[GHC] #13164: idle time full GCs (idle cpu usage)

[GHC]

#13164: idle time full GCs (idle cpu usage)
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        Reporter:  lspitzner         |                Owner:
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Runtime System    |              Version:  8.0.1
      Resolution:                    |             Keywords:  idle GC
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by lspitzner):

 I just noticed that this means that you do not get deadlock detection if
 you forkIO (forever (threadDelay 100000)). That's interesting.

 You are right, I was focused on GC performance instead of deadlock
 detection because the latter was not even mentioned when i chatted with
 rwbarton. Maybe he can comment on this.

 Even for deadlock detection it makes sense to delay things based on the
 cost of the full GCs. (I'd rather have to wait 15secs to get the deadlock
 detected when I manage to create deadlocks than constantly be wasting CPU
 time - but if full GCs are cheap, I would not mind quicker detection.)

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13164#comment:4>
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