[petsc-users] Strange error(?) message

[Mohammad Mirzadeh]

Barry,

Thanks a lot; I should definitely learn to use the debugger.

I'm not sure what makes the graph "ill-formed" in ParMetis terminology.
I'll keep looking into their manual to see if I can find anything. What
makes this even harder is the code runs fine for certain grids and then
this just happens as I refine the grid. I'll look into the function where I
set up the adjacency matrix to see if I'm doing something wrong ...

I'll keep you posted.



On Mon, Apr 9, 2012 at 8:25 PM, Barry Smith <bsmith at mcs.anl.gov> wrote:

>
>  This is part of the excellent error handing in ParMetis (sarcasm
> intended), you would have found it rather quickly in the debugger.
> (ParMetis code follows)
>
> idx_t BSearch(idx_t n, idx_t *array, idx_t key)
> {
>  idx_t a=0, b=n, c;
>
>  while (b-a > 8) {
>    c = (a+b)>>1;
>    if (array[c] > key)
>      b = c;
>    else
>      a = c;
>  }
>
>  for (c=a; c<b; c++) {
>    if (array[c] == key)
>      return c;
>  }
>
>  errexit("Key %"PRIDX" not found!\n", key);
>
>  return 0;
> }
>
>  So either it is a bug in ParMetis or ParMetis is being passed a
> "ill-formed" graph and not detecting the "ill-formed" graph cleanly.
>
>   What to do? Well we can't spend out lives debugging other peoples
> libraries so ..... I am not sure what to do next? Validate that Parmetis is
> getting reasonable input?
>
>   Barry
>
>
> On Apr 9, 2012, at 10:19 PM, Mohammad Mirzadeh wrote:
>
> > -on_error_attach_debugger does not start the debugger. I traced it upto
> the following call:  MatPartitioningApply(). It runs fine up until that
> function call and then gives the error.
> >
> > Also, to make things even look more weird, I got the following once I
> was running it:
> >
> > Key 10176 not found!
> > INTERNAL ERROR: Invalid error class (66) encountered while returning from
> > PMPI_Waitall.  Please file a bug report.
> >
> > Do you happen to know what that could mean? The funny thing is, it only
> happened once!
> >
> > On Mon, Apr 9, 2012 at 7:57 PM, Jed Brown <jedbrown at mcs.anl.gov> wrote:
> > On Mon, Apr 9, 2012 at 21:56, Mohammad Mirzadeh <mirzadeh at gmail.com>
> wrote:
> > :( that's all I see. Do you mean running with -on_error_attach_debugger?
> >
> > Sure, or directly in a debugger. Does execution make it to main?
> Something is either not catching errors or is improperly calling exit() or
> similar.
> >
>
>
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