#4322: High CPU usage during idle time due to GC
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Reporter: hesselink | Owner:
Type: bug | Status: closed
Priority: normal | Milestone:
Component: Runtime System | Version: 6.12.3
Resolution: invalid | Keywords: idle GC
Testcase: | Blockedby:
Difficulty: | Os: MacOS X
Blocking: | Architecture: x86
Failure: Runtime performance bug |
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Comment(by simonmar):
If you search for "deadlocked" in the log, you can see where the idle GCs
happen.
* line 26335, we've just finished a GC (16.0s).
* line 26338, the IO manager thread wakes up thread 30 (16.27s).
* line 26417, we do an idle GC (16.59s).
So the idle GC happens roughly 0.3s after the last activity, which is
correct.
From around this point I see the idle GCs happening once per second, as we
expect.
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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4322#comment:9>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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