[Caml-list] GC and caml_oldify_local_roots taking too much time

[Christophe Raffalli <christophe.raffalli@univ-savoie.fr>]

I have a program (doing some shape optimisation) that runs slowler and 
slower. I did some profiling using grpof (and -pg option) and get the 
following result:

- the memory usage does not grow (stays bounded and reach very fast its 
maximum)
- The number of GC cycles and compactions per time unit stays constant 
(actually there is quite a lot of compaction (very approximatively 1 per 
minute).
- The function caml_oldify_local_roots is bellow 2% on a 5 minutes run 
but arround 50% on a 30 minutes run and prbably much more on a ten hour 
runs, but did not have the time to let the program run 10 hours with -pg 
(it will take 10 hours :-).
- All other GC functions are quite low in the profile.

What could cause the increase of time spent in caml_oldify_local_roots ?
And what is this function in the first place ?

Thanks in advance for any hint.

-- 
Christophe Raffalli
Université de Savoie
Batiment Le Chablais, bureau 21
73376 Le Bourget-du-Lac Cedex

tél: (33) 4 79 75 81 03
fax: (33) 4 79 75 87 42
mail: Christophe.Raffalli@univ-savoie.fr
www: http://www.lama.univ-savoie.fr/~RAFFALLI
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