On 12/28/2014 05:54 PM, Alp Kalpalp wrote:
Hi,
Thank you Mark.
Let me clarify my questions;
1-)How to implement or activate a Reorthogonalization procedure for
KSPCG..
As you know, search directions can be found more rapidly (with less
numer of iterations) by using previous successive directions
Without answering the PETSc related questions, interesting discussion,
indeed, but at the cost of purging the previous directions(which means
explicit orthogonalizations with respect to these vectors also), so I am
not sure if you can gain something with this, cost wise...
2-) How to implement or activate a projection space over CG. A sample
projection can be;
P = I - G*((G'*G)\G').
I need to insert project,scale,precondition,re-scae,re-project steps
during each KSPCG iteration. How can I utilize this?
Just a side note, I had previous experience on this that these kinds of
practice increase the cost more...
BR,
Umut
