Only implemented this strategy in TS is not enough, i.e. DC sweep (each DC
point requires nonlinear iteration) may also need it.
Will you implement it into the SNES and send me the patch?
For example, a flag -3 to SNESSetLagPreconditioner.
At the first ineration of each SENSSolve call, the PC will be built and never
change in the same SENSSolve iteration.
I'd like to try it asap since this strategy improves simulation speed
significantly.
Gong Ding
I've been meaning to implement this for a while. You can put custom SNES
control into a pre-stage or pre-step hook, but this particular case should, in
my opinion, be provided as a TS option.
On Wed, Oct 3, 2012 at 11:00 AM, Gong Ding<gdiso at ustc.edu> wrote:
Hi,
I am doing a nonlinear transient simulation. For each time step, a SNESSolve
is called.
I want to do a LU factorization at the first Newton iteration of EACH time
step, and for the following Newton steps (in the same time step), no
factorization any more. For the next time step, the LU factorization should be
done again.
SNESSetLagPreconditioner(-1) seems just skips all the following factorization,
even in the different time step.
How can I do?
Gong Ding
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