[petsc-users] How rto use multigrid?

[Alexander Grayver]

On 29.10.2012 13:49, w_ang_temp wrote:
> Hello, Jed
> I use the command:
> mpiexec -n 4 ./ex4f -ksp_type cgs -pc_type gamg -pc_gamg_agg_nsmooths 
> 1 -ksp_rtol 1.0e-15 -ksp_converged_reason
> The error is as follows:
> [0]PETSC ERROR: --------------------- Error Message 
> ------------------------------------
> [0]PETSC ERROR: Unknown type. Check for miss-spelling or missing 
> external package needed for type
> seehttp://www.mcs.anl.gov/petsc/petsc-as/documentation/installation.html#external!
> [0]PETSC ERROR: Unable to find requested PC type gamg!
> [0]PETSC ERROR: 
> ------------------------------------------------------------------------
> *[0]PETSC ERROR: Petsc Release Version 3.2.0, Patch 7, Thu Mar 15 
> 09:30:51 CDT 2012 *

You should use petsc-3.3-p3.



> [0]PETSC ERROR: See docs/changes/index.html for recent updates.
> [0]PETSC ERROR: See docs/faq.html for hints about trouble shooting.
> [0]PETSC ERROR: See docs/index.html for manual pages.
> [0]PETSC ERROR: 
> ------------------------------------------------------------------------
> [0]PETSC ERROR: ./ex4f on a arch-linu named ubuntu by geo Mon Oct 29 
> 05:40:13 2012
> [0]PETSC ERROR: Libraries linked from /home 
> /geo/soft/petsc/petsc-3.2-p7/arch-linux2-c-opt/lib
> [0]PETSC ERROR: Configure run at Mon Jul 2 20:33:17 2012
> [0]PETSC ERROR: Configure options --with-mpi-dir=/home/geo/soft/mpich2 
> --download-f-blas-lapack=1 --with-x=1 --with-debugging=0 
> --download-parmetis --download-mumps --download-scalapack --download-blacs
> [0]PETSC ERROR: 
> ------------------------------------------------------------------------
> [0]PETSC ERROR: PCSetType() line 67 in src/ksp/pc/interface/pcset.c
> [0]PETSC ERROR: PCSetFromOptions() line 184 in 
> src/ksp/pc/interface/pcset.c
> [0]PETSC ERROR: KSPSetFromOptions() line 286 in 
> src/ksp/ksp/interface/itcl.c
> When I use 'mpiexec -n 4 ./ex4f -ksp_type cgs -pc_type sor -ksp_rtol 
> 1.0e-15 -ksp_converged_reason', it is ok. So
> what is the possible reason?
> Thanks.
> Jim
>


-- 
Regards,
Alexander

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