[petsc-users] PETSC ERROR: Caught signal number 15 Terminate

[Matthew Knepley]

On Tue, Aug 9, 2011 at 10:36 PM, Debao Shao <Debao.Shao at brion.com> wrote:

>  Hi, Matt: ****
>
> ** **
>
> http://www.mcs.anl.gov/petsc/petsc-as/miscellaneous/petscthreads.html says
> “PETSc is not currently thread-safe”.****
>
> And, you said “PETSc allows threads”, I was confused, can you explain a
> little for me?
>

You are not prevented from using threads, but PETSc data structures are not
thread-safe (we do nothing
with threads). By allow, I meant you can do whatever you want, but we do not
supported a threaded model.
Sorry it was not clear.

   Matt


>
>
> Thanks a lot. ****
>
> ** **
>
> Debao ****
>  ------------------------------
>
> *From:* petsc-users-bounces at mcs.anl.gov [mailto:
> petsc-users-bounces at mcs.anl.gov] *On Behalf Of *Matthew Knepley
> *Sent:* Saturday, August 06, 2011 11:19 AM
>
> *To:* PETSc users list
> *Subject:* Re: [petsc-users] PETSC ERROR: Caught signal number 15
> Terminate
> ****
>
>  ** **
>
> On Sat, Aug 6, 2011 at 1:34 AM, Debao Shao <Debao.Shao at brion.com> wrote:**
> **
>
>  Thanks a lot, Jed and Aron. ****
>
>  ****
>
> Do you have ideas for this problem?****
>
>  ****
>
> But I encounter a new problem, the situation is:****
>
> 1, the matrix is big, and can be partitioned to several blocks;****
>
> 2, started several threads to handle each block of matrix;****
>
> 3, integrated all block matrices together.****
>
>  ****
>
> Again, the program crashed with reporting: ****
>
> "[0]PETSC ERROR: Caught signal number 11 SEGV: Segmentation Violation,
> probably memory access out of range"****
>
>  ** **
>
> Yes, PETSc allows threads, but one of your threads is illegally accessing
> memory. I suggest using valgrind to track this down.****
>
> ** **
>
>    Matt****
>
>  ****
>
>  My libpetsc.a is built with option "--with-mpi=0 --with-debugging=0
> -with-log=0 -with-info=0".****
>
> Will it support this type of multiple threads?****
>
>  ****
>
> Thanks,****
>
> Debao****
>  ------------------------------
>
> *From:* petsc-users-bounces at mcs.anl.gov [mailto:
> petsc-users-bounces at mcs.anl.gov] *On Behalf Of *Jed Brown
> *Sent:* Friday, August 05, 2011 9:26 PM
> *To:* PETSc users list
> *Subject:* Re: [petsc-users] PETSC ERROR: Caught signal number 15
> Terminate****
>
>  ****
>
> On Fri, Aug 5, 2011 at 04:00, Debao Shao <Debao.Shao at brion.com> wrote:****
>
> 1, I put "PetscInitialize" at the beginning of main, and "PetscInitialize"
> registers a signal handler to capture "SIGTERM";****
>
> 2, the problem ran in server side will send SIGTERM to kill all of clients
> after one stage is done.****
>
> 3, then, unfortunately, the signal "SIGTERM" is caught by the signal
> handler installed by "PetscInitialize", and caused to abort.****
>
> You can remove the order dependence by running with -no_signal_handler or
> setting your own signal handler with:****
>
>  ****
>
>
> http://www.mcs.anl.gov/petsc/petsc-as/snapshots/petsc-dev/docs/manualpages/Sys/PetscPushSignalHandler.html
> ****
>
> ** **
>  ------------------------------
>
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>
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> -- Norbert Wiener****
>
> ------------------------------
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-- 
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
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