[petsc-users] ILUTP in PETSc

[Qin Lu]

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.pdf that 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
>
>