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[GHC] #2462: Data.List.sum is slower than 6.8.3

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	[GHC] #2462: Data.List.sum is slower than 6.8.3 by GHC-2 :: Rate this Message: Reply to Author \| View Threaded \| Show Only this Message #2462: Data.List.sum is slower than 6.8.3 -----------------------------------------+---------------------------------- Reporter: simonmar \| Owner: Type: run-time performance bug \| Status: new Priority: high \| Milestone: 6.10.1 Component: Compiler \| Version: 6.8.3 Severity: normal \| Keywords: Difficulty: Unknown \| Testcase: Architecture: Unknown \| Os: Unknown -----------------------------------------+---------------------------------- {{{ main = print (sum [1..100000000::Int]) }}} with 6.8.3: {{{ MUT time 1.76s ( 1.79s elapsed) }}} with HEAD (22/7/08) {{{ MUT time 1.97s ( 1.99s elapsed) }}} complete guess: sum has been mis-optimised by SAT? -- Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2462> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler _______________________________________________ Glasgow-haskell-bugs mailing list Glasgow-haskell-bugs@... http://www.haskell.org/mailman/listinfo/glasgow-haskell-bugs
	Re: [GHC] #2462: Data.List.sum is slower than 6.8.3 by GHC-2 :: Rate this Message: Reply to Author \| View Threaded \| Show Only this Message #2462: Data.List.sum is slower than 6.8.3 --------------------------------------+------------------------------------- Reporter: simonmar \| Owner: simonpj Type: run-time performance bug \| Status: new Priority: high \| Milestone: 6.10.1 Component: Compiler \| Version: 6.8.3 Severity: normal \| Resolution: Keywords: \| Difficulty: Unknown Testcase: \| Architecture: Unknown Os: Unknown \| --------------------------------------+------------------------------------- Changes (by simonpj): * owner: => simonpj -- Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2462#comment:1> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler _______________________________________________ Glasgow-haskell-bugs mailing list Glasgow-haskell-bugs@... http://www.haskell.org/mailman/listinfo/glasgow-haskell-bugs
	Re: [GHC] #2462: Data.List.sum is slower than 6.8.3 by GHC-2 :: Rate this Message: Reply to Author \| View Threaded \| Show Only this Message #2462: Data.List.sum is slower than 6.8.3 --------------------------------------+------------------------------------- Reporter: simonmar \| Owner: simonpj Type: run-time performance bug \| Status: closed Priority: high \| Milestone: 6.10.1 Component: Compiler \| Version: 6.8.3 Severity: normal \| Resolution: invalid Keywords: \| Difficulty: Unknown Testcase: \| Architecture: Unknown Os: Unknown \| --------------------------------------+------------------------------------- Changes (by simonpj): * status: new => closed * resolution: => invalid Comment: I can't reproduce this. I compiled {{{ module Main( main ) where main = print (sum [1..100000000::Int]) }}} with -O and -O2 with the HEAD and 6.8.3. Results are essentially identical. I'll close this, but if anyone else can reproduce it, please re-open. {{{ Allocs Runtime(user) ghc-HEAD -O 8.031M 1.82s ghc-HEAD -O2 8.031M 1.82s ghc-6.8.3 -O 8.031M 1.82s ghc-6.8.3 -O2 8.031M 1.82 }}} Simon -- Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2462#comment:2> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler _______________________________________________ Glasgow-haskell-bugs mailing list Glasgow-haskell-bugs@... http://www.haskell.org/mailman/listinfo/glasgow-haskell-bugs
	Re: [GHC] #2462: Data.List.sum is slower than 6.8.3 by GHC-2 :: Rate this Message: Reply to Author \| View Threaded \| Show Only this Message #2462: Data.List.sum is slower than 6.8.3 --------------------------------------+------------------------------------- Reporter: simonmar \| Owner: simonpj Type: run-time performance bug \| Status: reopened Priority: high \| Milestone: 6.10.1 Component: Compiler \| Version: 6.8.3 Severity: normal \| Resolution: Keywords: \| Difficulty: Unknown Testcase: \| Architecture: Unknown Os: Unknown \| --------------------------------------+------------------------------------- Changes (by simonmar): * status: closed => reopened * resolution: invalid => Comment: We think it's necessary to compile the definition of sum itself with -O2 in order to reproduce this. -- Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2462#comment:3> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler _______________________________________________ Glasgow-haskell-bugs mailing list Glasgow-haskell-bugs@... http://www.haskell.org/mailman/listinfo/glasgow-haskell-bugs
	Re: [GHC] #2462: Data.List.sum is slower than 6.8.3 by GHC-2 :: Rate this Message: Reply to Author \| View Threaded \| Show Only this Message #2462: Data.List.sum is slower than 6.8.3 --------------------------------------+------------------------------------- Reporter: simonmar \| Owner: simonpj Type: run-time performance bug \| Status: closed Priority: high \| Milestone: 6.10.1 Component: Compiler \| Version: 6.8.3 Severity: normal \| Resolution: invalid Keywords: \| Difficulty: Unknown Testcase: \| Architecture: Unknown Os: Unknown \| --------------------------------------+------------------------------------- Changes (by simonpj): * status: reopened => closed * resolution: => invalid Comment: I did that and it's still fine. Re-open if you think otherwise! Simon -- Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2462#comment:4> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler _______________________________________________ Glasgow-haskell-bugs mailing list Glasgow-haskell-bugs@... http://www.haskell.org/mailman/listinfo/glasgow-haskell-bugs
	Re: [GHC] #2462: Data.List.sum is slower than 6.8.3 by GHC-2 :: Rate this Message: Reply to Author \| View Threaded \| Show Only this Message #2462: Data.List.sum is slower than 6.8.3 --------------------------------------+------------------------------------- Reporter: simonmar \| Owner: simonpj Type: run-time performance bug \| Status: closed Priority: high \| Milestone: 6.10.1 Component: Compiler \| Version: 6.8.3 Severity: normal \| Resolution: invalid Keywords: \| Difficulty: Unknown Testcase: \| Architecture: Unknown Os: Unknown \| --------------------------------------+------------------------------------- Comment (by simonmar): unreproducible for me too now. -- Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2462#comment:5> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler _______________________________________________ Glasgow-haskell-bugs mailing list Glasgow-haskell-bugs@... http://www.haskell.org/mailman/listinfo/glasgow-haskell-bugs

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