Hi,
The changes made to bcgs in the commit below should be applied to
tfqmr, tcqmr, and cgs as well.
Cheers,
Toby
author Barry Smith bsmith at mcs.anl.gov
Wed, 19 Jan 2011 20:10:29 -0600 (13 months ago)
changeset 18159 a526acdfdc95
parent 18153 3c53022524fb
child 18160 4db6569c26af
I've set up PCMG using PCML with repartitioning, which gives some
processors empty partitions on all by the finest levels. As smoothers
I want to use block incomplete factorizations with one block per
processor. My command line looks like this:
-info -pc_ml_PrintLevel 10 -pc_ml_maxCoarseSize
What's the difference between -pc_type sor -pc_sor_local_symmetric
and -pc_type asm -sub_pc_type sor -sub_pc_sor_local_symmetric?
Specifically, this converges in 30 iterations:
./ex49 -mx 100 -my 100 -elas_ksp_view -elas_ksp_monitor -elas_ksp_type
cg -elas_pc_type gamg -elas_pc_gamg_verbose 10
What's the difference between -pc_type sor -pc_sor_local_symmetric
and -pc_type asm -sub_pc_type sor -sub_pc_sor_local_symmetric?
The ASM version sticks a Krylov iteration in these by default.
Matt
In this case the inner ksp is preonly so I think they ought to be the
same,
On Mon, Jan 07, 2013 at 09:36:05AM -0600, Jed Brown wrote:
On Mon, Jan 7, 2013 at 9:09 AM, Mark F. Adams mark.adams at
columbia.eduwrote:
ex56 is a simple 3D elasticity problem. There is a runex56 target that
uses GAMG and a runex56_ml. These have a generic parameters and ML and
GAMG
On Tue, Jan 08, 2013 at 08:07:36AM -0600, Jed Brown wrote:
On Mon, Jan 7, 2013 at 4:23 PM, Mark F. Adams mark.adams at
columbia.eduwrote:
'-pc_ml_reuse_interpolation true' does seem to get ML to reuse some mesh
setup. The setup time goes from .3 to .1 sec on one of my tests from the
I'm sorry if this is more of a mercurial question, but here goes:
I'm keeping track of petsc-dev with mercurial. I'm trying to make a
tarball of my source, because I have some local tweaks that I'd like
to keep when I build on a new system. Two issues:
1) make dist doesn't seem to run
On Mon, Feb 04, 2013 at 12:30:39PM -0600, Dmitry Karpeev wrote:
Francesco,
Are you using any pressure stabilization scheme? If not, the 11-block in
your Jacobian
A = [A00 A01; A10 A11] would typically be zero, and preconditioning it with
jacobi wouldn't really work.
If A11 = 0, you ought
If I'm solving a PDE-constrained optimization problem, I'd like to be
able to specify the equations and then choose at runtime between a
full-space approach and a reduced-space approach. Is this possible
with petsc?
Thanks,
Toby
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A non-text attachment was
On Sun, Mar 24, 2013 at 11:03:20PM -0500, Jed Brown wrote:
Tobin Isaac tisaac at ices.utexas.edu writes:
If I'm solving a PDE-constrained optimization problem, I'd like to be
able to specify the equations and then choose at runtime between a
full-space approach and a reduced-space
Hi,
If I have a pointwise Jacobian function f, I know that I can call
DMGetDS() and pass f to PetscDSSetJacobian(), and that f will be used
by PetscFEIntegrate() and thus by DMPlexSNESComputeJacobianFEM(). It
looks like PetscFEIntegrate() is only used by plex and not da. Is
there anyway that I
On Mon, Jul 07, 2014 at 05:43:48PM +0200, Matthew Knepley wrote:
On Mon, Jul 7, 2014 at 5:36 PM, Tobin Isaac tis...@ices.utexas.edu wrote:
Hi,
If I have a pointwise Jacobian function f, I know that I can call
DMGetDS() and pass f to PetscDSSetJacobian(), and that f will be used
On Fri, Sep 29, 2017 at 12:19:54PM +0100, Lawrence Mitchell wrote:
> Dear all,
>
> I'm attempting to understand some results I'm getting for matmult
> performance. In particular, it looks like I'm obtaining timings that suggest
> that I'm getting more main memory bandwidth than I think is
On Fri, Sep 29, 2017 at 09:04:47AM -0400, Tobin Isaac wrote:
> On Fri, Sep 29, 2017 at 12:19:54PM +0100, Lawrence Mitchell wrote:
> > Dear all,
> >
> > I'm attempting to understand some results I'm getting for matmult
> > performance. In particular, it looks
On Tue, Oct 17, 2017 at 03:40:10PM -0400, Mark Adams wrote:
> Let me just add that we (me and Toby (p4est)) think of tensor grids for
> kinetic problems. A (phase space) grid at every spatial grid point. THis
> allows us to compose our existing 3D grids to get 6D, for instance. This
> work
nch and
to-be-released maintained version v3.8.9.
Cheers,
Toby
>
> Regards,
>
> Yann
>
>
> Le 03/04/2018 à 03:33, Tobin Isaac a écrit :
> > Hi Yann,
> >
> > Thanks for pointing this out to us. Matt and I are the two most
> > actively developing
Hi Yann,
Thanks for pointing this out to us. Matt and I are the two most
actively developing in this area. We have been working on separate
threads and this looks like an issue where we need to sync up. I
think there is a simple fix, but it would be helpful to know which
version petsc you're
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