#11564: Possible overzealous unfolding -------------------------------------+------------------------------------- Reporter: simonmar | Owner: Type: bug | Status: new Priority: high | Milestone: Component: Compiler | Version: 8.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Phab:D1900 Wiki Page: | -------------------------------------+------------------------------------- Comment (by simonmar): I tried this again, the results are a bit different: {{{ bytes allocated value is too high: Expected T5631(normal) bytes allocated: 1124068664 +/-5% Lower bound T5631(normal) bytes allocated: 1067865230 Upper bound T5631(normal) bytes allocated: 1180272098 Actual T5631(normal) bytes allocated: 1384316488 Deviation T5631(normal) bytes allocated: 23.2 % bytes allocated value is too high: Expected T9020(optasm) bytes allocated: 698401736 +/-10% Lower bound T9020(optasm) bytes allocated: 628561562 Upper bound T9020(optasm) bytes allocated: 768241910 Actual T9020(optasm) bytes allocated: 843289480 Deviation T9020(optasm) bytes allocated: 20.7 % update the test so that GHC doesn't regress again) Expected T7257(normal) bytes allocated: 1654893248 +/-5% Lower bound T7257(normal) bytes allocated: 1572148585 Upper bound T7257(normal) bytes allocated: 1737637911 Actual T7257(normal) bytes allocated: 1414893248 Deviation T7257(normal) bytes allocated: -14.5 % }}} On nofib: {{{ -------------------------------------------------------------------------------- Program Size Allocs Runtime Elapsed TotalMem -------------------------------------------------------------------------------- k-nucleotide +0.5% +106.7% +4.9% +4.9% 0.0% -------------------------------------------------------------------------------- Min +0.4% -0.3% -8.2% -8.3% -1.8% Max +0.7% +106.7% +7.9% +7.8% +2.6% Geometric Mean +0.6% +0.7% +0.0% +0.0% -0.0% Compile Allocations -1 s.d. ----- -0.1% +1 s.d. ----- +1.4% Average ----- +0.7% Compile Times -1 s.d. ----- -10.6% +1 s.d. ----- +8.7% Average ----- -1.4% }}} To investigate: * k-nucleotide * compiler perf on T5631 and T9020 -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11564#comment:9 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler