#4225: RTS -i (heap profiling interval) documentation could be clearer
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Reporter: ClaudiusMaximus | Owner:
Type: bug | Status: new
Priority: normal | Component: Profiling
Version: 6.12.3 | Keywords:
Os: Unknown/Multiple | Testcase:
Architecture: Unknown/Multiple | Failure: Documentation bug
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Changes (by ClaudiusMaximus):
* failure: None/Unknown => Documentation bug
* type: feature request => bug
Comment:
Ok, I've done some brief testing and it seems that not specifying -i at
all does give much saner behaviour of census at naturally-occuring GC
(though, -s reports around 75 samples and the .hp has fewer, around 57
samples).
Perhaps when the documentation is updated to clarify this point there
should be an additional note warning that specifying -i will force
additional GC which might affect program behaviour?
Thanks for aiding my understanding of all this :)
PS: I found a link to this page but it does not yet contain any
information:
http://hackage.haskell.org/trac/ghc/wiki/Commentary/Profiling/Heap
linked from:
http://hackage.haskell.org/trac/ghc/wiki/Commentary/Rts/Storage/Slop
(which implies that census requires a freshly GC'd heap)
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4225#comment:5>
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