[petsc-users] Does flagging a matrix as symmetric improving performances?

[Barry Smith]

  Set the flag, it cannot harm. I cannot see that hypre boomerAMG has options to indicate matrix symmetry to take advantage of it.

  Stefano or Mark would know better than I.

  No, do not change MPIAIJ it offers the most preconditioners.

  Barry




> On Oct 21, 2022, at 11:36 AM, Edoardo alinovi <edoardo.alinovi at gmail.com> wrote:
> 
> Hi Berry, 
> 
> Thank you for the hints. Actually, I am using MPIAIJ, does this mean I need to change the matrix format? 
> 
> Most of the time I am using CG + boomerAMG, do you think that using a sym matrix can be any good for the performance?  
> 
> Cheers
> 
>