[Haskell-cafe] OCaml list sees abysmal Language Shootout results

[Greg Buchholz]

Andrew Cheadle wrote:
> 
> +RTS -Sstderr -RTS and +RTS -sstderr -RTS will probably indicate why.
> I'd be surprised if the amount of data copied for the semi-space
> collector isn't much less than for the generational.

    Ahh. Data copied with '-G1' = 58MB vs. 203MB without.  For posterities 
sake, here are the numbers...

With '-G1'
---------------------------------------------------
306,616,872 bytes allocated in the heap
 58,844,344 bytes copied during GC
     99,316 bytes maximum residency (1169 sample(s))

       1169 collections in generation 0 (  0.62s)

          1 Mb total memory in use

  INIT  time    0.00s  (  0.00s elapsed)
  MUT   time    0.68s  (  0.71s elapsed)
  GC    time    0.62s  (  0.68s elapsed)
  EXIT  time    0.00s  (  0.00s elapsed)
  Total time    1.30s  (  1.39s elapsed)

  %GC time      47.7%  (48.9% elapsed)

  Alloc rate    450,907,164 bytes per MUT second

  Productivity  52.3% of total user, 48.9% of total elapsed


Without
---------------------------------------------------
306,616,872 bytes allocated in the heap
203,339,812 bytes copied during GC
    109,088 bytes maximum residency (131 sample(s))

       1169 collections in generation 0 (  2.22s)
        131 collections in generation 1 (  0.05s)

          2 Mb total memory in use

  INIT  time    0.00s  (  0.00s elapsed)
  MUT   time    0.79s  (  0.92s elapsed)
  GC    time    2.27s  (  2.23s elapsed)
  EXIT  time    0.00s  (  0.00s elapsed)
  Total time    3.06s  (  3.15s elapsed)

  %GC time      74.2%  (70.8% elapsed)

  Alloc rate    388,122,622 bytes per MUT second

  Productivity  25.8% of total user, 25.1% of total elapsed


Greg Buchholz