[petsc-users] MPI barrier issue using MatZeroRows
Amneet Bhalla
mail2amneet at gmail.com
Wed Nov 29 18:26:44 CST 2023
Ah, I also tried without step 2 (i.e., manually doing MPI_allgatherv for
Dirichlet rows), and that also works. So it seems that each processor needs
to send in their own Dirichlet rows, and not a union of them. Is that
correct?
On Wed, Nov 29, 2023 at 3:48 PM Amneet Bhalla <mail2amneet at gmail.com> wrote:
> 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 <bsmith at petsc.dev> wrote:
>
>>
>>
>> On Nov 29, 2023, at 2:11 PM, Matthew Knepley <knepley at gmail.com> wrote:
>>
>> 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?
>>
>>
>> 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 <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/>
>>
>>
>>
>
> --
> --Amneet
>
>
>
>
--
--Amneet
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