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[Caml-list] Where does Ocaml spend all the time?
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Date: -- (:)
From: Remi VANICAT <vanicat@l...>
Subject: Re: [Caml-list] Where does Ocaml spend all the time?
Florian Hars <florian@hars.de> writes:

> I have written an ocaml program, which is about an order of magnitude
> slower than a similar C program, and now I am wondering what to do.
> According to gprof, I have neiter written nor called most of the
> top-scoring functions in my program:
> 
>   %   cumulative   self              self     total           
>  time   seconds   seconds    calls  ms/call  ms/call  name    
>   9.82      2.76     2.76  9822122     0.00     0.00  Verzeichnis_code_end
>   9.00      5.29     2.53     3275     0.77     0.77  mark_slice
>   8.15      7.58     2.29    17860     0.13     0.54  Stra$dfen_e_i_l_rec_129
>   8.04      9.84     2.26 23232718     0.00     0.00  string_equal
>   7.44     11.93     2.09     4088     0.51     0.62  sweep_slice
>   5.73     13.54     1.61   390646     0.00     0.01  oldify
>   4.16     14.71     1.17 22241546     0.00     0.00  Eintrag_code_begin
>   3.88     15.80     1.09                             Stringhilfsfunktionen_code_begin
> 
> Only the third and fourth entry seem to do anything "useful", the rest
> looks like administrative overhead to me. What are these functions
> doing?

only the third and fourth ? 

the Verzeichnis_code_end seem to be part of your program (Verzeichnis?
it is not English) The same for Eintrag_code_begin and
Stringhilfsfunktionen_code_begin. It left mark_slice, sweep_slice and
oldify, that are all part of the GC. As i don't know your code, it's
difficult to bettered it, but you should concentrate over the Eintrag
and Stringhilfsfunktionen functions.

by the way, have you read the ocaml FAQ on efficiency?
http://caml.inria.fr/FAQ/FAQ_EXPERT-eng.html#efficacite

-- 
Rémi Vanicat
vanicat@labri.u-bordeaux.fr
http://dept-info.labri.u-bordeaux.fr/~vanicat
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