#ocaml on 2021-02-05 — irc logs at freenode.irclog.whitequark.org

2020-09-11 13:16 companion_cube changed the topic of #ocaml to: Discussions about the OCaml programming language | http://www.ocaml.org | OCaml 4.11 release notes: https://caml.inria.fr/pub/distrib/ocaml-4.11/notes/Changes | Try OCaml in your browser: http://try.ocamlpro.com | Public channel logs at http://irclog.whitequark.org/ocaml

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11:07 <avsm[m]> cemerick: that's worth raising a dune issue for to clarify that it's not an implementation-specific detail

11:08 <avsm[m]> but you're best off explicitly specifying modules in any case

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13:44 <cemerick> avsm[m]: even though it is documented?

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20:04 <oriba> using OCaml with stb-image-Pakackage, reading a jpg file takes about 1.4 s, and the same file opened with Python (PIL-lib) takes about 0.4 s, and this includes converting it from RGB to Lab. In about 1.9 s the Python-script has also calculated a histogram and centroids on the image and written the color-histogram to SQLite-db.

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20:17 <oriba> ok, playing around with OCAMLRUNPARAM I can get below 1s. But thats far away from the Python-PIL thing

20:19 <oriba> Any ideas on how to tweak it for better performance? (used OCAMLRUNPARAM=s=16M,i=32M,o=150 and the image is about 584 kB)

20:21 <oriba> tryied profiling: error: "Profiling with "gprof" (option `-p') is only supported up to OCaml 4.08.0"

20:22 <oriba> how to do that with current ocaml?

20:25 <octachron> Isn't the python library some glue code above optimized C ?

20:25 <octachron> You can use generic profiling tools like prof

20:27 <d_bot> <Bluddy> stb-image is also glue code above a C library. PIL probably has a better implementation

20:28 <d_bot> <Bluddy> if it takes half a second, it sounds like a pretty hefty jpg file. I'm guessing it stretches the limits of stb-image

20:29 <d_bot> <Bluddy> ok you're doing conversion as well

20:29 <oriba> the 0.4 s in PIL is with conversion from RGB to Lab.

20:29 <oriba> yes

20:30 <oriba> Maybe I have a bottleneck when converting the Bigarray-stuff to my int * int * int array.

20:31 <d_bot> <Bluddy> that could be

20:31 <d_bot> <Bluddy> time it without that part

20:31 <d_bot> <Bluddy> still seems like too much time

20:31 <d_bot> <Bluddy> maybe stb-image sucks on jpegs, or is compiled badly somehow

20:32 <d_bot> <Bluddy> but an `int*int*int array` is not an efficient representation for this

20:32 <d_bot> <Bluddy> I suggest you use Owl_base instead to handle the bigarray data

20:32 <oriba> I have not used Bigarra before. Can I perform operations directly on Bigarrays?

20:32 <oriba> Owl, aha.

20:33 <d_bot> <Bluddy> you can with the right library. it's basically numpy

20:33 <oriba> hehe OCaml uses Python-libs?

20:34 <d_bot> <Bluddy> no, it's just a numpy-style library for ocaml

20:34 <d_bot> <Bluddy> https://ocaml.xyz

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21:24 <oriba> ok, when only oing the raw image-read and extracting the bigarray from stb_image, it takes 0.08s!

21:24 <oriba> s/oing/doing/

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23:57 <oriba> when installing owl with opam, I got the message "compilation of conf-openblas failed".

23:57 <oriba> I did not had openblas installed

23:58 <oriba> installation of owl nevertheless continues

23:58 <oriba> when adding openblas later, what do I need to do to tell opam to use it?

23:58 <oriba> installing owl again?

23:58 <oriba> or update/upgrade?

23:59 <oriba> ah, it finished and printed some messages...