#3518: GHC GC rises greatly on -N8 compared to -N7
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Reporter: nccb | Owner:
Type: run-time performance bug | Status: new
Priority: normal | Milestone:
Component: Runtime System | Version: 6.10.4
Severity: normal | Resolution:
Keywords: | Testcase:
Os: Linux | Architecture: x86
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Comment (by NeilMitchell):
I've seen this too. At -N8 some extra parallelism kicks in with the
garbage collector, which destroys everything. The parallel GC in 6.12 is
far better, so this issue will be obsolete then.
Until then, I always pass {{{-N8 -g1}}} which turns off parallel GC and
makes everything much faster again.
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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3518#comment:1>
GHC <http://www.haskell.org/ghc/>
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