#3039: strange space usage
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Reporter: igloo | Owner:
Type: run-time performance bug | Status: new
Priority: normal | Milestone:
Component: Compiler | Version: 6.10.1
Severity: normal | Resolution:
Keywords: | Difficulty: Unknown
Testcase: | Os: Unknown/Multiple
Architecture: Unknown/Multiple |
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Comment (by simonmar):
Running the two versions of the program with +RTS -hT (no profiling) show
identical heap profiles. Most of the stuff in the heap is Handles and
Handle-related things. It looks like we're retaining quite a few Handles,
perhaps because the finalizers take a while to run (the Handles are
closed, but still in memory until the finalizer has run). The reason we
have lots of retained list data that belongs to `f` is because each Handle
contains its filename, and the filename was generated by `f`.
Why it apparently goes away when inlining `g`, I've no idea. Could just
random scheduling behaviour, perhaps all the finalizers are running
earlier. Or it could be a profiling bug.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3039#comment:2>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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