[Haskell-cafe] The Garbage Collector Ate My Homework

[Tim Chevalier]

On 7/3/07, Thomas Conway <drtomc at gmail.com> wrote:
> Okay, so a bit of a tweak of the RTS flags, I got a DRAMATIC improvement:
>
> 239,434,077,460 bytes allocated in the heap
> 9,034,063,712 bytes copied during GC (scavenged)
> 132,748,740 bytes copied during GC (not scavenged)
> 226,313,736 bytes maximum residency (7 sample(s))
>
>        5992 collections in generation 0 (136.16s)
>          38 collections in generation 1 ( 62.69s)
>           7 collections in generation 2 (  1.38s)
>
>         792 Mb total memory in use
>
>   INIT  time    0.00s  (  0.00s elapsed)
>   MUT   time  417.54s  (673.69s elapsed)
>   GC    time  200.23s  (205.86s elapsed)
>   EXIT  time    0.00s  (  0.00s elapsed)
>   Total time  617.78s  (879.55s elapsed)
>
>   %GC time      32.4%  (23.4% elapsed)
>
>   Alloc rate    573,432,968 bytes per MUT second
>
>   Productivity  67.6% of total user, 47.5% of total elapsed
>
> The flags I used were: -H500M -G3
>

Nice -- but did you compare the results if you just add -H500M and not -G3?

Cheers,
Tim

-- 
Tim Chevalier* catamorphism.org *Often in error, never in doubt
"Aw, honey, you can keep what's in my pockets, but send me back my
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