Jobs with large RAM usage

We have a cluster of 7 dual-processor Xeons running OpenMosix 2.4.26,
each node having 1Gb RAM. We've had this setup for almost two years now
and in general we're very happy with it.

However I have a particular job which takes up 100% of a single
processor's CPU and 70% of a node's RAM for a couple of hours. I have
had problems running more than one of these at once under OpenMosix.
Does the total RAM usage of all the jobs I am trying to run need to be
less than the RAM available to a single cluster node? I'm a bit hazy
about what goes on under the hood of OpenMosix, I'm wondering if it
tries to mirror memory addresses cluster-wide somehow, limiting things
to 1Gb in total.

Also, we are considering moving to an Opteron cluster. Is the OpenMosix
port to Opteron considered reasonably stable now?

Thanks in advance for any responses.

Tony


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