AMP performance effect

[Joachim Breitner]

Hi,

nothing overly exciting, but since I am running this ghcspeed thing, I
guess I should inform you about changes, just to get some practice doing
that :-)

Due to various build failures, the AMP landing patch was not measured in
isolation, so these numbers reflect the effect of these patches:

$ git log fdfe6..1e400 --oneline
1e40037 Update nofib submodule to fix errors in main suite.
841924c build.mk.sample: Stage1 needn't be built with -fllvm
68ecc57 base: replace ver 4.7.1.0 references by 4.8.0.0
c6f502b Bump `base` version to 4.8.0.0 for real
27a642c Revert "base: Bump version to 4.8.0.0"
0829f4c base: Bump version to 4.8.0.0
d94de87 Make Applicative a superclass of Monad

If you want to have a look yourself, see
http://ghcspeed-nomeata.rhcloud.com/changes/?rev=1e40037604&exe=2&env=1

Notable points:
 * nofib running times are unchanged on average.
 * binary sizes are consistently reduced by a small amount (-0.7%)
 * one nofib benchmarks show significant increases in allocation:
   - cryptalgorithm2 +17,5%
     Unfortunately, cryptalgorithm’s runtime is below the cut-off, so I 
     cannot tell if that has changed significantly.
   - all other nofib benchmarks have unchanged allocation numbers
 * some testsuite benchmarks as well:
   - T3064     +28%
   - T5631     + 7%
   - T9020     +18%
   - haddock-* +3%
   - many with no change at all, some with noise up to +2,7%

I don’t think this requires action, but if someone feels inclined to
find out what happened to cryptoalgorithm2 (which uses StateT), feel
free to give it a shot!

Greetings,
Joachim


-- 
Joachim “nomeata” Breitner
  mail at joachim-breitner.de • http://www.joachim-breitner.de/
  Jabber: nomeata at joachim-breitner.de  • GPG-Key: 0xF0FBF51F
  Debian Developer: nomeata at debian.org

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