understanding the output from -info

[Ben Tay]

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
> > >
> > >
> >
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20070209/16a9c0d7/attachment.htm>