[petsc-users] about BDDC preconditioner

[Stefano Zampini]

ex45 uses DMDA, so it cannot be used to test for PCBDDC. Instead, after
configuring -with-pcbddc=1, you can
use src/ksp/ksp/examples/tutorials/ex59.c (Laplacian discretized with
spectral elements)




2013/6/13 Jed Brown <jedbrown at mcs.anl.gov>

> "Zhenglun (Alan) Wei" <zhenglun.wei at gmail.com> writes:
>
> > Dear All,
> > I hope you're having a nice day.
> > I'm trying to use BDDC as a preconditioner. The executable command is:
> > /mpiexec -np 8 ./ex45 -pc_type bddc -ksp_type cg -ksp_rtol 1.0e-7
> > -log_summary//
>
> This example does not assemble in MATIS format, so it cannot be used
> with BDDC.
>
> > ///However, it say:
> > /[//0]PETSC ERROR: --------------------- Error Message
> > ------------------------------------//
> > //[0]PETSC ERROR: Unknown type. Check for miss-spelling or missing
> > external package needed for type://
> > //see
> > http://www.mcs.anl.gov/petsc/documentation/installation.html#external!//
> > //[0]PETSC ERROR: Unable to find requested PC type bddc!//
>
> Configure --with-pcbddc.
>
> This will be enabled by default soon.
>



-- 

Ph. D. Stefano Zampini
CINECA
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