Hi, I have been testing PETSc's scalability on clusters for matrices of sizes 2000, 10,000, uptill 60,000.
All I did was try to solve Ax=b for these matrices. I found that the solution time dips if I use upto 16 or 32 processors. However for a larger number of processors however the solution time seems to go up rather than down. IS there anyway I can make my code strongly scalable ? I am measuring the total time (sec) and KSP_SOLVE time in the -log_summary output. Both times show the same behaviour described above. Gaurish -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20110307/d6f100be/attachment.htm>
