[Haskell-cafe] FPS lib

[Donald Bruce Stewart]

kr.angelov:
> 2005/10/19, Simon Marlow <simonmar at microsoft.com>:
> > On 19 October 2005 01:08, Donald Bruce Stewart wrote:
> > > Ah!! So what's going on on Linux, I wonder. Could it be something
> > > about
> > > 6.4.1? Are we seeing the difference between ForeignPtrs from 6.4 to
> > > 6.5? I will investigate.
> >
> > I bet that's the difference between ForeignPtrs in 6.4.1 and 6.5.  I'm
> > very tempted to merge the ForeignPtr optimisations into 6.4.2, so we can
> > benefit from this earlier.  The changes are all confined to one module
> > (GHC/ForeignPtr.hs).
> 
> I made my benchmarking with ghc-6.5 and I am getting relatively the
> same result as with ghc-6.4.1. I checked that the optimized ForeignPtr
> implementation is in my source tree. Any thoughts?

Ok, rerunning the test you posted with only the compiler version
varying (so, just the FPS ForeignPtr code on OpenBSD x86, Pentium M 1.6G).

With ghc 6.4.1
        test1:      121.10s
        test2:      252.11s

And with ghc 6.5
        test1:        2.006s
        test2:        6.112s
 
Wow, ForeignPtr was slow with 6.4.1!

-- Don