> On 21 Oct 2022, at 10:46 AM, TARDIEU Nicolas wrote:
>
> Dear Pierre,
>
> To complete my last post, in fact, the initial code (playing with the LGMap)
> was correct. It was my test case that was wrong.
> Once fixed according to your suggestion, everything turns out to be OK.
> I am neverthel
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 ali
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
For most solvers, just setting this flag will not, by itself, will not improve
the setup time. An exception to this is PCGAMG in the latest release where it
will improve the solution time.
For some preconditioner situations you can use MATSBAIJ to store the matrix,
this can help noticeably
Hi PETSc friends,
As per object, do you think that flagging a matrix as symmetric might
improve setup times of the preconditioner?
Thank you as always.
On Thu, Oct 20, 2022 at 10:27 PM Barry Smith wrote:
>
> Some of the valgrind information does not appear to make sense
>
> PetscMemcpy() is not calling SNESSolve() so I suspect there must be some
> serious corruption of something to this impossible stack trace
>
I ran Valgrind on it, and it lo
Dear Pierre,
To complete my last post, in fact, the initial code (playing with the LGMap)
was correct. It was my test case that was wrong.
Once fixed according to your suggestion, everything turns out to be OK.
I am nevertheless wondering if this IS embeding according to the global
numbering sho
