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PVM jobs involve a certain of network traffic, especially sending
multi-conformer molecules from the slaves back to the master.
Omega slave jobs are relatively fast compared to the network I/O time,
so for scaling beyond 32 CPUs, additional effort is required in
setting up a job. For low numbers of CPUs or for divide-and-conquer
style applications, using .oeb.gz as the output file format is
fine.
As of version 2.0, Omega can write rotor-offset-compressed OEB files (via
the -roc command-line flag) that greatly reduce the I/O on the master
and allow downstream applications such as ROCS and Fred to scale to larger
number of CPUs.
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