Re: [Caml-list] Behaviour of an OCaml program: any possible GC improvement?

[David MENTRE <dmentre@linux-france.org>]

Hello,

2012/10/25 David MENTRE <dmentre@linux-france.org>:
> 2012/10/24 Török Edwin <edwin+ml-ocaml@etorok.net>:
>> You can try tuning the Gc parameters:
>> http://caml.inria.fr/pub/docs/old-311/libref/Gc.html
>>
>> Try increasing minor_heap_size, and major_heap_increment and see if there is any improvement.
>> Also look at Gc.stat() and see how many major collections and live words you have.
>
> Olivier Andrieu made a similar suggestion and that helps!
>
> 2012/10/25 Olivier Andrieu:
>> Try running your program with OCAMLRUNPARAM=s=256k !
>> (A good value is about the size of the CPU L2 cache I'd say).
>
> Thanks Olivier, your suggestion brings significant improvements!
>
> On a particular example:
>   * default: 2m14.142s
>   * s=256k: 1m32.185s
>   * s=1024k: 0m45.420s

For the record, it appears I was generating a Map of more than 100,000
entries (and using several variants of it). With some algorithm
tweaking I improved drastically both the size of this map and the
computation time of my program.

Many thanks to those that have helped me on this issue!

Best regards,
david