#3408: idle GC causes large CPU usage if run more frequently than 1 second
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Reporter: JeremyShaw | Owner: simonmar
Type: bug | Status: new
Priority: normal | Milestone: 6.12 branch
Component: Runtime System | Version: 6.10.4
Severity: normal | Resolution:
Keywords: idle GC | Difficulty: Unknown
Testcase: | Os: Linux
Architecture: Unknown/Multiple |
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Changes (by robgreayer):
* cc: [email protected] (added)
Comment:
Perhaps related ... I've noticed a problem running GHCi on Windows; after
loading a fairly complex set of modules, the 'idle' CPU usage of GHC can
be quite high. After seeing this bug report, I tried setting the idle GC
time to something other than its default, (e.g. ghci.exe +RTS -I1 -RTS
...) and the 'idle' CPU usage drops to 0.
With idle GC = 0.3 (or unset), after initialization GHCi's idle CPU usage
is about 2%.
After loading a test case (Main module of frag-1.1.2, from hackage), it
hovers at 15%-25%.
With idle GC set to 1, in both cases idle CPU usage is 0%.
(This is on XP SP2, Intel Core 2 Duo CPU 2.2Ghz).
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3408#comment:3>
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The Glasgow Haskell Compiler
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