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!
Cheers,
Erik
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