Re: [Haskell-cafe] Re: Haskell performance

simonmarhaskell:

Malcolm Wallace wrote:

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Simon Peyton-Jones wrote:

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What would be v helpful would be a regression suite aimed at performance, that benchmarked GHC (and perhaps other Haskell compilers) against a set of programs, regularly, and published the results on a web page, highlighting regressions.

Something along these lines already exists - the nobench suite. darcs get http://www.cse.unsw.edu.au/~dons/code/nobench It originally compared ghc, ghci, hugs, nhc98, hbc, and jhc. (Currently the results at http://www.cse.unsw.edu.au/~dons/nobench.html compare only variations of ghc fusion rules.)

I have just been setting up my own local copy - initial results at http://www.cs.york.ac.uk/fp/nobench/powerpc/results.html where I intend to compare ghc from each of the 6.4, 6.6 and 6.8 branches, against nhc98 and any other compilers I can get working. I have powerpc, intel, and possibly sparc machines available.

That's great. BTW, GHC has a performance bug affecting calendar at the moment:

http://hackage.haskell.org/trac/ghc/ticket/1168

The best GHC options for this program might therefore be -O2 -fno-state-hack. Or perhaps just -O0.

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Like Hackage, it should be easy to add a new program.

Is submitting a patch against the darcs repo sufficiently easy? Should we move the master darcs repo to somewhere more accessible, like code.haskell.org?

Yes, please do. When I have a chance I'd like to help out.

Malcolm, can you just take the darcs repo, and move it to code.haskell.org? -- Don