Re: [pooma-dev] parallel particle bctest3 crash

[Richard Guenther <rguenth@xxxxxxxxxxxxxxxxxxxxxxxxxxx>]

Arno Candel wrote:
> > This is no wonder:
> >
> >   if (Pooma::context() == 0)
> >     P.create(10,0,false);
> >   P.sync(P.a1);
> >
> > i.e. we create 10 particles - distributing over 11 contexts isn't 
> > going to work.  We don't handle contexts with zero particles 
> > gracefully.  I think there are similar problems with #patches < 
> > #contexts.  But I'd qualify these cases as user error.
> > Hope this helps,
> > Richard.
> Unfortunately, that's not the problem. It still doesn't work after 
> creating 11 or more particles.
Hm ok, that was just a guess.

> I've been using position-dependent distribution of particles for months 
> now in my own code, often with many contexts not containing any 
> particles. The problem only arises when the number of contexts is 
> getting too high (mostly 8-10 being the limit). However, I have no idea 
> what triggers the error...
I don't have time at the moment to dig into this myself, maybe you can 
try to debug this yourself - usually doing printf-debugging is the only 
way to debug these parallel failures though (unless you have expensive 
tools around, which I don't have).
Richard.