Hello, I have a sparse matrix A. Its size is 494 x 494. It has 1666 nonzeros. I call MatMult(A, x, y). From the profiling result (got by -log_summary), I find MatMult's flops is 2838. I think the flops should be nnz x 2 = 1666 x 2 = 3332. I don't know how PETSc got this number (2838). I also observed the phenomena with other matrices. It seems PETSc always give smaller flops. Why?
Thank you! -- Junchao Zhang -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20111230/e8df6f30/attachment.htm>
