#ocaml on 2019-11-01 — irc logs at freenode.irclog.whitequark.org

2019-09-26 12:04 adrien changed the topic of #ocaml to: Discussions about the OCaml programming language | http://www.ocaml.org | OCaml 4.09 release notes: https://caml.inria.fr/pub/distrib/ocaml-4.09/notes/Changes | Try OCaml in your browser: http://try.ocamlpro.com | Public channel logs at http://irclog.whitequark.org/ocaml

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11:23 <cranix> is it possible to parallelise computations in ocaml to use more that avaiable CPU cores?

11:24 <cranix> at one hand immutability and similart things should make it easier but i read somewhere about global lock...

11:24 <cranix> i'm going to have quite a few things to compute that can be processed independently

11:24 <cranix> and my target machine have many CPU cores

11:25 <dinosaure> thread module can do that

11:26 <dinosaure> at least, or lwt with `Lwt_preemptive.detach`

11:27 <Armael> on the top of my head you can also look into functory

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11:31 <cranix> thanks

11:32 <cranix> can i with this libraries manage how many CPU cores i will use?

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12:35 <def`> cranix: to use multiple cores you will need multiple processes

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13:11 <cranix> def`: processes as in multiple instances of my program?

13:11 <cranix> or in which sense processes?

13:14 <def`> cranix: yes

13:14 <cranix> good to know

13:15 <cranix> and then OS will assign it to another CPU core or not?

13:15 <def`> the "global lock" you mentioned is on the GC/memory allocator.

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13:15 <cranix> thanks for explaination

13:15 <def`> yes, the OS will transparently balance the processes among the computing resources

13:15 <cranix> i would like to read more about internals of ocaml like when something new is allocated in memory

13:16 <def`> it is very difficult to make an efficient allocator

13:16 <cranix> due to bad experience with common lisp and it's non obvious implicit allocation of thins in heap

13:16 <cranix> i can imagine

13:16 <def`> that works well on multiple core. So there is a project doing that currently, but it is not stable yte.

13:16 <def`> yet*

13:17 <def`> Real World OCaml has a few words about that.

13:17 <cranix> thanks for information

13:17 <def`> (about allocation, not about the multicore GC project :))

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