[Haskell-cafe] The Garbage Collector Ate My Homework

[Tim Chevalier]

On 7/3/07, Thomas Conway <drtomc at gmail.com> wrote:
> Well, not quite, but look at the following:
>
> 118,342,689,824 bytes allocated in the heap
> 144,831,738,780 bytes copied during GC (scavenged)
> 335,086,064 bytes copied during GC (not scavenged)
> 255,257,516 bytes maximum residency (42 sample(s))
>
>      222884 collections in generation 0 (3891.90s)
>          42 collections in generation 1 (153.99s)
>
>         536 Mb total memory in use
>
>   INIT  time    0.00s  (  0.00s elapsed)
>   MUT   time  233.66s  (776.99s elapsed)
>   GC    time  4045.89s  (4251.52s elapsed)
>   EXIT  time    0.00s  (  0.00s elapsed)
>   Total time  4279.55s  (5028.52s elapsed)
>
>   %GC time      94.5%  (84.5% elapsed)
>
>   Alloc rate    506,470,897 bytes per MUT second
>
>   Productivity   5.5% of total user, 4.6% of total elapsed
>
> Can anyone offer general suggestions for how to fix this!
>

Are you compiling with -O2? Besides that, there's not too much we can
say without either seeing your code, or the results of profiling when
you compile with -prof -auto-all, or both.

Cheers,
Tim

-- 
Tim Chevalier* catamorphism.org *Often in error, never in doubt
"There are no difficult problems, just unfortunate notations."  --
Alfonso Gracia-Saz