[petsc-users] with hypre

[Mark F. Adams]

For GAMG you can use ex54, ex55, ex54f, ex56:

cd src/ksp/ksp/examples/tutorials
make ex56
make runex56

Mark

On Aug 3, 2012, at 9:12 AM, Amneet Bhalla wrote:

> Thanks Matt for a quick reply.
> 
> Attached is the Makefile I used for building ex9. I used the same Makefile provided by  hypre. I just changed the 
> path of hypre's directory. Also attached is the command and full output I got. Using the same Makefile I was able to
> build and run ex1, ex2, ex3 and ex4 of hypre.
> 
> Can you point me to PETSc's examples of AMG, ML or GAMG?
> 
> On Fri, Aug 3, 2012 at 7:47 AM, Matthew Knepley <knepley at gmail.com> wrote:
> On Fri, Aug 3, 2012 at 7:28 AM, Amneet Bhalla <mail2amneet at gmail.com> wrote:
> Hi All, 
> 
> I am trying to solve system of PDEs on AMR grid. I using PETSc 's Krylov solver for that. This requires me
> to use a FAC preconditioner with a non-Krylov solver for the level 0. I actually tried PETSc's Krylov Solver
> for level 0 (by building  MPIAIJ Mat and Vec), but it does not really improve the convergence rate. So I believe
> I will have to use a multigrid solver for level 0. Can I use my already built PETSc Mat and Vec and call multigrid solvers from PETSc?  
> 
> Use AMG to start here since it is easy. You can either use ML or GAMG (which is builtin) to start, or Hypre if
> you straighten out the link (likely broken from not using the makefiles).
>  
> If thats not possible, I am planning to use hypre's "SysPFMG" to write a multigrid solver for level 0. 
> I have installed PETSc with hypre by using --download-hypre=1 option.  I can build and run many 
> examples in PETSC_ARCH/externalpackages/hypre-2.7.0b/src/examples/ but not ex9; which is the
> closest I could find for my purpose.
> http://acts.nersc.gov/hypre/example09/ex9.c.html
> 
>  I am getting some linkage error like
> 
> Always send the entire output, including the command that was run. I have no idea what file you are trying to
> compile here. Does the example work?
> 
>    Matt
>  
> $HOME/SOFTWARES/LIBRARIES/PETSc/linux/lib/libHYPRE.a(par_gsmg.o): In function `hypre_BoomerAMGFitVectors':
> $HOME/SOFTWARES/LIBRARIES/PETSc/externalpackages/hypre-2.7.0b/src/parcsr_ls/par_gsmg.c:735: undefined reference to `dgels_'
> $HOME/SOFTWARES/LIBRARIES/PETSc/linux/lib/libHYPRE.a(par_relax.o): In function `hypre_BoomerAMGRelax':
> $HOME/SOFTWARES/LIBRARIES/PETSc/externalpackages/hypre-2.7.0b/src/parcsr_ls/par_relax.c:3135: undefined reference to `dgetrf_'
> $HOME/SOFTWARES/LIBRARIES/PETSc/externalpackages/hypre-2.7.0b/src/parcsr_ls/par_relax.c:3146: undefined reference to `dgetrs_'
> $HOME/SOFTWARES/LIBRARIES/PETSc/linux/lib/libHYPRE.a(schwarz.o): In function `hypre_AMGNodalSchwarzSmoother':
> $HOME/SOFTWARES/LIBRARIES/PETSc/externalpackages/hypre-2.7.0b/src/parcsr_ls/schwarz.c:312: undefined reference to `dpotrf_'
> 
> Any help will be appreciated.
> 
> Thanks,
> -- 
> Amneet 
> 
> 
> 
> 
> 
> 
> 
> -- 
> 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
> 
> 
> 
> -- 
> Amneet 
> 
> 
> 
> 
> <commandToRun><Makefile>

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