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yoshuawuyts's profile
yosh
yosh
yosh
@yoshuawuyts

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yosh

@yoshuawuyts

Software researcher. he/they

Berlin, UTC+2
blog.yoshuawuyts.com
Joined May 2009

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    yosh‏ @yoshuawuyts 15 Jul 2019
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    Does anyone have a good introduction to (atomic) memory access models? I keep hearing terms such as "relaxed and "acquire", but I have no idea what they mean.

    9:10 AM - 15 Jul 2019
    • 3 Retweets
    • 20 Likes
    • Mitja Karhusaari Aseem Baranwal Jayson Reis nia 👁 Jeff Aaron Turon Ashley Mannix James<'a, N> where N: ArrayLength<u8>,
    7 replies 3 retweets 20 likes
      1. New conversation
      2. Firstyear‏ @Erstejahre 15 Jul 2019
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        Replying to @yoshuawuyts

        Ulrich Drepper's "what every programmer should know about memory" can help. Generally the orderings are hard as they are about compiler and cpu code reordering, not just "barriers". Happy to talk and code review if you want! (I specialise in concurrent databases)

        2 replies 0 retweets 4 likes
      3. Firstyear‏ @Erstejahre 15 Jul 2019
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        Replying to @Erstejahre @yoshuawuyts

        Tldr - relaxed is "code before and after can be redordered anywhere around the atomic", and acquire means "all code after the atomic stays after the atomic, but proceeding can move to after as well."

        1 reply 0 retweets 2 likes
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      2. Marcus Blättermann  🍃‏ @essenmitsosse 15 Jul 2019
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        Replying to @yoshuawuyts

        Can you give a quick recap in which areas those terms are relevant for someone who can’t even place “atomic memory access“

        1 reply 0 retweets 1 like
      3. yosh‏ @yoshuawuyts 15 Jul 2019
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        Replying to @essenmitsosse

        Multi-threaded memory access. Atomics are the building blocks (assembly instructions) which you can use to implement something like a mutex. Memory ordering rules govern which guarantees the atomics provide.

        0 replies 0 retweets 1 like
      4. End of conversation
      1. New conversation
      2. Lucio Franco‏ @lucio_d_franco 15 Jul 2019
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        Replying to @yoshuawuyts

        May not be the best intro but I've heard really really good things about this talk around atomicshttps://www.youtube.com/watch?v=A8eCGOqgvH4 …

        1 reply 1 retweet 2 likes
      3. yosh‏ @yoshuawuyts 15 Jul 2019
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        Replying to @lucio_d_franco

        I'll check it out, thanks! :D

        1 reply 0 retweets 2 likes
      4. 2 more replies
      1. gray‏ @fu5ha 15 Jul 2019
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        Replying to @yoshuawuyts

        The Rustonomicon actually has a pretty good page! https://doc.rust-lang.org/nomicon/atomics.html …

        0 replies 1 retweet 7 likes
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      2. Le Quoc Viet‏ @vietlq 15 Jul 2019
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        Replying to @yoshuawuyts

        And this one: https://preshing.com/20120930/weak-vs-strong-memory-models …

        1 reply 1 retweet 3 likes
      3. faern‏ @faernn 15 Jul 2019
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        Replying to @vietlq @yoshuawuyts

        I have heard good things about this one! But have only read a small part of it yet myself

        1 reply 0 retweets 0 likes
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      2. Manish‏ @ManishEarth 15 Jul 2019
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        Replying to @yoshuawuyts

        ugh this is something I wish we had better materials for, I've never found something I liked.

        1 reply 0 retweets 2 likes
      3. Manish‏ @ManishEarth 15 Jul 2019
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        Replying to @ManishEarth @yoshuawuyts

        One thing to note is that some kinds of fudging-with-memory is done by the CPU/cache, and others are done by the compiler (reordering loads etc). This is useful for understanding what's going on under the hood

        1 reply 0 retweets 2 likes
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