[petsc-users] Does PETSc take advantage of symmetry in iterative solvers

[Alexander Grayver]

Hello,

I remember similar question has been asked long time ago, but I can not 
find it.

If I set MatSetOption(A,MAT_SYMMETRIC,PETSC_TRUE), does PETSc take this 
into account when doing MatMult or similar operations?
As far as I can see it does not (I'm not sure I look at the right place 
though). Could it really save time in principle?

-- 
Regards,
Alexander