Hello Karl,
Thanks for fixing the problem. ex19 runs now in parallel on GPU
on the last petsc-dev versions.
I got another problem though but will create another thread.
PL
Hi Pierre,
>> I could reproduce the problem and also get some uninitialized variable
warnings in Valgrind. The debug version detects these errors, hence
you only see the errors in the debug build. For the optimized build,
chances are good that the computed values are either wrong or may
become wrong in other environments. I'll see what I can do when I'm
again at GPU machine tomorrow (parallel GPU debugging via SSH is not
great...)
Sorry, I mean:
Parallel calculation on CPU or GPU run well with PETSc non optimized
library
Parallel calculation on GPU crashes with PETSc optimized library (on CPU
it is OK)
The fact that it happens to run in one mode out of {debug, optimized}
but not in the other is at most a lucky coincidence, but it still
means that this is a bug we need to solve :-)
I could add that the "mpirun -np 1 ex19" runs well for all builds on CPU
and GPU.
I see valgrind warnings in the vector scatter routines, which is
likely the reason why it doesn't work with multiple MPI ranks.
Best regards,
Karli
--
*Trio_U support team*
Marthe ROUX (01 69 08 00 02) Saclay
Pierre LEDAC (04 38 78 91 49) Grenoble
