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From: Michael Bacarella <michael.bacarella@gmail.com>
To: Christophe Raffalli <christophe@raffalli.eu>
Cc: Florian Angeletti <florian.angeletti@inria.fr>, caml-list@inria.fr
Subject: Re: [Caml-list] Sequential speed 4.12.0 vs 4.13.1 vs multicore (Was: The road to OCaml 5.0)
Date: Fri, 8 Oct 2021 17:58:00 -0700	[thread overview]
Message-ID: <CAK58AGFoHD2k3U5Fp49CDmCi=tmRjWKR1Fz5MR7ujFxWPXj6Hw@mail.gmail.com> (raw)
In-Reply-To: <20211009000722.otsy76prtixl226t@oulala>

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My gut here says you're unwittingly comparing regular ocaml to flambda
ocaml.

https://ocaml.org/manual/flambda.html

Perhaps multicore only comes in flambda flavor now (I notice it's not
available as a switch).

On Fri, Oct 8, 2021 at 5:07 PM Christophe Raffalli <christophe@raffalli.eu>
wrote:

>
> Hello,
>
> I managed to install ocaml 4.12.0 with multicore. I could not parallelise
> my
> code in 5mn ;-) but I check just the sequential speed and got a bit
> surprised. On the same examples, same options (flambda everywhere), etc ...
>
>                       Ex 1      Ex 2          Ex 3
> 4.13.1 normal         45s       12s           49s
> 4.12.0 normal         36s       11s           45s
> 4.12.0 multicore      31s       10s           40s
>
> These are not small differences and it is rather surprising that
>
> 4.13.1 is significantly slower than 4.12.0 (20 to 25%)
>
> 4.12.0 + multicore is faster on sequential code.
>
> Other people observe the same ?
> Any idea ? Should I report an issue for the speed degradation of 4.13.1 ?
>
> Christophe
>

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  reply	other threads:[~2021-10-09  0:58 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-10-07  9:48 [Caml-list] The road to OCaml 5.0 Florian Angeletti
2021-10-08  1:42 ` Francois Berenger
2021-10-08 20:34 ` Christophe Raffalli
2021-10-09  0:07   ` [Caml-list] Sequential speed 4.12.0 vs 4.13.1 vs multicore (Was: The road to OCaml 5.0) Christophe Raffalli
2021-10-09  0:58     ` Michael Bacarella [this message]
2021-10-09  1:11       ` Michael Bacarella
2021-10-09  1:20         ` Michael Bacarella
2021-10-09  2:10       ` Christophe Raffalli
2021-10-09 17:20         ` Xavier Leroy
2021-10-10  3:37           ` Christophe Raffalli
2021-10-09 17:14     ` ygrek

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