On 7/24/2007 5:16 PM, Erik Lindahl wrote:
Hi,
I agree with you about the GbE sharing between 4 cores degardes the
performance. Fortunately, every Cluster node has two GbE ports. I
want to know, can I configure lamd in such a manner that every processor
on every node (with two cores) uses one of these ports for its
communication purposes? And if this is possible, could you please
give me
some hints or guidance to start this configuration on the cluster?
And finally, can you expect any scalability improvements by taking this
approach?
Built-in network cards are usually of lower quality, so there's
probably only a single processor controlling both ports, and since the
card probably only has a single driver requests might even be serialized.
If you have lots of available ports on your gigabit switches and both
switches+cards support "port trunking" you could try to connect two
cables to each node and get a virtual 2Gb bandwidth connection. For
more advanced stuff you'll have to consult the lam-mpi mailing list,
although I'd be (quite pleasantly) surprised if it's possible to tweak
gigabit performance a lot!
I used this in our cluster. It's call bonding in some places. Redhat has
documented it for its Enterprise Linux (docs are freely available) And
there are a lot to be found.
Cheers,
Erik
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