Re: [BProc] Beowulf with dual boxes policy

[Erik A. H. <er...@he...>]

On Mon, Oct 22, 2001 at 01:47:28AM +0200, J . A . Magallon wrote:
> Hi.
> 
> I am now in the process of building a beowulf system with dual SMP boxes.
> System is made with a front end and five dual boxes.
> 
> And the question is...I see two policies to follow:
> - Run one bpslave on each node, so system looks lie a 5-cpu one, and you could
>   run two jobs in parallel with no overhead

I strongly recommend this arrangement.  Running a second slave daemon
is just added overhead.  Plus, having separate slaves makes it more
difficult for things like MPI to know that they can take advantage of
shared memory, etc.

> - Run two slaves on each box, to have the system looke like a 10-cpu box.
>
> How can the second setup be configured ?

The main problem doing that is that the master expects only 1 IP per
slave.  You can get arround that by setting up an IP alias on the
slave for the second bpslave.  Then use the '-s' option to specify a
source address for the slave connection.

- Erik
-- 
Erik Arjan Hendriks          Printed On 100 Percent Recycled Electrons
er...@he...                   Contents may settle during shipment