It's the default max limit, as imposed by Xcode. It was determined
that using more than that would give worse results - based on how
taxing it is for the local machine to feed the remote machines data.
That said, in my own tests I can see improvements to build times
well beyond this point - but it all comes down to the combination
of network equipment + build machines that you have available.
Joar is correct. The limit of 6 is a bit on the conservative side,
but that was a purposeful decision. Unfortunately, distcc's
performance does not degrade gracefully once the maximum number of
processes has been exceeded. Too high and all of the local
preprocessing tends to crush the local machine's will to live.
I would suggest trying different numbers and timing some builds.
b.bum
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