understanding the output from -info

[Ben Tay]

Well, I don't know what's wrong. I did the same thing for -info and it
worked. Anyway, is there any other way?

Like I can use -mat_view or call matview( ... ) to view a matrix. Is there a
similar subroutine for me to call?

Thank you.


On 2/9/07, Matthew Knepley <knepley at gmail.com> wrote:
>
> Impossible, please check the spelling, and make sure your
> command line was not truncated.
>
>   Matt
>
> On 2/9/07, Ben Tay < zonexo at gmail.com> wrote:
> >
> > ya, i did use -log_summary. but no output.....
> >
> > On 2/9/07, Barry Smith <bsmith at mcs.anl.gov> wrote:
> > >
> > >
> > > -log_summary
> > >
> > >
> > > On Fri, 9 Feb 2007, Ben Tay wrote:
> > >
> > > > Hi,
> > > >
> > > > I've tried to use log_summary but nothing came out? Did I miss out
> > > > something? It worked when I used -info...
> > > >
> > > >
> > > > On 2/9/07, Lisandro Dalcin <dalcinl at gmail.com > wrote:
> > > > >
> > > > > On 2/8/07, Ben Tay < zonexo at gmail.com> wrote:
> > > > > > i'm trying to solve my cfd code using PETSc in parallel. Besides
> > > the
> > > > > linear
> > > > > > eqns for PETSc, other parts of the code has also been
> > > parallelized using
> > > > > > MPI.
> > > > >
> > > > > Finite elements or finite differences, or what?
> > > > >
> > > > > > however i find that the parallel version of the code running on
> > > 4
> > > > > processors
> > > > > > is even slower than the sequential version.
> > > > >
> > > > > Can you monitor the convergence and iteration count of momentum
> > > and
> > > > > poisson steps?
> > > > >
> > > > >
> > > > > > in order to find out why, i've used the -info option to print
> > > out the
> > > > > > details. there are 2 linear equations being solved - momentum
> > > and
> > > > > poisson.
> > > > > > the momentum one is twice the size of the poisson. it is shown
> > > below:
> > > > >
> > > > > Can you use -log_summary command line option and send the output
> > > attached?
> > > > >
> > > > > > i saw some statements stating "seq". am i running in sequential
> > > or
> > > > > parallel
> > > > > > mode? have i preallocated too much space?
> > > > >
> > > > > It seems you are running in parallel. The "Seq" are related to
> > > local,
> > > > > internal objects. In PETSc, parallel matrices have inner
> > > sequential
> > > > > matrices.
> > > > >
> > > > > > lastly, if Ax=b, A_sta and A_end from  MatGetOwnershipRange and
> > > b_sta
> > > > > and
> > > > > > b_end from VecGetOwnershipRange should always be the same value,
> > > right?
> > > > >
> > > > > I should. If not, you are likely going to get an runtime error.
> > > > >
> > > > > Regards,
> > > > >
> > > > > --
> > > > > Lisandro Dalcín
> > > > > ---------------
> > > > > Centro Internacional de Métodos Computacionales en Ingeniería
> > > (CIMEC)
> > > > > Instituto de Desarrollo Tecnológico para la Industria Química
> > > (INTEC)
> > > > > Consejo Nacional de Investigaciones Científicas y Técnicas
> > > (CONICET)
> > > > > PTLC - Güemes 3450, (3000) Santa Fe, Argentina
> > > > > Tel/Fax: +54-(0)342-451.1594
> > > > >
> > > > >
> > > >
> >
> >
> >
>
>
> --
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> eventual
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