understanding the output from -info

[Matthew Knepley]

Problems do not go away by ignoring them. Something is wrong here, and it
may
affect the rest of your program. Please try to run an example:

  cd src/ksp/ksp/examples/tutorials
  make ex2
  ./ex2 -log_summary

     Matt

On 2/9/07, Ben Tay <zonexo at gmail.com> wrote:
>
> 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
> > > > > >
> > > > > >
> > > > >
> > >
> > >
> > >
> >
> >
> > --
> > One trouble is that despite this system, anyone who reads journals
> > widely
> > and critically is forced to realize that there are scarcely any bars to
> > eventual
> > publication. There seems to be no study too fragmented, no hypothesis
> > too
> > trivial, no literature citation too biased or too egotistical, no design
> > too
> > warped, no methodology too bungled, no presentation of results too
> > inaccurate, too obscure, and too contradictory, no analysis too
> > self-serving,
> > no argument too circular, no conclusions too trifling or too
> > unjustified, and
> > no grammar and syntax too offensive for a paper to end up in print. --
> > Drummond Rennie
>
>
>


-- 
One trouble is that despite this system, anyone who reads journals widely
and critically is forced to realize that there are scarcely any bars to
eventual
publication. There seems to be no study too fragmented, no hypothesis too
trivial, no literature citation too biased or too egotistical, no design too
warped, no methodology too bungled, no presentation of results too
inaccurate, too obscure, and too contradictory, no analysis too
self-serving,
no argument too circular, no conclusions too trifling or too unjustified,
and
no grammar and syntax too offensive for a paper to end up in print. --
Drummond Rennie
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20070209/f99fb87e/attachment.htm>