On Tue, 30 Mar 2004, Simon Marlow wrote: > The upshot of what he found is that we could benefit from some > prefetching, perhaps on the order of 10-20%. Particularly prefetching > in the allocation area during evaluation, to ensure that memory about to > be written to is in the cache, and similar techniques during GC could > help. However, actually taking advantage of this is quite hard - > prefetching instructions aren't standard, and even when they are getting > any benefit can depend on cache architecture and other effects which > vary between processor families. Getting things wrong often results in > a slowdown. It's just too brittle.
Exactly: prefetching sucks, particularly for a compiler supporting multiple architectures, using native and via-C compilation. Simon, did you ever try separating the code and data for each closure? N _______________________________________________ Haskell mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/haskell
