warn message in log summary

[Lisandro Dalcin]

On 11/24/07, Barry Smith <bsmith at mcs.anl.gov> wrote:
> > To minor question about this message:
> > * What means 'to rapid calls'?  Is it a typo? Should be 'too rapid
> > calls' ?
> Yup
> > * Perhaps a newline could be added after the warn mesage?
> Yup

Then I'll fix the formating.

> I hate this message and problem, I wish there was a real fix.

Perhaps PETSc should use MPI_Wtime as default timer. If a better one
is available, then use it. But then MPIUNI have to also provide an
useful, default implementation.

Runing a simple test, like this (MPICH2):

int main(void)
{
  int i;
  double t0[100],t1[100];
  MPI_Init(0,0);
  for (i=0; i<100; i++) {
    t0[i] = MPI_Wtime();
    t1[i] = MPI_Wtime();
  }
  for (i=0; i< 100; i++) {
    printf("t0=%e, t1=%e, dt=%e\n",t0[i],t1[i],t1[i]-t0[i]);
  }
  MPI_Finalize();
  return 0;
}

and in the SAME box I get the PETSc warning, it consistently gives me
positive time deltas of the order of MPI_Wtick()...



> >
> >
> >
> > --
> > 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
> >
>
>


-- 
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