Bulat Ziganshin wrote:
Hello Chad,
Wednesday, November 5, 2008, 6:34:01 AM, you wrote:
ghc --make -j4 Foo.hs
afair, it was implemented and not shown speed improvements. ask Simon
We did get speed improvements, it was the main case study for the initial
implementation of shared-memory parallelism in GHC. See
http://www.haskell.org/~simonmar/bib/multiproc05_abstract.html
However, due to the way GHC is structured internally (it has some global
caches updated using unsafePerformIO!) the parallel make implementation was
quite fragile, and wasn't suitable for incorporating into GHC proper. It's
certainly possible, but we need to think carefully about how to make these
caches multi-thread-safe.
Cheers,
Simon
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