On 27/02/2012 10:46, Joachim Breitner wrote:
Hi,
as I wrote on
http://www.joachim-breitner.de/blog/archives/546-GHC-7.4.1-speeds-up-arbtt-by-a-factor-of-22.html
I observe an enormous speed up (22×) in arbtt, and it seems to be
related to FFI function calls. The release notes do not give a hint what
has changed to result in this speed up, so I’m curious whether someone
here knows the reason, or can make a good guess?
A couple of guesses:
Avoiding slop in pinned objects:
http://hackage.haskell.org/trac/ghc/changeset/cc2ea98ac4a15e40a15e89de9e47f33e191ba393
Stack chunks:
http://hackage.haskell.org/trac/ghc/changeset/f30d527344db528618f64a25250a3be557d9f287
but it's hard to know for sure without investigating more closely.
Cheers,
Simon
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