 0x00000001023952d0 >>>> fo_acoustic_streaming_solver_2d`IBAMR::AcousticStreamingPETScMatUtilities::constructPatchLevelFOAcousticStreamingOp(mat=0x000000016dc04168, >>>> omega=1, sound_speed=1, rho_idx=3, mu_idx=2, lambda_idx=4, >>>> u_bc_coefs=0x000000016dc04398, data_time=NaN, num_dofs_per_proc=size=3, >>>> u_dof_index_idx=27, p_dof_index_idx=28, >>>> patch_level=Pointer<SAMRAI::hier::PatchLevel<2> > @ 0x000000016dbfcec0, >>>> mu_interp_type=VC_HARMONIC_INTERP) at >>>> AcousticStreamingPETScMatUtilities.cpp:799:36 >>>> frame #8: 0x00000001023acb8c >>>> fo_acoustic_streaming_solver_2d`IBAMR::FOAcousticStreamingPETScLevelSolver::initializeSolverStateSpecialized(this=0x000000016dc04018, >>>> x=0x000000016dc05778, (null)=0x000000016dc05680) at >>>> FOAcousticStreamingPETScLevelSolver.cpp:149:5 >>>> frame #9: 0x000000010254a2dc >>>> fo_acoustic_streaming_solver_2d`IBTK::PETScLevelSolver::initializeSolverState(this=0x000000016dc04018, >>>> x=0x000000016dc05778, b=0x000000016dc05680) at PETScLevelSolver.cpp:340 >>>> :5 >>>> frame #10: 0x0000000102202e5c >>>> fo_acoustic_streaming_solver_2d`main(argc=11, argv=0x000000016dc07450) at >>>> fo_acoustic_streaming_solver.cpp:400:22 >>>> frame #11: 0x0000000189fbbf28 dyld`start + 2236 >>>> (lldb) >>>> >>>> >>>> Task 2: >>>> >>>> amneetb@APSB-MacBook-Pro-16:~$ lldb -p 44692 >>>> (lldb) process attach --pid 44692 >>>> Process 44692 stopped >>>> * thread #1, queue = 'com.apple.main-thread', stop reason = signal >>>> SIGSTOP >>>> frame #0: 0x000000018a2d750c >>>> libsystem_kernel.dylib`__semwait_signal + 8 >>>> libsystem_kernel.dylib`: >>>> -> 0x18a2d750c <+8>: b.lo 0x18a2d752c ; <+40> >>>> 0x18a2d7510 <+12>: pacibsp >>>> 0x18a2d7514 <+16>: stp x29, x30, [sp, #-0x10]! >>>> 0x18a2d7518 <+20>: mov x29, sp >>>> Target 0: (fo_acoustic_streaming_solver_2d) stopped. >>>> Executable module set to >>>> "/Users/amneetb/Softwares/IBAMR-Git/objs-dbg/tests/IBTK/fo_acoustic_streaming_solver_2d". >>>> Architecture set to: arm64-apple-macosx-. >>>> (lldb) cont >>>> Process 44692 resuming >>>> Process 44692 stopped >>>> * thread #1, queue = 'com.apple.main-thread', stop reason = signal >>>> SIGSTOP >>>> frame #0: 0x000000010e5a022c >>>> libpmpi.12.dylib`MPIDI_POSIX_mpi_barrier_release_gather + 516 >>>> libpmpi.12.dylib`MPIDI_POSIX_mpi_barrier_release_gather: >>>> -> 0x10e5a022c <+516>: ldr x10, [x19, #0x4e8] >>>> 0x10e5a0230 <+520>: cmp x9, x10 >>>> 0x10e5a0234 <+524>: b.hs 0x10e5a0254 ; <+556> >>>> 0x10e5a0238 <+528>: add w8, w8, #0x1 >>>> Target 0: (fo_acoustic_streaming_solver_2d) stopped. >>>> (lldb) bt >>>> * thread #1, queue = 'com.apple.main-thread', stop reason = signal >>>> SIGSTOP >>>> * frame #0: 0x000000010e5a022c >>>> libpmpi.12.dylib`MPIDI_POSIX_mpi_barrier_release_gather + 516 >>>> frame #1: 0x000000010e59fd14 >>>> libpmpi.12.dylib`MPIDI_SHM_mpi_barrier + 224 >>>> frame #2: 0x000000010e59fb60 >>>> libpmpi.12.dylib`MPIDI_Barrier_intra_composition_alpha + 44 >>>> frame #3: 0x000000010e585490 libpmpi.12.dylib`MPIR_Barrier + 900 >>>> frame #4: 