I haven't been watching this, but I have one question: does prefetching
actually *work*? Do you have benchmarks (or better still, actual
library/application code) that show some improvement? I admit to being
slightly sceptical - when I've tried using prefetching in the GC it has
always been a struggle to get something that shows an improvement, and
even when I get things tuned on one machine it typically makes things
slower on a different processor. And that's in the GC, doing it at the
Haskell level should be even harder.
Cheers,
Simon
On 22/11/2014 05:43, Carter Schonwald wrote:
Hey Everyone,
in
https://ghc.haskell.org/trac/ghc/ticket/9353
and
https://phabricator.haskell.org/D350
is some preliminary work to fix up how the pure versions of the prefetch
primops work is laid out and prototyped.
However, while it nominally fixes up some of the problems with how the
current pure prefetch apis are fundamentally borken, the simple design
in D350 isn't quite ideal, and i sketch out some other ideas in the
associated ticket #9353
I'd like to make sure pure prefetch in 7.10 is slightly less broken
than in 7.8, but either way, its pretty clear that working out the right
fixed up design wont happen till 7.12. Ie, whatever makes 7.10, there
WILL have to be breaking changes to fix those primops for 7.12
thanks and any feedback / thoughts appreciated
-Carter
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