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wycats's profile
Yehuda Katz 🥨
Yehuda Katz 🥨
Yehuda Katz  🥨
Verified account
@wycats

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Yehuda Katz  🥨Verified account

@wycats

Tilde Co-Founder, OSS enthusiast and world traveler.

Portland, OR
yehudakatz.com
Joined August 2007

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    1. Who ordered *that*?‏ @ManishEarth 14 Nov 2017

      Is it just me or does the Go community use a different definition of "concurrency" vs "parallelism"? The "standard" one is afaict "parallelism is one way of getting concurrency", whereas Go seems to use it specifically to talk about interleaving.

      7 replies 0 retweets 11 likes
      Show this thread
    2. Yehuda Katz  🥨‏Verified account @wycats 14 Nov 2017
      Replying to @ManishEarth

      Concurrency means two tasks making progress at the same time. Parallelism means two tasks using the CPU at the same time. Right?

      4 replies 0 retweets 6 likes
    3. Who ordered *that*?‏ @ManishEarth 14 Nov 2017
      Replying to @wycats

      In my understanding, yes.

      1 reply 0 retweets 0 likes
      Yehuda Katz  🥨‏Verified account @wycats 14 Nov 2017
      Replying to @ManishEarth

      How does this differ from Go's definition.

      7:11 PM - 14 Nov 2017
      2 replies 0 retweets 0 likes
        1. New conversation
        2. Who ordered *that*?‏ @ManishEarth 14 Nov 2017
          Replying to @wycats

          Go's definition makes concurrency and parallelism mutually exclusive, i.e. 1:1 kernel threading is parallel but not concurrent.

          3 replies 0 retweets 0 likes
        3. Who ordered *that*?‏ @ManishEarth 14 Nov 2017
          Replying to @ManishEarth @wycats

          To be clear, this is my impression of Go's definition from seeing folks use it that way. Hence the "is it just me or".

          0 replies 0 retweets 0 likes
        4. End of conversation
        1. New conversation
        2. Akash Bhardwaj‏ @akashbdj 14 Nov 2017
          Replying to @wycats @ManishEarth

          If two tasks are making progress at the same time, aren’t they also using the CPU at the same time? I’m new to all of this. Just trying to understand.

          1 reply 0 retweets 0 likes
        3. Yehuda Katz  🥨‏Verified account @wycats 14 Nov 2017
          Replying to @akashbdj @ManishEarth

          Most of the time, when a task is "making progress" it's waiting for some response (and is "idling"). What lang do you write in primarily? I can try to give you a localized example :)

          1 reply 0 retweets 1 like
        4. Akash Bhardwaj‏ @akashbdj 14 Nov 2017
          Replying to @wycats @ManishEarth

          I primarily write JavaScript. Mostly frontend development.

          2 replies 0 retweets 0 likes
        5. Who ordered *that*?‏ @ManishEarth 14 Nov 2017
          Replying to @akashbdj @wycats

          Javascript is concurrent but not parallel in a single worker. Web workers make JS parallel. In JS tasks are interleaved but a single unit of execution (like adding two numbers) won't run in parallel with another. Unless that's in a web worker.

          1 reply 0 retweets 1 like
        6. Who ordered *that*?‏ @ManishEarth 14 Nov 2017
          Replying to @ManishEarth @akashbdj @wycats

          Though in JS specifically the unit of execution spans the entire task in the event loop (i.e. the entire set of non-async non-callback code you wrote). Async code lets you write a series of tasks as a single unit easily.

          1 reply 0 retweets 1 like
        7. Who ordered *that*?‏ @ManishEarth 14 Nov 2017
          Replying to @ManishEarth @akashbdj @wycats

          When we say "making progress at the same time", it means that there is a point in time at which both tasks are at partial progress. I.e. we don't just run them one after the other, there's interleaving.

          0 replies 0 retweets 1 like
        8. End of conversation

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