http://www-unix.mcs.anl.gov/petsc/petsc-as/documentation/faq.html#slow
On Sep 21, 2008, at 2:22 PM, Chen, Changjun wrote: > Dear Sir, > I have be using PETSc for many days. Recently I find one > subroutine in PETSc is a little slow, It is an initialization > subroutine to fill in the matrix elements: > > call MatSetValues(A,ione,II,ione,JJ,v,INSERT_VALUES,ierr) > > I find that the total time to fill in the matrix data is even > much longer than the iteration time to solve the system > call KSPSolve(ksp,b,x,ierr) > How could this happen? Could I accelerate the time for filling > in the data? > > Sincerely, > Changjun Chen >
