[petsc-users] slepc external matrix-vector product subroutine

[tijovaz]

Hi,

Preallocation of the matrix greatly improved the speed up of the 
eigensolver.


Is it possible to use the lapack routine 'DSPMV' in the external 
matrix-vector multiplication for the shellmatrix ?
I couldn't find this routine in the petscblaslapack.h or 
slepcblaslapack.h.  Am I missing something?

If there is a slepc/petsc matrix-vector multiplication routine that 
would also work.

Thanks,
Tijo