0x0000000106ac5030 libmpi.12.dylib`MPI_Barrier + 684 >>>> frame #5: 0x0000000108e62638 >>>> libpetsc.3.17.dylib`PetscCommDuplicate(comm_in=1140850688, >>>> comm_out=0x00000001408ae4b0, first_tag=0x00000001408ae4e4) at tagm.c: >>>> 235:5 >>>> frame #6: 0x0000000108e6a910 >>>> libpetsc.3.17.dylib`PetscHeaderCreate_Private(h=0x00000001408ae470, >>>> classid=1211228, class_name="KSP", descr="Krylov Method", mansec="KSP", >>>> comm=1140850688, destroy=(libpetsc.3.17.dylib`KSPDestroy at itfunc.c:1418), >>>> view=(libpetsc.3.17.dylib`KSPView at itcreate.c:113)) at inherit.c:62:3 >>>> frame #7: 0x000000010aa28010 >>>> libpetsc.3.17.dylib`KSPCreate(comm=1140850688, inksp=0x000000016b0a4160) at >>>> itcreate.c:679:3 >>>> frame #8: 0x00000001050aa2f4 >>>> fo_acoustic_streaming_solver_2d`IBTK::PETScLevelSolver::initializeSolverState(this=0x000000016b0a4018, >>>> x=0x000000016b0a5778, b=0x000000016b0a5680) at PETScLevelSolver.cpp:344 >>>> :12 >>>> frame #9: 0x0000000104d62e5c >>>> fo_acoustic_streaming_solver_2d`main(argc=11, argv=0x000000016b0a7450) at >>>> fo_acoustic_streaming_solver.cpp:400:22 >>>> frame #10: 0x0000000189fbbf28 dyld`start + 2236 >>>> (lldb) >>>> >>>> >>>> Task 3: >>>> >>>> amneetb@APSB-MacBook-Pro-16:~$ lldb -p 44693 >>>> (lldb) process attach --pid 44693 >>>> Process 44693 stopped >>>> * thread #1, queue = 'com.apple.main-thread', stop reason = signal >>>> SIGSTOP >>>> frame #0: 0x000000018a2d750c >>>> libsystem_kernel.dylib`__semwait_signal + 8 >>>> libsystem_kernel.dylib`: >>>> -> 0x18a2d750c <+8>: b.lo 0x18a2d752c ; <+40> >>>> 0x18a2d7510 <+12>: pacibsp >>>> 0x18a2d7514 <+16>: stp x29, x30, [sp, #-0x10]! >>>> 0x18a2d7518 <+20>: mov x29, sp >>>> Target 0: (fo_acoustic_streaming_solver_2d) stopped. >>>> Executable module set to >>>> "/Users/amneetb/Softwares/IBAMR-Git/objs-dbg/tests/IBTK/fo_acoustic_streaming_solver_2d". >>>> Architecture set to: arm64-apple-macosx-. >>>> (lldb) cont >>>> Process 44693 resuming >>>> Process 44693 stopped >>>> * thread #1, queue = 'com.apple.main-thread', stop reason = signal >>>> SIGSTOP >>>> frame #0: 0x000000010e59c68c >>>> libpmpi.12.dylib`MPIDI_POSIX_mpi_release_gather_gather + 952 >>>> libpmpi.12.dylib`MPIDI_POSIX_mpi_release_gather_gather: >>>> -> 0x10e59c68c <+952>: ldr w9, [x21] >>>> 0x10e59c690 <+956>: cmp w8, w9 >>>> 0x10e59c694 <+960>: b.lt 0x10e59c670 ; <+924> >>>> 0x10e59c698 <+964>: bl 0x10e59ce64 ; >>>> MPID_Progress_test >>>> Target 0: (fo_acoustic_streaming_solver_2d) stopped. >>>> (lldb) bt >>>> * thread #1, queue = 'com.apple.main-thread', stop reason = signal >>>> SIGSTOP >>>> * frame #0: 0x000000010e59c68c >>>> libpmpi.12.dylib`MPIDI_POSIX_mpi_release_gather_gather + 952 >>>> frame #1: 0x000000010e5a44bc >>>> libpmpi.12.dylib`MPIDI_POSIX_mpi_allreduce_release_gather + 980 >>>> frame #2: 0x000000010e5a3964 >>>> libpmpi.12.dylib`MPIDI_Allreduce_intra_composition_gamma + 368 >>>> frame #3: 0x000000010e591e78 libpmpi.12.dylib`MPIR_Allreduce + 1588 >>>> frame #4: 0x0000000106ab47dc libmpi.12.dylib`MPI_Allreduce + 2280 >>>> frame #5: 0x00000001098c3650 >>>> libpetsc.3.17.dylib`MatZeroRows_MPIAIJ(A=0x0000000136862270, N=1, >>>> rows=0x000000016b09e9f4, diag=1, x=0x0000000000000000, >>>> b=0x0000000000000000) at mpiaij.c:827:3 >>>> frame #6: 0x0000000109609fac >>>> libpetsc.3.17.dylib`MatZeroRows(mat=0x0000000136862270, numRows=1, >>>> rows=0x000000016b09e9f4, diag=1, x=0x0000000000000000, >>>> b=0x0000000000000000) at matrix.c:5935:3 >>>> frame #7: 0x0000000104ef12d0 >>>> fo_acoustic_streaming_solver_2d`IBAMR::AcousticStreamingPETScMatUtilities::constructPatchLevelFOAcousticStreamingOp(mat=0x000000016b0a8168, >>>> omega=1, sound_speed=1, rho_idx=3, mu_idx=2, lambda_idx=4, >>>> u_bc_coefs=0x000000016b0a8398, data_time=NaN, num_dofs_per_proc=size=3, >>>> u_dof_index_idx=27, p_dof_index_idx=28, >>>> patch_level=Pointer<SAMRAI::hier::PatchLevel<2> > @ 0x000000016b0a0ec0, >>>> mu_interp_type=VC_HARMONIC_INTERP) at >>>> AcousticStreamingPETScMatUtilities.cpp:799:36 >>>> frame #8: 0x0000000104f08b8c >>>> fo_acoustic_streaming_solver_2d`IBAMR::FOAcousticStreamingPETScLevelSolver::initializeSolverStateSpecialized(this=0x000000016b0a8018, >>>> x=0x000000016b0a9778, (null)=0x000000016b0a9680) at >>>> FOAcousticStreamingPETScLevelSolver.cpp:149:5 >>>> frame #9: 0x00000001050a62dc >>>> fo_acoustic_streaming_solver_2d`IBTK::PETScLevelSolver::initializeSolverState(this=0x000000016b0a8018, >>>> x=0x000000016b0a9778, b=0x000000016b0a9680) at PETScLevelSolver.cpp:340 >>>> :5 >>>> frame #10: 0x0000000104d5ee5c >>>> fo_acoustic_streaming_solver_2d`main(argc=11, argv=0x000000016b0ab450) at >>>> fo_acoustic_streaming_solver.cpp:400:22 >>>> frame #11: 0x0000000189fbbf28 dyld`start + 2236 >>>> (lldb) >>>> >>>> >>>> On Wed, Nov 29, 2023 at 7:22 AM Barry Smith <[email protected]> wrote: >>>> >>>>> >>>>> >>>>> On Nov 29, 2023, at 1:16 AM, Amneet Bhalla <[email protected]> >>>>> wrote: >>>>> >>>>> BTW, I think you meant using MatSetOption(mat, >>>>> *MAT_NO_OFF_PROC_ZERO_ROWS*, PETSC_TRUE) >>>>> >>>>> >>>>> Yes >>>>> >>>>> instead ofMatSetOption(mat, *MAT_NO_OFF_PROC_ENTRIES*, PETSC_TRUE) ?? >>>>> >>>>> >>>>> Please try setting both flags. >>>>> >>>>> However, that also did not help to overcome the MPI Barrier issue. >>>>> >>>>> >>>>> If there is still a problem please trap all the MPI processes when >>>>> they hang in the debugger and send the output from using bt on all of >>>>> them. >>>>> This way >>>>> we can see the different places the different MPI processes are stuck >>>>> at. >>>>> >>>>> >>>>> >>>>> On Tue, Nov 28, 2023 at 9:57 PM Amneet Bhalla <[email protected]> >>>>> wrote: >>>>> >>>>>> I added that option but the code still gets stuck at the same call >>>>>> MatZeroRows with 3 processors. >>>>>> >>>>>> On Tue, Nov 28, 2023 at 7:23 PM Amneet Bhalla <[email protected]> >>>>>> wrote: >>>>>> >>>>>>> >>>>>>> >>>>>>> On Tue, Nov 28, 2023 at 6:42 PM Barry Smith <[email protected]> >>>>>>> wrote: >>>>>>> >>>>>>>> >>>>>>>> for (int comp = 0; comp < 2; ++comp) >>>>>>>> { >>>>>>>> ....... >>>>>>>> for (Box<NDIM>::Iterator