[petsc-users] Using superlu_dist in a direct solve

[Sanjay Govindjee]

Not sure what you mean by where is your matrix?  I am simply running ex6 
in the ksp/examples/tests directory.

The reason I ran this test is because I was seeing the same behavior 
with my finite element code (on perfectly benign problems).

Is there a built-in test that you use to check that superlu_dist is 
working properly with petsc?
i.e. something you know that works with with petsc 3.3-p5?

-sanjay


On 12/23/12 4:56 PM, Jed Brown wrote:
> Where is your matrix? It might be ending up with a very bad pivot. If 
> the problem can be reproduced, it should be reported to the 
> SuperLU_DIST developers to fix. (Note that we do not see this with 
> other matrices.) You can also try MUMPS.
>
>
> On Sun, Dec 23, 2012 at 6:48 PM, Sanjay Govindjee <s_g at berkeley.edu 
> <mailto:s_g at berkeley.edu>> wrote:
>
>     I wanted to use SuperLU Dist to perform a direct solve but seem to
>     be encountering
>     a problem.  I was wonder if this is a know issue and if there is a
>     solution for it.
>
>     The problem is easily observed using ex6.c in
>     src/ksp/ksp/examples/tests.
>
>     Out of the box: make runex6 produces a residual error of O(1e-11),
>     all is well.
>
>     I then changed the run to run on two processors and add the flag
>     -pc_factor_mat_solver_package spooles  this produces a residual
>     error of O(1e-11), all is still well.
>
>     I then switch over to -pc_factor_mat_solver_package superlu_dist
>     and the
>     residual error comes back as 22.6637!  Something seems very wrong.
>
>     My build is perfectly vanilla:
>
>     export PETSC_DIR=/Users/sg/petsc-3.3-p5/
>     export PETSC_ARCH=intel
>
>     ./configure --with-cc=icc --with-fc=ifort  \
>     -download-{spooles,parmetis,superlu_dist,prometheus,mpich,ml,hypre,metis}
>
>     make PETSC_DIR=/Users/sg/petsc-3.3-p5/ PETSC_ARCH=intel all
>     make PETSC_DIR=/Users/sg/petsc-3.3-p5/ PETSC_ARCH=intel test
>
>     -sanjay
>
>

-- 
-----------------------------------------------
Sanjay Govindjee, PhD, PE
Professor of Civil Engineering
Vice Chair for Academic Affairs

779 Davis Hall
Structural Engineering, Mechanics and Materials
Department of Civil Engineering
University of California
Berkeley, CA 94720-1710

Voice:  +1 510 642 6060
FAX:    +1 510 643 5264
s_g at berkeley.edu
http://www.ce.berkeley.edu/~sanjay
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