[petsc-users] Terminating a process running petsc via petsc4py without mpi_abort

[Hudson, Stephen Tobias P]

I will try this, thanks!
Steve
________________________________
From: Junchao Zhang <junchao.zhang at gmail.com>
Sent: Thursday, June 4, 2020 3:50 PM
To: Hudson, Stephen Tobias P <shudson at anl.gov>
Cc: Balay, Satish <balay at mcs.anl.gov>; petsc-users at mcs.anl.gov <petsc-users at mcs.anl.gov>
Subject: Re: [petsc-users] Terminating a process running petsc via petsc4py without mpi_abort

Hi, Steve,
  Try this branch jczhang/let-signal-handler-call-exit to see if it fixed your problem. If yes, vote for it at https://gitlab.com/petsc/petsc/-/merge_requests/2745 :)

--Junchao Zhang


On Thu, Jun 4, 2020 at 3:40 PM Hudson, Stephen Tobias P via petsc-users <petsc-users at mcs.anl.gov<mailto:petsc-users at mcs.anl.gov>> wrote:
Lisandro,

I don't see an interface to set this through petsc4py. Is it possible?

Thanks,
Steve
________________________________
From: Hudson, Stephen Tobias P <shudson at anl.gov<mailto:shudson at anl.gov>>
Sent: Thursday, June 4, 2020 2:47 PM
To: Balay, Satish <balay at mcs.anl.gov<mailto:balay at mcs.anl.gov>>
Cc: petsc-users at mcs.anl.gov<mailto:petsc-users at mcs.anl.gov> <petsc-users at mcs.anl.gov<mailto:petsc-users at mcs.anl.gov>>; Lisandro Dalcin <dalcinl at gmail.com<mailto:dalcinl at gmail.com>>
Subject: Re: Terminating a process running petsc via petsc4py without mpi_abort

Sounds good. I will have a look at how to set this through petsc4py.

Thanks
Steve
________________________________
From: Satish Balay <balay at mcs.anl.gov<mailto:balay at mcs.anl.gov>>
Sent: Thursday, June 4, 2020 2:32 PM
To: Hudson, Stephen Tobias P <shudson at anl.gov<mailto:shudson at anl.gov>>
Cc: petsc-users at mcs.anl.gov<mailto:petsc-users at mcs.anl.gov> <petsc-users at mcs.anl.gov<mailto:petsc-users at mcs.anl.gov>>; Lisandro Dalcin <dalcinl at gmail.com<mailto:dalcinl at gmail.com>>
Subject: Re: Terminating a process running petsc via petsc4py without mpi_abort

I don't completely understand the issue here. How is sequential run different than parallel run?

In both cases - a PetscErrorHandler is likely getting invoked. One can change this behavior with:

https://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/Sys/PetscPushErrorHandler.html

And there are a few default error handlers to choose


PETSC_EXTERN PetscErrorCode PetscTraceBackErrorHandler(MPI_Comm,int,const char*,const char*,PetscErrorCode,PetscErrorType,const char*,void*);
PETSC_EXTERN PetscErrorCode PetscIgnoreErrorHandler(MPI_Comm,int,const char*,const char*,PetscErrorCode,PetscErrorType,const char*,void*);
PETSC_EXTERN PetscErrorCode PetscEmacsClientErrorHandler(MPI_Comm,int,const char*,const char*,PetscErrorCode,PetscErrorType,const char*,void*);
PETSC_EXTERN PetscErrorCode PetscMPIAbortErrorHandler(MPI_Comm,int,const char*,const char*,PetscErrorCode,PetscErrorType,const char*,void*);
PETSC_EXTERN PetscErrorCode PetscAbortErrorHandler(MPI_Comm,int,const char*,const char*,PetscErrorCode,PetscErrorType,const char*,void*);
PETSC_EXTERN PetscErrorCode PetscAttachDebuggerErrorHandler(MPI_Comm,int,const char*,const char*,PetscErrorCode,PetscErrorType,const char*,void*);
PETSC_EXTERN PetscErrorCode PetscReturnErrorHandler(MPI_Comm,int,const char*,const char*,PetscErrorCode,PetscErrorType,const char*,void*);

Some of the are accessible via command line option. for ex: -on_error_abort or -on_error_mpiabort

Or perhaps you want to completely disable error handler with: -no_signal_handler

cc: petsc-users

Satish

On Thu, 4 Jun 2020, Hudson, Stephen Tobias P wrote:

> Satish,
>
> We are having issues caused by MPI_abort getting called when we try to terminate a sub-process running petsc4py. Ideally we would always use a serial build of petsc/petsc4py in this mode, but many users will have a parallel build. We need to be able to send a terminate signal that just kills the process.
>
> Is there a way to turn off the mpi_abort?
>
> Thanks,
>
> Steve
>
>

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