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From: Reuti (reuti_at_[hidden])
Date: 2006-06-19 15:30:55


Am 19.06.2006 um 20:02 schrieb Michael Kluskens:

> How does OpenMPI auto-detect available hosts?
>
> I'm running on a cluster of dual-opterons running Debian Linux.
>
> Just using "mpirun -np 4 hostname" somehow OpenMPI located the second
> dual-opteron in the stack of machines but no more than that,
> regardless of how many processes I asked for.
>
> The master node has an internal ip of 10.0.0.0 and the second node
> has an ip of 10.0.0.1 and a name of "node02" and "node2"

I would suggest not to use .0 at all as a host address, as it usually
refers to a subnet by convention. And having it in the same order as
the name, avoids the offset. I mean .1 = node01, .2 = node02...

I don't know, whether this is related in any way to the effect you
observe.

Cheers - Reuti

> I've been unable to find a file that contains only the name of my
> second node and not the others.
>
> I'm currently running OpenMPI 1.2a1r10297.
>
> Michael
>
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