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Re: Hypre
- To: petsc-users@xxxxxxxxxxx
- Subject: Re: Hypre
- From: "Matthew Knepley" <knepley@xxxxxxxxx>
- Date: Thu, 17 Apr 2008 07:01:34 -0500
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- In-reply-to: <20080417122313.ws2qnzcgg8co480w@email.ee.ethz.ch>
- References: <20080417122313.ws2qnzcgg8co480w@email.ee.ethz.ch>
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On Thu, Apr 17, 2008 at 5:23 AM, <tribur@xxxxxxxxxxxxxxxxx> wrote:
> Dear Petsc experts,
>
> Another, more basic problem when using Hypre:
>
> When I try
>
> ex2_hdf5 -f data/sphereInBlockFiner_a_cd3t.h5 -pc_type hypre -pc_hypre_type
> pilut -log_summary
>
> where sphereInBlock_a_cd3t.h5 contains a 102464 x 102464 matrix,
> the program seems to hang (it stops with the error "=>> PBS: job killed:
> walltime 384 exceeded limit 360").
> Adding the option -ksp_max_it 1 to be sure that it is not iterating until
> 10000000000000 doesn't change anything. The same happens also if I use
> -pc_hypre_type boomeramg.
If you really think it is hanging, I would attach gdb and get a stack
trace. You can
either run with -start_in_debugger, or attach gdb to the running process with
gdb <process id>. It is conceivable to me that pilut just takes a
really long time
to factor the matrix. For boomeramg this is less likely, but still believeable.
Matt
> It is neither the problem of my program nor of the matrix, because
>
> ex2_hdf5 -f data/sphereInBlockFiner_a_cd3t.h5 -pc_type jacobi -log_summary
> -ksp_rtol 0.0000000001
>
> takes only 5s and gives me the correct solution.
>
> What do I do wrong?
>
> Looking forward to your answer,
> Kathrin
>
>
--
What most experimenters take for granted before they begin their
experiments is infinitely more interesting than any results to which
their experiments lead.
-- Norbert Wiener