[StarCluster] note for usage

[Boris Fain]

This may be useful to everyone. When launching a cluster on Amazon, if you
have a lot of processes writing to a shared EBS volume
NFS does become a bottleneck. Everyone's output is different, so everyone
will have to figure out their own limits. In our case we had to
limit the head node compute load to 2/8 - it simply could not handle more.
We have 12 8-core (xlarge high-cpu) instances, and there's quite
a bit of writing from each MPI thread.

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b.
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