Jan-Willem Maessen wrote:
On Jan 10, 2006, at 4:26 AM, Simon Marlow wrote:
Christian Maeder wrote:
Bulat Ziganshin wrote:
CM> My old version is faster, because the version with
makeStableName does
CM> very much GC.
CM> MUT time 27.28s ( 28.91s elapsed)
CM> GC time 133.98s (140.08s elapsed)
try to add infamous "+RTS -A10m" switch ;)
You saved my day, thank you Bulat!
Without that flag:
MUT time 24.30s ( 24.76s elapsed)
GC time 131.25s (140.01s elapsed)
EXIT time 0.00s ( 0.00s elapsed)
Total time 155.55s (164.77s elapsed)
And with it:
MUT time 23.86s ( 24.86s elapsed)
GC time 11.03s ( 11.68s elapsed)
EXIT time 0.00s ( 0.00s elapsed)
Total time 34.89s ( 36.54s elapsed)
The real problem seems to be that minor GCs are taking too long.
Having said that, you can usually reduce GC overhead with large -A or
-H options.
Is the full table of stable names being traversed at every minor GC?
If so, it might be worth somehow segregating the nursery stable names.
I bet this complicates management a bunch, though, since right now
there's only one table to look things up in.
It's traversed, but not re-hashed. So it shouldn't be a bottleneck,
unless the table is really huge. I agree that separating the gen 0
stable names into a separate table would be the right fix, though.
Cheers,
Simon
_______________________________________________
Glasgow-haskell-users mailing list
[email protected]
http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
