Dear Matt
On Wed, 25 Jul 2007, Matthew Knepley wrote:
-ksp_type preonly
-pc_type lu
-mat_type aijmumps
-ksp_monitor
It appears that you never call MatSetFromOptions() on the matrix you
create, which would prevent the option from changing the type.
Thank you very much for your help.
Dear Tims,
MUMPS is direct solver so you do not need Krylov subspace which are
generally iterative solver.
May be you are using MUMPS as solver in you problem not as preconditionner.
Regards
Dear Matt
On Wed, 25 Jul 2007, Matthew Knepley wrote:
-ksp_type preonly
-pc_type lu
-mat_type
You could, of course, embed MUMPS as a preconditioner in a Krylov
iteration like GMRES and getthe effect that you want.
Mat
On 7/27/07, Stephan Kramer stephan.kramer at imperial.ac.uk wrote:
Hi Tim,
As Guy said MUMPS is a direct solver, i.e. it constructs the inverse of
the matrix (in some
Hi,
I am also trying to solve the NS eqns in 2d, finite volume mtd, using
fractional step formulation.
I am currently using KSPBCGS and PCILU to solve the momentum eqn matrix
and HYPRE's AMG and the default ksptype to solve the poisson eqn. Do you
ppl think this is a good choice? Or is there
Dear Satish
On Tue, 24 Jul 2007, Satish Balay wrote:
Its best to send installation issues involving configure.log to
petsc-maint at mcs.anl.gov - and not the list.
Okay; sorry for that.
--with-cc=gcc --with-fc=gfortran --with-shared=0 --download-mumps=1
On 7/25/07, Tim Kr?ger tim at cevis.uni-bremen.de wrote:
Dear Satish
But now, the next problem is that I am not able to use MUMPS. As
described in the manual, I start my application using
-ksp_type preonly
-pc_type lu
-mat_type aijmumps
-ksp_monitor
and I get
It appears that you never
On 7/24/07, Ben Tay zonexo at gmail.com wrote:
I am also trying to solve the NS eqns in 2d, finite volume mtd, using
fractional step formulation.
I am currently using KSPBCGS and PCILU to solve the momentum eqn matrix
and HYPRE's AMG and the default ksptype to solve the poisson eqn. Do you
Dear Lisandro,
On Mon, 23 Jul 2007, Lisandro Dalcin wrote:
On 7/23/07, Tim Kr?ger tim at cevis.uni-bremen.de wrote:
What kind of stabilization for advection and pressure are you using?
Streamline diffusion (for advection). I am not aware of the
requirement to stabilize the pressure as
Dear Tim,
I affraid that you have same memory problem while using MUMPS. I have
observed same memory problem while trying to solve some 3D Stokes
equations with MUMPS. I think the better way to solve this type of problem
is KSP with appropriate PC.
Regards,
Guy
Dear Lisandro,
On Mon, 23 Jul
On Tue, 24 Jul 2007, owner-petsc-users at mcs.anl.gov wrote:
Date: Tue, 24 Jul 2007 09:47:37 +0200 (CEST)
From: =?iso-8859-15?Q?Tim_Kr=F6ger?= tim at cevis.uni-bremen.de
X-X-Sender: tim at elektrik
To: petsc-users at mcs.anl.gov
Subject: BOUNCE petsc-users at mcs.anl.gov: Message too
Dear all,
the more KSP and PC methods are available, the more difficult it is to
choose a suitable one.
I want to compute Navier-Stokes (using Finite Elements) for
medium-sized Reynolds numbers (still laminar, though). I am currently
using
-ksp_type gmres
-ksp_gmres_restart 30
-pc_type
On 7/23/07, Tim Kr?ger tim at cevis.uni-bremen.de wrote:
Dear all,
the more KSP and PC methods are available, the more difficult it is to
choose a suitable one.
I want to compute Navier-Stokes (using Finite Elements) for
medium-sized Reynolds numbers (still laminar, though). I am currently
Dear Lissandro,
On Mon, 23 Jul 2007, Lisandro Dalcin wrote:
On 7/23/07, Tim Kr?ger tim at cevis.uni-bremen.de wrote:
the more KSP and PC methods are available, the more difficult it is to
choose a suitable one.
I want to compute Navier-Stokes (using Finite Elements) for
medium-sized
1) Until you run out of memory, I would use sparse direct like MUMPS
2) After that, as long as you have the memory I would increase the
GMRES vectors, say to 50 or 100.
3) After that I would try LGMRES which generally converges better on these
problems.
Matt
On 7/23/07, Tim Kr?ger tim
Dear Tims,
The problem is how to solve more accuretly the local problem in ASM. You
can also use KSP to solve local problem.
I think you can look how to do it with PCASMGetSubKSP().
Best Regards,
Guy
Dear gaatenek
On Mon, 23 Jul 2007, gaatenek at irisa.fr wrote:
Do you monitoring the
On 7/23/07, Tim Kr?ger tim at cevis.uni-bremen.de wrote:
Monolithic. (I am not quite sure about this word but I assume it
means that I don't try to decouple the two equations.)
That's the meaning for me (not sure if the word is completelly correct)
What kind of stabilization for advection
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