Re: Run-time error: A timestep of size zero was assigned

From: Hugo Vicente Capelato <hugo_at_das.inpe.br>
Date: Fri, 9 Jun 2006 09:00:49 -0300

Dear Ives

Thank you for your answer. The problem is that this error
is coming intermittently and, seemingly, more and more frequently.

Restarting Gadget from the point it stopped makes it goes somewhat
further in time, but after while it stops again with the same error,
but not for the same particle as, for instance, like this:

=====================
Begin Step 52398, Time: 0.190878, Systemstep: 4.76837e-06
domain decomposition...
NTopleaves= 2360
work-load balance=1.3816 memory-balance=1.754
exchange of 0000017839 particles
domain decomposition done.
begin Peano-Hilbert order...
Peano-Hilbert done.
Start force computation...

Error: A timestep of size zero was assigned on the integer timeline!
We better stop.
Task=14 Part-ID=372839 dt=nan tibase=3.72529e-08 ti_step=-2147483648 ac=nan
xyz=(-194.79|219.205|427.333) tree=(nan|nannan)

Tree construction.
Tree construction done.
Begin tree force.
tree is done.
=======================

However it is seems to be always the same "Task=14" which, I suppose,
corresponds to certain node of the cluster. I am suspecting of a
hardware problem... What do you think ?

Cheers, Hugo

Quoting Yves Revaz <yves.revaz_at_obs.unige.ch>:

>
> Dear Hugo,
>
> This means that the timestep for particle 346505 computed by get_timestep()
> is equal to zero or is not a number (nan), which should not occure.
> In this case the program is of course stopped.
>
> In you case, the log also says "ac=nan" which is not very nice...
> This is probably due to zero division or overflow during force computation.
>
> Regards.
>
>
>
> >
> >
> > Error: A timestep of size zero was assigned on the integer timeline!
> > We better stop.
> > Task=14 Part-ID=346505 dt=nan tibase=3.72529e-08 ti_step=-2147483648
> > ac=nan xyz=
> > (-199.269|226.042|432.335) tree=(nan|nannan)
> >
> >
> >
>
>
> --
> (o o)
> --------------------------------------------oOO--(_)--OOo-------
> Yves Revaz
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> FRANCE
> ----------------------------------------------------------------
>
>
>
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-- 
HUGO VICENTE CAPELATO			  
Divisao de Astrofisica			
Instituto Nacional de Pesquisas Espaciais
Av. dos Astronautas, 1758
12.227-010 Sao Jose dos Campos
Phone numbers:
 at INPE : 55 12 3945-7207 /-7200 /-6804
     fax : 55 12 3945-6811
 at IAG  : 55 11 3091-2706
 at home : 55 11 3726-2793
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e-mail: hugo-at-das.inpe.br,hugo-at-astro.iag.usp.br
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Received on 2006-06-09 14:21:31

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