[petsc-users] MPI barrier issue using MatZeroRows
Matthew Knepley
knepley at gmail.com
Wed Nov 29 13:11:56 CST 2023
On Wed, Nov 29, 2023 at 1:55 PM Amneet Bhalla <mail2amneet at gmail.com> 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?
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 <knepley at gmail.com>
> wrote:
>
>> On Wed, Nov 29, 2023 at 12:30 PM Amneet Bhalla <mail2amneet at gmail.com>
>> 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 at 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 at 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 at 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 <bsmith at petsc.dev> wrote:
>>>
>>>>
>>>>
>>>> On Nov 29, 2023, at 1:16 AM, Amneet Bhalla <mail2amneet at gmail.com>
>>>> 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 <mail2amneet at gmail.com>
>>>> 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 <mail2amneet at gmail.com>
>>>>> wrote:
>>>>>
>>>>>>
>>>>>>
>>>>>> On Tue, Nov 28, 2023 at 6:42 PM Barry Smith <bsmith at petsc.dev> 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 <mail2amneet at gmail.com>
>>>>>>> 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 at 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/>
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