On Mon, Apr 25, 2011 at 9:06 AM, Eugene Kozlov <[email protected]>wrote:
Hello,
To answer any kind of question about performance, we need the full output of -log_summary. Matt
I am trying to test PETSc capability of solving sparse linear systems in parallel with GPU.
I compiled and tried to run example src/ksp/ksp/examples/tutorials/ex2.c, which can be executed in parallel.
In this example matrix and vectors created using VecSetFromOptions() and MatSetFromOptions().
According to the page http://www.mcs.anl.gov/petsc/petsc-2/features/gpus.html , I execute the program with keys
-vec_type mpicusp -mat_type mpiaijcusp
in parallel on the different number of GPUs. Full command:
cleo-submit -np 1 ex2 -ksp_type cg -vec_type mpicusp -mat_type mpiaijcusp -m 800 -n 800
Where 'cleo-submit' is a batch manager utility.
I tested the program on 1, 2 and 3 GPUs. As a result I have output as (for 3 GPUs):
Norm of error 0.00012322 iterations 448 Norm of error 0.00012322 iterations 448 Norm of error 0.00012322 iterations 448
and run times: 30, 40 and 46 seconds respectively.
What can be a cause of these results?
-- Best regards, Eugene
-- 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