I did again some testing, with a Caml program with 2 thread, one doing 
only float computation for a long time with no allocation. The nanosleep 
suggestion seems much better than the actual version doing nothing:

This gives the following code in systhreads/posix.c:

/* Allow re-scheduling */

value caml_thread_yield(value unit)        /* ML */
{
  struct timespec timer = { 0, 1 };

   enter_blocking_section();
   nanosleep (&timer, NULL);
   /* sched_yield();*/
   leave_blocking_section();
   return Val_unit;
}


-- 
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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