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The "garbage-collection statistics" RTS options can be useful for
seeing what parallel programs are doing. If you do either
`+RTS -Sstderr' or `+RTS -sstderr', then
you'll get mutator, garbage-collection, etc., times on standard
error. The standard error of all PE's other than the `main thread'
appears in `/tmp/pvml.nnn', courtesy of PVM.
Whether doing `+RTS -Sstderr' or not, a handy way to watch
what's happening overall is: `tail -f /tmp/pvml.nnn'.
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