[Haskell-cafe] Re: seg-fault in mersenne-random with SSE2 (was Performance question)

2009-02-26 Thread Don Stewart 
Alistair.Bayley:
  From: haskell-cafe-boun...@haskell.org 
  [mailto:haskell-cafe-boun...@haskell.org] On Behalf Of Roel van Dijk
  
  I replaced the standard random number generated with the one from
  mersenne-random. On my system this makes the resulting program about
  14 times faster than the original. I also made a change to
  accumulateHit because it doesn't need to count to total. That is
  already known.
 
 
 I tried this too, but got a seg fault (!), so I stripped it back to a
 small test program. This is with mersenne-random, setup configured with
 -fuse_sse2:

This in the past has always meant: wrong architecture (or GCC can't handle sse2 
on your system)

-- Don
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Re: [Haskell-cafe] Re: seg-fault in mersenne-random with SSE2 (was Performance question)

2009-02-26 Thread Peter Verswyvelen 
Might also mean bad alignment of data structures, maybe when marshalling
data between the GHC runtime and the C implementation? If I recall correctly
SSE2 requires 16-byte alignment.
On Thu, Feb 26, 2009 at 5:24 PM, Don Stewart d...@galois.com wrote:

 Alistair.Bayley:
   From: haskell-cafe-boun...@haskell.org
   [mailto:haskell-cafe-boun...@haskell.org] On Behalf Of Roel van Dijk
  
   I replaced the standard random number generated with the one from
   mersenne-random. On my system this makes the resulting program about
   14 times faster than the original. I also made a change to
   accumulateHit because it doesn't need to count to total. That is
   already known.
 
 
  I tried this too, but got a seg fault (!), so I stripped it back to a
  small test program. This is with mersenne-random, setup configured with
  -fuse_sse2:

 This in the past has always meant: wrong architecture (or GCC can't handle
 sse2 on your system)

 -- Don
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 Haskell-Cafe@haskell.org
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