[petsc-dev] [GPU] SEGV with: mpiexec -np 2 ./ex2 -ksp_type cg -m 10 -n 10 -pc_type bjacobi -sub_pc_type jacobi -mat_type aijcusp -vec_type cusp

[Projet_TRIOU]

On 07/31/14 10:43, Karl Rupp wrote:
> Hi,
>
>
> > Another crash when using ex2 (src/ksp/ksp/examples/tutorials) in
>> parallel on GPU, when playing with
>> precondtionners:
>>
>> mpiexec -np 1 ./ex2 -ksp_type cg -m 10 -n 10 -pc_type bjacobi
>> -sub_pc_type jacobi
>> Norm of error 5.71895e-06 iterations 14
>> mpiexec -np 1 ./ex2 -ksp_type cg -m 10 -n 10 -pc_type bjacobi
>> -sub_pc_type jacobi -mat_type aijcusp -vec_type cusp
>> Norm of error 5.71895e-06 iterations 14
>> mpiexec -np 2 ./ex2 -ksp_type cg -m 10 -n 10 -pc_type bjacobi
>> -sub_pc_type jacobi
>> Norm of error 5.71895e-06 iterations 14
>> mpiexec -np 2 ./ex2 -ksp_type cg -m 10 -n 10 -pc_type bjacobi
>> -sub_pc_type jacobi -mat_type aijcusp -vec_type cusp
>> [0]PETSC ERROR:
>> ------------------------------------------------------------------------
>> [0]PETSC ERROR: Caught signal number 11 SEGV: Segmentation Violation,
>> probably memory access out of range
>> [0]PETSC ERROR: Try option -start_in_debugger or 
>> -on_error_attach_debugger
>> [0]PETSC ERROR: or see
>> http://www.mcs.anl.gov/petsc/documentation/faq.html#valgrind[0]PETSC
>> ERROR: or try http://valgrind.org on GNU/linux and Apple Mac OS X to
>> find memory corruption errors
>> [0]PETSC ERROR: configure using --with-debugging=yes, recompile, link,
>> and run
>> [0]PETSC ERROR: to get more information on the crash.
>> [0]PETSC ERROR: --------------------- Error Message
>> --------------------------------------------------------------
>>
>> Whereas the last one should work exactly as:
>> mpiexec -np 2 ./ex2 -ksp_type cg -m 10 -n 10 -pc_type jacobi -mat_type
>> aijcusp -vec_type cusp
>> Norm of error 5.71895e-06 iterations 14
>>
>> Or I miss something ?
>
> this is a known problem with block-jacobi for which Dominic created a 
> pull request here:
> https://bitbucket.org/petsc/petsc/pull-request/178/make-cusp-and-cusparse-solver-packages 
>
>
> I was talking to Dominic yesterday and we plan to get the series of 
> GPU-related pull requests merged into next and master within the next 
> couple of days. If it's urgent, please try that feature branch in the 
> meanwhile.
>
> Best regards,
> Karli
>
Great, many thanks, I will wait and test in master branch when Dominic's 
work will be pushed.

Pierre

-- 
*Trio_U support team*
Marthe ROUX (01 69 08 00 02) Saclay
Pierre LEDAC (04 38 78 91 49) Grenoble
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