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

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

Damien Doligez wrote:
> On Jul 19, 2004, at 19:59, Christophe Raffalli wrote:
> 
>> What could cause the increase of time spent in caml_oldify_local_roots ?
>> And what is this function in the first place ?
> 
> 
> It is the function that finds the roots of the memory graph:
> 
> 1. in the stack
> 2. in the global C roots
> 3. among finalised values
> 4. in the stacks of other threads, if any
> 
> I guess your program does one or more of the following:
> 
> 1. allocate lots of stack space (deep recursion)

That's not the case, I am in a while loop so recursion depth is bounded

> 2. declare lots of C roots (with caml_register_global_root)

That may be a bug in the lablGL code ... I had a short look but found 
nothing.

> 3. launch lots of threads that allocate big stacks

I launch only two threads (native posix threads)


> I don't think finalised values can be the problem, because this
> particular set of roots is emptied after each minor collection.

I removed call to finalise and saw no change. Anyway I have always less 
than 10 not collected object with finaliser.

> It should be possible to do something better for case (2), but
> if you declare arbitrary amounts of C roots, you will still pay
> the price at each major collection (instead of each minor
> collection as it is now).

I will look better at lablGL/Glut code now.

Thanks


> -- Damien
> 
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-- 
Christophe Raffalli
Université de Savoie
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