#5536: IO performance regression in 7.2 vs 7.0
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Reporter: simonmar | Owner: batterseapower
Type: bug | Status: new
Priority: high | Milestone: 7.4.1
Component: libraries/base | Version: 7.2.1
Keywords: | Testcase:
Blockedby: | Difficulty:
Os: Unknown/Multiple | Blocking:
Architecture: Unknown/Multiple | Failure: None/Unknown
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Comment(by batterseapower):
Removing the extra tests get us back to 7.0.4 performance (in fact, a bit
better) so this is indeed the source of the problem. I can't see any
further easy improvements. Perhaps we could avoid doing the
surrogatify/desurrogatify steps in writeBlocks/unpack for a corresponding
Handle in binary mode. Then when switching from binary to non-binary mode
and vice-versa we would need to do the correct transformation to fix up
any buffered characters.
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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5536#comment:6>
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