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Re: distributed build limited to 6 CPUs
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Re: distributed build limited to 6 CPUs


  • Subject: Re: distributed build limited to 6 CPUs
  • From: j o a r <email@hidden>
  • Date: Fri, 28 Oct 2005 06:21:12 +0200


On 28 okt 2005, at 01.54, Mark Lentczner wrote:

The problem is that when I do a compile, it never makes use of more than six CPUs. In otherwords, there are never more than six things being compiled at once. Since everyone sees this effect, and at all times, I'm wondering if it is some built-in rate limit in either distcc, Xcode's version of distcc, or Xcode itself. Anyone have a clue?

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.


I looked through this list's archives, and the Xcode help and didn't see anything about limits or caps on distributed builds.

In the documentation you can find the user defaults key "XCMaxNumberOfDistributedTasks" that can be used to raise this limit.


j o a r



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