bc(bc_coef_box); bc; >>>>>>>> bc++) >>>>>>>> { >>>>>>>> ...... >>>>>>>> if (IBTK::abs_equal_eps(b, 0.0)) >>>>>>>> { >>>>>>>> const double diag_value = a; >>>>>>>> ierr = MatZeroRows(mat, 1, >>>>>>>> &u_dof_index, diag_value, NULL, NULL); >>>>>>>> IBTK_CHKERRQ(ierr); >>>>>>>> } >>>>>>>> } >>>>>>>> } >>>>>>>> >>>>>>>> In general, this code will not work because each process calls >>>>>>>> MatZeroRows a different number of times, so it cannot match up with >>>>>>>> all the >>>>>>>> processes. >>>>>>>> >>>>>>>> If u_dof_index is always local to the current process, you can call >>>>>>>> MatSetOption(mat, MAT_NO_OFF_PROC_ENTRIES,PETSC_TRUE) above the for >>>>>>>> loop >>>>>>>> and >>>>>>>> the MatZeroRows will not synchronize across the MPI processes >>>>>>>> (since it does not need to and you told it that). >>>>>>>> >>>>>>> >>>>>>> Yes, u_dof_index is going to be local and I put a check on it a few >>>>>>> lines before calling MatZeroRows. >>>>>>> >>>>>>> Can MatSetOption() be called after the matrix has been assembled? >>>>>>> >>>>>>> >>>>>>>> If the u_dof_index will not always be local, then you need, on each >>>>>>>> process, to list all the u_dof_index for each process in an array and >>>>>>>> then >>>>>>>> call MatZeroRows() >>>>>>>> once after the loop so it can exchange the needed information with >>>>>>>> the other MPI processes to get the row indices to the right place. >>>>>>>> >>>>>>>> Barry >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> On Nov 28, 2023, at 6:44 PM, Amneet Bhalla <[email protected]> >>>>>>>> wrote: >>>>>>>> >>>>>>>> >>>>>>>> Hi Folks, >>>>>>>> >>>>>>>> I am using MatZeroRows() to set Dirichlet boundary conditions. This >>>>>>>> works fine for the serial run and the solver produces correct results >>>>>>>> (verified through analytical solution). However, when I run the case in >>>>>>>> parallel, the simulation gets stuck at MatZeroRows(). My understanding >>>>>>>> is >>>>>>>> that this function needs to be called after the >>>>>>>> MatAssemblyBegin{End}() has >>>>>>>> been called, and should be called by all processors. Here is that bit >>>>>>>> of >>>>>>>> the code which calls MatZeroRows() after the matrix has been assembled >>>>>>>> >>>>>>>> >>>>>>>> https://github.com/IBAMR/IBAMR/blob/amneetb/acoustically-driven-flows/src/acoustic_streaming/AcousticStreamingPETScMatUtilities.cpp#L724-L801 >>>>>>>> >>>>>>>> I ran the parallel code (on 3 processors) in the debugger >>>>>>>> (-start_in_debugger). Below is the call stack from the processor that >>>>>>>> gets >>>>>>>> stuck >>>>>>>> >>>>>>>> amneetb@APSB-MBP-16:~$ lldb -p 4307 >>>>>>>> (lldb) process attach --pid 4307 >>>>>>>> Process 4307 stopped >>>>>>>> * thread #1, queue = 'com.apple.main-thread', stop reason = signal >>>>>>>> SIGSTOP >>>>>>>> frame #0: 0x000000018a2d750c >>>>>>>> libsystem_kernel.dylib`__semwait_signal + 8 >>>>>>>> libsystem_kernel.dylib`: >>>>>>>> -> 0x18a2d750c <+8>: b.lo 0x18a2d752c ; <+40> >>>>>>>> 0x18a2d7510 <+12>: pacibsp >>>>>>>> 0x18a2d7514 <+16>: stp