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2020-10-23 16:26:04 × geowiesnot quits (~user@87-89-181-157.abo.bbox.fr) (Ping timeout: 256 seconds)
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2020-10-23 16:30:36 moy is now known as Guest45505
2020-10-23 16:31:07 <Guest45505> im wondering, how many thread can i open in concurrency within a haskell programm ? do one thread === one CPU core ?
2020-10-23 16:31:41 <Rembane> Guest45505: What kind of threads?
2020-10-23 16:32:00 <Guest45505> those that you open by calling forkIO for example
2020-10-23 16:32:01 × christo quits (~chris@81.96.113.213) (Remote host closed the connection)
2020-10-23 16:32:47 <texasmynsted> I know this is a terrible question but . . . There are many options for writing "shell scripts" using Haskell. Too many for me to select one.
2020-10-23 16:33:21 <c_wraith> Guest45505: So... this is actually sort of complex, because GHC has a couple options that completely change how threads work. But in no case is a GHC thread an OS thread
2020-10-23 16:33:28 <texasmynsted> If my goal was to improve my Haskell skill, especially for streaming and concurrency, what would you recommend?
2020-10-23 16:34:04 <Rembane> texasmynsted: Go for the turtle one!
2020-10-23 16:34:16 <monsterchrom> "Green threads", i.e, many Haskell threads cramped to N cores, you choose N.
2020-10-23 16:34:27 <Rembane> texasmynsted: https://hackage.haskell.org/package/turtle
2020-10-23 16:34:34 <monsterchrom> Even if you have 64 cores you can tell the RTS to use just 2 cores.
2020-10-23 16:34:54 <monsterchrom> In fact "green threads" is more nuanced than that.
2020-10-23 16:34:57 <c_wraith> Guest45505: GHC has two different options for runtimes that can be linked in to programs it compiles. One uses a single thread for all Haskell code, which lets it skip all kinds of locking and synchronization primitives.
2020-10-23 16:34:58 <texasmynsted> why turtle. That is . . . not what I expected.
2020-10-23 16:35:32 <c_wraith> Guest45505: the other is what monsterchrom is describing, where it can split the Haskell threads across multiple OS threads.
2020-10-23 16:35:33 <monsterchrom> But if you know Java's "green threads", that's what we have too.
2020-10-23 16:36:34 <texasmynsted> lol. First thing it says is install Stack. (If I use turtle it will not be with Stack.)
2020-10-23 16:37:00 <Rembane> I propose that you can for all practical intents and purposes have an infinite amount of "green threads" and things will work just fine.
2020-10-23 16:37:14 <Rembane> texasmynsted: What was what you expected?
2020-10-23 16:37:17 <Guest45505> monsterchrom ok i see, thats much clearer for me now, thanks
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2020-10-23 16:38:44 × thir quits (~thir@p200300f27f19de00a929a56a6a990c9a.dip0.t-ipconnect.de) (Remote host closed the connection)
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2020-10-23 16:39:11 <texasmynsted> Shell-conduit or something?
2020-10-23 16:40:09 × Guest18 quits (567e8866@gateway/web/cgi-irc/kiwiirc.com/ip.86.126.136.102) (Quit: Connection closed)
2020-10-23 16:41:55 <Rembane> Cool, I have never used it. :)
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2020-10-23 16:46:32 <ulidtko> texasmynsted, best option for shell scripts is... bash.
2020-10-23 16:46:49 × conal quits (~conal@64.71.133.70) (Quit: Computer has gone to sleep.)
2020-10-23 16:46:59 <ulidtko> however -- check out https://www.shellcheck.net it's written in haskell if that gives you the warm fuzzy feeling
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2020-10-23 16:49:39 <texasmynsted> ulidtko: I agree with you. I just mean for things that "outgrow" a shell script.
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2020-10-23 16:51:15 <ulidtko> yes, that happens all the time. either rewrite it, or deal with it (shellcheck is really helpful, also following consistent style)
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2020-10-23 16:53:16 <texasmynsted> Yes, I love shellscript.
2020-10-23 16:53:17 → xerox_ joins (~xerox@unaffiliated/xerox)
2020-10-23 16:53:24 <texasmynsted> I mean shellcheck
2020-10-23 16:53:33 <texasmynsted> I have it integrated into vim
2020-10-23 16:53:59 <ulidtko> as for rewriting options: I sort of fail to see the point to "emulate" bash and try to make it look like shellscript...
2020-10-23 16:54:06 <ulidtko> same
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2020-10-23 16:54:34 <ulidtko> https://hackage.haskell.org/package/HSH-2.1.3 using this one, you can spawn processes and pipes "just like" in bash
2020-10-23 16:55:09 <ulidtko> but all the ['extra', 'syntax'] makes you really want to go back to bash instead
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2020-10-23 16:55:54 × christo quits (~chris@81.96.113.213) (Remote host closed the connection)
2020-10-23 16:56:01 <ulidtko> so, a good linter like shellcheck really hits the sweat spot IMO
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2020-10-23 16:56:26 <ulidtko> (*sweet haha)
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2020-10-23 16:57:12 <texasmynsted> I am not trying to emulate bash. Rather I am trying to find the best way to interact with shell processes that do not have a haskell module.
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