[petsc-users] Not getting scalability.

[Gaurish Telang]

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
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