[Beowulf] Problems with a JS21 - Ah, the networking...

[Bruce Allen]

> The myrinet connection was working right, but sometimes a user program 
> just got stuck - one of the processes was sleeping, and all others were 
> running. Then, the program hangs.
>
> Any suggestions? I can provide any log necessary.

Ivan, you probably already know this, but if not it can be very useful. If 
your cluster is Linux based, then you can often use the 'strace' utility 
on the stuck user program to understand why it is sleeping, for example 
what message is it waiting for that is not arriving.  This might help you 
in diagnosing the problem.

Cheers,
 	Bruce
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