Re: [Caml-list] an OCaml program profile

[Kakadu <kakadu.hafanana@gmail.com>]

I have had the same issue with my parser combinators this summer.
OCamlLex based lexer was allocating a lot during lexing phase nad
that's why my heap was consist of many small free block which couldn't
be used for new allocations. Increasing minor heap size fas a partial
solution. Running Gc.compact () manually was a main solution.

Happy hacking,
Kakadu

On Fri, Sep 6, 2013 at 5:48 AM, Francois Berenger <berenger@riken.jp> wrote:
> Hello,
>
> I am running experiments with a program.
> I'd like the program to run faster because
> it would reduce experiments round-trip.
>
> Here is the top of the profile:
> ---
> Flat profile:
>
> Each sample counts as 0.01 seconds.
>   %   cumulative   self              self     total
>  time   seconds   seconds    calls   s/call   s/call  name
>  58.07    132.13   132.13 161527987     0.00     0.00  caml_fl_allocate
>  21.13    180.21    48.08     2339     0.02     0.02  caml_fl_add_blocks
>   4.87    191.30    11.09     5497     0.00     0.00  mark_slice
>   1.65    195.06     3.76 979591485     0.00     0.00 caml_page_table_lookup
>   1.50    198.47     3.41     5620     0.00     0.00  sweep_slice
>   1.20    201.21     2.74 186584504     0.00     0.00  caml_oldify_one
>   1.04    203.57     2.36 134849325     0.00     0.00  compare_val
>   1.02    205.89     2.32 290049921     0.00     0.00  caml_float_compare
>   0.80    207.71     1.82 123048730     0.00     0.00  caml_hash
>   0.76    209.44     1.73 161525648     0.00     0.00  caml_alloc_shr
> ---
>
> I think the program spends most of its time doing garbage
> collection.
>
> How can I make it go faster?
>
> Would the OPAM switch 4.00.1+alloc-profiling (support allocation profiling
> on x86_64) would allow me to find the culprit function?
>
> If yes, how to use it?
>
> Thanks a lot,
> Francois.
>
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