Re: [Caml-list] Status of Flambda in OCaml 4.03

[Mohamed Iguernlala <iguer.auto@gmail.com>]

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Good results, but it would be better to compare with 4.03.0+trunk.

Have you used particular options for flambda (eg. -O3 -unbox-closures) ?
have you modified the default value of -inline option ?

I noticed better performances with "-O3 -unbox-closures" on Alt-Ergo, but
I have probably to ajust the value of "-inline" (which is currently set 
to 100).

- Mohamed.|

|
Le 17/04/2016 10:43, Jesper Louis Andersen a écrit :
> Tried `opam switch ocaml-4.03.0+trunk+flambda` on the Transit format 
> encoder/decoder i have. I wanted to see how much faster flambda would 
> make the code, since I've heard 20% and 30% thrown around. It is not 
> very optimized code, and in particular, the encoder path is rather 
> elegant, but awfully slow. Well, not anymore:
>
> 4.02:
>  Name     Time/Run      mWd/Run   mjWd/Run   Prom/Run   Percentage
> ------------ ---------- ------------ ---------- ---------- ------------
>  decode       2.12ms     352.86kw    34.86kw    34.86kw       27.88%
>  encode       5.07ms     647.93kw   263.69kw   250.40kw       66.70%
>  round_trip     7.61ms   1_000.79kw   298.54kw   285.26kw    100.00%
> 4.03.0+trunk+flambda:
>
> │ Name   │ Time/Run │  mWd/Run │ mjWd/Run │ Prom/Run │ Percentage │
>
> │ decode   │   2.04ms │ 319.83kw │  35.94kw │  35.94kw │     43.97% │
> │ encode   │   2.65ms │ 422.67kw │ 130.88kw │ 117.59kw │     56.95% │
> │ round_trip │   4.65ms │ 742.50kw │ 164.85kw │ 151.56kw │  100.00% │
>
> Pretty impressive result. Note the heavyweight lifting is due to the 
> yajl JSON parser and this poses a lower bound. But I think the speedup 
> in the encode-path is rather good.
>
> Note that the benchmark is probably flawed and some time passed 
> between these two runs, so there might be a confounder hidden in other 
> fixes, either to yajl, or to other parts of the compiler toolchain. 
> However, I think the result itself stands since in practice, my 
> encoding time was just cut in half.
>


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