x29, x30, [sp, #-0x10]! >>>>>>>> 0x18a2d7518 <+20>: mov x29, sp >>>>>>>> Target 0: (fo_acoustic_streaming_solver_2d) stopped. >>>>>>>> Executable module set to >>>>>>>> "/Users/amneetb/Softwares/IBAMR-Git/objs-dbg/tests/IBTK/fo_acoustic_streaming_solver_2d". >>>>>>>> Architecture set to: arm64-apple-macosx-. >>>>>>>> (lldb) cont >>>>>>>> Process 4307 resuming >>>>>>>> Process 4307 stopped >>>>>>>> * thread #1, queue = 'com.apple.main-thread', stop reason = signal >>>>>>>> SIGSTOP >>>>>>>> frame #0: 0x0000000109d281b8 >>>>>>>> libpmpi.12.dylib`MPIDI_POSIX_mpi_barrier_release_gather + 400 >>>>>>>> libpmpi.12.dylib`MPIDI_POSIX_mpi_barrier_release_gather: >>>>>>>> -> 0x109d281b8 <+400>: ldr w9, [x24] >>>>>>>> 0x109d281bc <+404>: cmp w8, w9 >>>>>>>> 0x109d281c0 <+408>: b.lt 0x109d281a0 ; <+376> >>>>>>>> 0x109d281c4 <+412>: bl 0x109d28e64 ; >>>>>>>> MPID_Progress_test >>>>>>>> Target 0: (fo_acoustic_streaming_solver_2d) stopped. >>>>>>>> (lldb) bt >>>>>>>> * thread #1, queue = 'com.apple.main-thread', stop reason = signal >>>>>>>> SIGSTOP >>>>>>>> * frame #0: 0x0000000109d281b8 >>>>>>>> libpmpi.12.dylib`MPIDI_POSIX_mpi_barrier_release_gather + 400 >>>>>>>> frame #1: 0x0000000109d27d14 >>>>>>>> libpmpi.12.dylib`MPIDI_SHM_mpi_barrier + 224 >>>>>>>> frame #2: 0x0000000109d27b60 >>>>>>>> libpmpi.12.dylib`MPIDI_Barrier_intra_composition_alpha + 44 >>>>>>>> frame #3: 0x0000000109d0d490 libpmpi.12.dylib`MPIR_Barrier + >>>>>>>> 900 >>>>>>>> frame #4: 0x000000010224d030 libmpi.12.dylib`MPI_Barrier + 684 >>>>>>>> frame #5: 0x00000001045ea638 >>>>>>>> libpetsc.3.17.dylib`PetscCommDuplicate(comm_in=-2080374782, >>>>>>>> comm_out=0x000000010300bcb0, first_tag=0x000000010300bce4) at >>>>>>>> tagm.c:235:5 >>>>>>>> frame #6: 0x00000001045f2910 >>>>>>>> libpetsc.3.17.dylib`PetscHeaderCreate_Private(h=0x000000010300bc70, >>>>>>>> classid=1211227, class_name="PetscSF", descr="Star Forest", >>>>>>>> mansec="PetscSF", comm=-2080374782, >>>>>>>> destroy=(libpetsc.3.17.dylib`PetscSFDestroy at sf.c:224), >>>>>>>> view=(libpetsc.3.17.dylib`PetscSFView at sf.c:841)) at inherit.c:62 >>>>>>>> :3 >>>>>>>> frame #7: 0x00000001049cf820 >>>>>>>> libpetsc.3.17.dylib`PetscSFCreate(comm=-2080374782, >>>>>>>> sf=0x000000016f911a50) >>>>>>>> at sf.c:62:3 >>>>>>>> frame #8: 0x0000000104cd3024 >>>>>>>> libpetsc.3.17.dylib`MatZeroRowsMapLocal_Private(A=0x00000001170c1270, >>>>>>>> N=1, >>>>>>>> rows=0x000000016f912cb4, nr=0x000000016f911df8, >>>>>>>> olrows=0x000000016f911e00) >>>>>>>> at zerorows.c:36:5 >>>>>>>> frame #9: 0x000000010504ea50 >>>>>>>> libpetsc.3.17.dylib`MatZeroRows_MPIAIJ(A=0x00000001170c1270, N=1, >>>>>>>> rows=0x000000016f912cb4, diag=1, x=0x0000000000000000, >>>>>>>> b=0x0000000000000000) at mpiaij.c:768:3 >>>>>>>> >>>>>>>> > > -- > What most experimenters take for granted before they begin their > experiments is infinitely more interesting than any results to which their > experiments lead. > -- Norbert Wiener > > https://www.cse.buffalo.edu/~knepley/ > <http://www.cse.buffalo.edu/~knepley/> > > > -- --Amneet
