[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 think it would be a good approach to keep the current delay, but to
 insert some kind of conditional around actually running the full GC. This
 condition could take into account e.g.:
 - The time since the last (actually-performed) idle GC. This would reset
 if a non-idle full GC is performed.
 - The number of bytes collected by the last idle GC, perhaps in relation
 to the residency. (If you collect less than 10% of heap as garbage, it is
 probably not worth to run the GC too often).
 - The number of bytes allocated since the last full GC (idle or not).

 I don't know if these statistics are available, but at least the first
 should be easy to implement.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13164#comment:2>
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