External software help

[Ben Tay]

Hi Satish,

I've installed superlu. I issued the command ./a.out  -mat_type
superlu -ksp_type preonly -pc_type lu and it just hanged there. Is it
because I had install it with mpich? I also wanted to try umfpack and
plapack. Is it similar?

Btw, plapack 's option isn't in pg 82 of the manual.


Thank you.


On 2/12/07, Satish Balay <balay at mcs.anl.gov> wrote:
>
> On Mon, 12 Feb 2007, Ben Tay wrote:
>
> > Hi,
> >
> > I'm trying to experiment with using external solvers. I have some
> questions:
> >
> > 1. Is there any difference in speed with calling the external software
> from
> > PETSc or directly using them?
>
> There is minor conversion overhead when you use them from PETSc.
>
> >
> > 2. I tried to install MUMPS using  --download-mumps. I was prompted to
> > include --with-scalapack. After changing, I was again prompted to
> include
> > --with-blacs. I changed and again I was told the need for
> > --with-blacs-dir=<directory>. I thought I'm supposed to specify where to
> > install blacs and entered a directory. But it seems that I need to
> specify
> > the location of where blacs is. But I do not have it. So how do I solve
> > that?
>
> Mumps requires blacs & scalapack. So use:
> --download-blacs=1 --download-scalapack=1 --download-mumps=1
>
> >
> > 3. I installed some other external packages. I wanted to test their
> speed at
> > solving equations. In the manual, I was told to use the runtime option
> > -mat_type <mattype> -ksp_type preonly -pc_type <pctype> and also -help
> to
> > get help msg. However when I tried to issue ./a.out -mat_type superlu
> > -ksp_type preonly -pc_type lu, nothing happened. How should the command
> be
> > issued? I tried to get help by running ./a.out -h what appears isn't
> what I
> > want.
>
> Did you install PETSc with superlu_dist? If so use '-mat_type
> superlu_dist'
>
> [Note: superlu & superlu_dist are different packages - the first one
> is sequential - the second one is parallel]
>
> Satish
>
> >
> > Thank you very much. Regards.
> >
>
>
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