[petsc-users] petsc freezes

[Dominik Szczerba]

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Hi Jed,

Indeed, I could not run anything in parallel at all. Quite desperate, I
had rebooted my PC, and all works again. Must have been some pending
system update or hanging sockets etc.

Thanks,
Dominik

Jed Brown wrote:
> On Sat, 27 Mar 2010 10:31:58 +0100, Dominik Szczerba <dominik at itis.ethz.ch> wrote:
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>> Hi,
>>
>> After a long period with no problems, suddenly my program freezes with
>> - -np>1, right after:
>>
>> int main(int argc, char** argv)
>> {
>> 	int myid=0, np=1;
>> 	PetscErrorCode ierr;
>> 	ierr = PetscInitialize(&argc, &argv, (char *)0, (char *)0);CHKERRQ(ierr);
>> 	// this is never reached
>> 	// ...
>> }
>>
>> This was with Petsc 3.0.0-p9. I have just downloaded and compiled the
>> latest version (3.1-p0) to find out that "make ... test" freezes as well:
>>
>>> make PETSC_DIR=/home/domel/pack/petsc-3.1-p0
>> PETSC_ARCH=linux-gnu-c-release test
>> Running test examples to verify correct installation
>> C/C++ example src/snes/examples/tutorials/ex19 run successfully with 1
>> MPI process
>>
>> [FREEZE]
>>
>> I am using 64bit Ubuntu 9.10. How can I investigate what is happening?
> 
> I suspect a problem with your MPI configuration.  Can you run a simple
> MPI program in parallel?  To investigate, run in a debugger or attach a
> debugger after it has hung.
> 
>   mpiexec -n 2 ./app -start_in_debugger
> 
> OR
> 
>   mpiexec -n 2 xterm -e gdb --args ./app
> 
> OR
> 
>   mpiexec -n 2 ./app &
>   gdb -pid `pgrep app`
> 
> What does the stack trace look like?
> 
> Jed
> 

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