Very cool! It would be nice to add build flags to the table (or at least optimization levels) as these probably differ across packages, and will certainly impact the numbers. I'd also be really interested to see a comparison of the timing data for -O0 and -O. I think the biggest impact for performance improvements will probably come from working on -O0, since that's what people will use for development. Thanks! Eric On Tue, Mar 29, 2016, at 14:00, Ömer Sinan Ağacan wrote:
Hi all,
Using Ben's timing patch [^1], Cabal, and a Haskell program to parse generated logs [^2], I generated some tables that show compile times of modules in hxt, haskell-src-exts, lens, and all of their dependencies:
https://gist.githubusercontent.com/osa1/fd82335181a584679c9f3200b7b0a8a5/raw...
Some notes:
- Modules and passes in modules are sorted.
- At the end of the file you can see the cumulative numbers for the passes. In fact, that's a small table so I'm just going to paste it here:
======================Total====================== CodeGen 41.32% Simplifier 34.83% Renamer/typechecker 12.22% Desugar 2.11% CorePrep 1.90% Demand analysis 1.44% CoreTidy 1.35% Called arity analysis 1.10% Float inwards 0.96% Common sub-expression 0.87% Parser 0.75% SpecConstr 0.57% Specialise 0.30% Worker Wrapper binds 0.17% Liberate case 0.12% ByteCodeGen 0.00% Simplify 0.00%
I don't know how to make use of this yet, but I thought ghc-devs may find it useful.
As a next thing I'm hoping to add some more `withTiming` calls. The analyze program can handle nested `withTiming` calls and renders passes as a tree (GHC HEAD doesn't have nested `withTiming`s so we don't see it in the file above), so we can benchmark things in more details. I also want to experiment a little bit with different `force` parameters to `withTiming`. If anyone has any other ideas I can also try those.
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[^1]: https://phabricator.haskell.org/D1959 [^2]: https://github.com/osa1/analyze-ghc-timings _______________________________________________ ghc-devs mailing list ghc-devs@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs