We have a Mac mini that is used for the CI, which is Xcode Server in this case. Since we updated OS X to the latest Sierra (previously it was El Capitan) and Xcode to 8.3, the fans spin up every few minutes to cool down the CPU.
A "top -o cpu" shows that it is the 'beam.smp'-process that takes over 100% of the CPU for 3-5 minutes, then doing nothing for a few minutes and it starts again.
None of the logs in /Library/Developer/XcodeServer/Logs gets updated.
Anyone observing the same behaviour? Any idea what's going on there?