[petsc-users] ILUTP in PETSc

[Qin Lu]

I tried to use command line options as the example suggested ('-ksp_type preonly -pc_type ilu -pc_factor_mat_solver_package superlu -mat_superlu_ilu_droptol 1.e-8') without changing my source code, but then the call to KSPSetUp returned error number 56.
 
Does this mean I still need to change the source code (such as adding calls to PCFactorSetMatSolverPackage, PCFactorGetMatrix, etc.)in addition to the command line options?
 
I ask this since the use of SuperLU seems to be different from using Hypre, which can be invoked with command line options without changing source code.
 
Thanks a lot,
Qin 


----- Original Message -----
From: Barry Smith <bsmith at mcs.anl.gov>
To: Qin Lu <lu_qin_2000 at yahoo.com>
Cc: Xiaoye S. Li <xsli at lbl.gov>; "petsc-users at mcs.anl.gov" <petsc-users at mcs.anl.gov>
Sent: Monday, May 12, 2014 5:11 PM
Subject: Re: [petsc-users] ILUTP in PETSc


   See for example: http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/Mat/MATSOLVERSUPERLU.html





On May 12, 2014, at 4:54 PM, Qin Lu <lu_qin_2000 at yahoo.com> wrote:

> Hello,
> 
> I have built PETSc with SuperLU, but what are PETSc's command line options to invoke SuperLU's ILUTP preconditioner and to set the dropping tolerance? (-mat_superlu_ilu_droptol for the latter?)
>  
> Do I need to do some programming in order to call SuperLU's preconditioner, or the command line options would work?  
>  
> Many thanks,
> Qin  
> 
> 
>  From: Xiaoye S. Li <xsli at lbl.gov>
> To: Barry Smith <bsmith at mcs.anl.gov> 
> Cc: Qin Lu <lu_qin_2000 at yahoo.com>; "petsc-users at mcs.anl.gov" <petsc-users at mcs.anl.gov> 
> Sent: Friday, May 2, 2014 3:40 PM
> Subject: Re: [petsc-users] ILUTP in PETSc
> 
> 
> 
> The sequential SuperLU has ILUTP implementation, not in parallel versions. PETSc already supports the option of using SuperLU, so you should be able to try easily.  
> 
> In SuperLU distribution:
> 
>   EXAMPLE/zitersol.c : an example to use GMRES with ILUTP preconditioner (returned from driver SRC/zgsisx.c)
> 
>   SRC/zgsitrf.c : the actual ILUTP factorization routine
> 
> 
> Sherry Li
> 
> 
> 
> On Fri, May 2, 2014 at 12:25 PM, Barry Smith <bsmith at mcs.anl.gov> wrote:
> 
> 
>> At http://www.mcs.anl.gov/petsc/documentation/linearsolvertable.html there are two listed. ./configure —download-hypre
>> 
>> mpiexec -n 23 ./yourprogram -pc_type hypre -pc_hypre_type ilupt or euclid
>> 
>> you can also add -help to see what options are available.
>> 
>>   Both pretty much suck and I can’t image much reason for using them.
>> 
>>    Barry
>> 
>> 
>> 
>> On May 2, 2014, at 10:27 AM, Qin Lu <lu_qin_2000 at yahoo.com> wrote:
>> 
>>> Hello,
>>> 
>>> I am interested in using ILUTP preconditioner with PETSc linear solver. There is an online doc https://fs.hlrs.de/projects/par/par_prog_ws/pdf/petsc_nersc01_short.pdfthat mentioned it is available in PETSc with other packages (page 62-63). Is there any instructions or examples on how to use it?
>>> 
>>> Many thanks,
>>> Qin
>> 
>>