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