On Wed, 2006-02-15 at 14:18 +0100, rtichy_at_[hidden] wrote:
> Hi,
>
> Quoting Esteban Fiallos <erf008_at_[hidden]>:
>
> > Well, it depends on what your program is supposed to do. If, for
> > instance, you are performing a send and receive operation that
> > requires more than one processor, then the program will crash.
>
> It does exactly this... rank 0 id the 'master', rank 1 is the 'foreman' and all
> higher ranks are workers. Messages are sent to different agents depending on
> their rank. Is there any way to force lam to asign different ranks on one
> processor?
>
> -Rich
My non-expert understanding is that each process has a different rank,
regardless of what processor they are on.
I don't think lam should crash just because everything is on one
processor.
The program could lock up if you've made some timing assumptions that
are exposed by everything being on one processor.
When communicating within the same box lam can use different methods
(e.g., shared memory) than it would use between boxes. Possibly there
is a bug in that code, it's misconfigured, or you need to set an option.
I think some of the ssi options control this.
Ross Boylan
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