#ocaml on 2021-02-17 — 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

00:04 <zozozo> ²/b 1

00:04 <zozozo> oops, sorry

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20:14 <d_bot> <Christophe> Hello 👋 Maybe silly question, but I hear a lot that OCaml's GC is very performant, but I was wondering if there has been comparison, benchmarks, with GCs of other languages, if it even makes sense

20:16 <d_bot> <Christophe> Context is someone explaining how garbage collection can be hurting performance, while talking about Java, but then before advocating for OCaml's GC, I wondered if it would do much better under the same conditions

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21:09 <lobo> what would be an appropriate way to handle cases where Lwt_io.read_line_opt/read_line don't trigger an end of file? my code currently "hangs" and doesn't hit the None case with read_line_opt. data is read from a unix socket https://pastebin.com/pzDuye0X

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21:17 <sadiq> Christophe: not a silly question. It's doesn't really make sense to compare OCaml's GC directly to Java's many GCs.

21:17 <sadiq> *though

21:18 <sadiq> 1) it's tuned for the kind of allocation behaviour that OCaml programs exhibit which is probably quite different from Java.

21:19 <sadiq> (e.g you want as minimal overhead as possible on small allocations in OCaml because things like Lists allocate many very small blocks)

21:20 <sadiq> 2) trunk OCaml's GC is single threaded, that can simplify things.

21:21 <sadiq> Java has a range of very sophisticated GCs, some better than others.

21:21 <sadiq> with the right choice and a bit of tuning you can get some excellent performance out of them (as in a throughput overhead of maybe 5-10% max)

21:22 <sadiq> (though that does depend on your allocation behaviour)

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21:25 <sadiq> the closest of Java's GCs to the OCaml trunk GC is the parallel collector

21:25 <sadiq> Multicore's collector is pretty close to CMS.

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