MG is not stable with richardson/jacobi, or at least it is almost not
stable.
Yea I would guess gmres will go forever because it does not care.
I think CG exists when it gets a negative number for beta or whatever and
it was probably -eps.
That is my guess.
On Fri, Mar 18, 2022 at 3:17 PM Barry
The GAMG produced an indefinite operator. I don't know if there is a way to
detect why this happened or how to stop it.
You can try -ksp_type gmres and see how that goes since it can handle an
indefinite preconditioner.
> On Mar 18, 2022, at 11:53 AM, Fabio Durastante
> wrote:
>
>
On Fri, Mar 18, 2022 at 11:44 AM Fabio Durastante
wrote:
> Hi everybody,
>
> I'm trying to run the rotated anisotropy example ex54f using CG and GAMG
> as preconditioner, I run it with the command:
>
> mpirun -np 2 ./ex54f -ne 1011 \
> -theta 18.0 \
> -epsilon 100.0 \
> -pc_type gamg \
>
On Fri, Mar 18, 2022 at 11:28 AM Sajid Ali Syed wrote:
> Hi Matt/Mark,
>
> I'm working on a Poisson solver for a distributed PIC code, where the
> particles are distributed over MPI ranks rather than the grid. Prior to the
> solve, all particles are deposited onto a (DMDA) grid.
>
> The current
On Fri, Mar 18, 2022 at 10:28 AM Sajid Ali Syed wrote:
> Hi Matt/Mark,
>
> I'm working on a Poisson solver for a distributed PIC code, where the
> particles are distributed over MPI ranks rather than the grid. Prior to the
> solve, all particles are deposited onto a (DMDA) grid.
>
> The current
For the default case:
Linear solve converged due to CONVERGED_ATOL iterations 14
for the other it tells
Linear solve did not converge due to DIVERGED_INDEFINITE_PC iterations 2
that again seems a bit strange to me, since this should be a symmetric V-cycle
built on smoothed aggregation that
Run with -ksp_converged_reason to have it print why it has stopped the
iteration.
> On Mar 18, 2022, at 11:44 AM, Fabio Durastante
> wrote:
>
> Hi everybody,
>
> I'm trying to run the rotated anisotropy example ex54f using CG and GAMG as
> preconditioner, I run it with the command:
>
Hi everybody,
I'm trying to run the rotated anisotropy example ex54f using CG and GAMG as
preconditioner, I run it with the command:
mpirun -np 2 ./ex54f -ne 1011 \
-theta 18.0 \
-epsilon 100.0 \
-pc_type gamg \
-pc_gamg_type agg \
-log_view \
-log_trace \
-ksp_view \
-ksp_monitor \
-ksp_type
Hi Matt/Mark,
I'm working on a Poisson solver for a distributed PIC code, where the particles
are distributed over MPI ranks rather than the grid. Prior to the solve, all
particles are deposited onto a (DMDA) grid.
The current prototype I have is that each rank holds a full size DMDA vector
Hello,
I am writing to you as I am trying to implement a Lagrangian Particle Tracking
method to my eulerian solver that relies on a 3D collocated DMDA.
I have been using examples to develop a first basic code. The latter creates
particles on rank 0 with random coordinates on the whole domain
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