[petsc-users] question about Hermitian matrix

[Jed Brown]

On Thu, Mar 21, 2013 at 12:10 AM, Michael Povolotskyi
<mpovolot at purdue.edu>wrote:

>  Hello,
> I have to perform multiplications of a Hermitian distributed matrix by a
> distributed vector.
>
> Questions:
> 1) will setting the  MAT_HERMITIAN option save the memory of the matrix
> storage?
> 2) will it save me time during the multiplication?
>

No, it only changes default preconditioner settings (like incomplete
Cholesky instead of ILU and symmetric ASM instead of RASM). You can
explicitly use the SBAIJ format to use a symmetric format (which saves
memory, but it is sometimes slower because it has to communicate twice).
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