[petsc-users] MatCopy and MatSetValue consume most 99 percentage of runtime

[Jed Brown]

On Wed, Apr 20, 2011 at 03:50, Debao Shao <Debao.Shao at brion.com> wrote:

>  ierr = MatZeroEntries( M ); assert( ierr  == 0);
>  ierr = MatDiagonalSet( M, vec.pv, INSERT_VALUES );
>  ierr = MatCopy( ms->M, mStorage->M,  DIFFERENT_NONZERO_PATTERN );
>

Is M somehow related to ms->M or mStorage->M?

What do you actually want to do?
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