Opening Console, you’ll see the ceaseless spew from a cornucopia of processes, including many I never want, and will never use. It might be ‘quiet’ at times, but what I’ve found is that a number of Apple services get triggered from time to time to go into a state of endless bitching and moaning, often with messages that equate to “fix this bug someday”.
For example, here is this lovely new Apple bug involving touchui. On a Mac Pro no touch user interface exists, but the engineers at Apple don’t bother to test much any more, so the com.apple.nowplayingtouchui apparently is just going to fail forever.
The spew has been getting worse the last few versions of macOS, and it’s also more of a problem with 10.12 and its new logging subsystem. I’m running into more cases of runaway logging where the same message is repeated multiple times per second. Not only does this hog the CPU, but Console falls behind so that (even with a filter to hide the spew) it can take minutes for actual, relevant log entries to show up. The only remedy seems to be to restart the Mac.
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