#4801: Typechecker performance regression 6.12 -> 7.0.1 --------------------------------------------+------------------------------ Reporter: simonmar | Owner: simonpj Type: bug | Status: closed Priority: high | Milestone: 7.0.2 Component: Compiler (Type checker) | Version: 7.0.1 Resolution: fixed | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: None/Unknown | Unknown/Multiple Test Case: perf/compiler/T4801 | Difficulty: Unknown Blocking: | Blocked By: | Related Tickets: --------------------------------------------+------------------------------ Changes (by goldfire): * difficulty: => Unknown Comment: The test T4801 is sometimes failing with "stat too good". I know Jan Stolarek was looking into this over the summer. Here are my numbers from MacOS 10.7.5 (x86_64): {{{ max_bytes_used value is too high: Expected max_bytes_used: 21657520 +/-5% Lower bound max_bytes_used: 20574644 Upper bound max_bytes_used: 22740396 Actual max_bytes_used: 26596432 peak_megabytes_allocated value is too high: Expected peak_megabytes_allocated: 58 +/-1% Lower bound peak_megabytes_allocated: 57 Upper bound peak_megabytes_allocated: 59 Actual peak_megabytes_allocated: 72 bytes allocated value is too low: (If this is because you have improved GHC, please update the test so that GHC doesn't regress again) Expected bytes allocated: 510938976 +/-5% Lower bound bytes allocated: 485392027 Upper bound bytes allocated: 536485925 Actual bytes allocated: 458701280 *** unexpected failure for T4801(normal) }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/4801#comment:6 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler