[petsc-users] [petsc-maint] petsc ksp solver hangs

[Michael Wick]

I attached a debugger to my run. The code just hangs without throwing an
error message, interestingly. I uses 72 processors. I turned on the ksp
monitor. And I can see it hangs either at the beginning or the end of KSP
iteration. I also uses valgrind to debug my code on my local machine, which
does not detect any issue. I uses fgmres + fieldsplit, which is really a
standard option.

Do you have any suggestions to do?

On Fri, Sep 27, 2019 at 8:17 PM Zhang, Junchao <jczhang at mcs.anl.gov> wrote:

> How many MPI ranks did you use? If it is done on your desktop, you can
> just attach a debugger to a MPI process to see what is going on.
>
> --Junchao Zhang
>
>
> On Fri, Sep 27, 2019 at 4:24 PM Michael Wick via petsc-maint <
> petsc-maint at mcs.anl.gov> wrote:
>
>> Hi PETSc:
>>
>> I have been experiencing a code stagnation at certain KSP iterations.
>> This happens rather randomly, which means the code may stop at the middle
>> of a KSP solve and hangs there.
>>
>> I have used valgrind and detect nothing. I just wonder if you have any
>> suggestions.
>>
>> Thanks!!!
>> M
>>
>
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