Skip to content
By using Twitter’s services you agree to our Cookies Use. We and our partners operate globally and use cookies, including for analytics, personalisation, and ads.
  • Home Home Home, current page.
  • About

Saved searches

  • Remove
  • In this conversation
    Verified accountProtected Tweets @
Suggested users
  • Verified accountProtected Tweets @
  • Verified accountProtected Tweets @
  • Language: English
    • Bahasa Indonesia
    • Bahasa Melayu
    • Català
    • Čeština
    • Dansk
    • Deutsch
    • English UK
    • Español
    • Filipino
    • Français
    • Hrvatski
    • Italiano
    • Magyar
    • Nederlands
    • Norsk
    • Polski
    • Português
    • Română
    • Slovenčina
    • Suomi
    • Svenska
    • Tiếng Việt
    • Türkçe
    • Ελληνικά
    • Български език
    • Русский
    • Српски
    • Українська мова
    • עִבְרִית
    • العربية
    • فارسی
    • मराठी
    • हिन्दी
    • বাংলা
    • ગુજરાતી
    • தமிழ்
    • ಕನ್ನಡ
    • ภาษาไทย
    • 한국어
    • 日本語
    • 简体中文
    • 繁體中文
  • Have an account? Log in
    Have an account?
    · Forgot password?

    New to Twitter?
    Sign up
wycats's profile
Yehuda Katz 🥨
Yehuda Katz 🥨
Yehuda Katz  🥨
Verified account
@wycats

Tweets

Yehuda Katz  🥨Verified account

@wycats

Tilde Co-Founder, OSS enthusiast and world traveler.

Portland, OR
yehudakatz.com
Joined August 2007

Tweets

  • © 2018 Twitter
  • About
  • Help Center
  • Terms
  • Privacy policy
  • Cookies
  • Ads info
Dismiss
Previous
Next

Go to a person's profile

Saved searches

  • Remove
  • In this conversation
    Verified accountProtected Tweets @
Suggested users
  • Verified accountProtected Tweets @
  • Verified accountProtected Tweets @

Promote this Tweet

Block

  • Tweet with a location

    You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more

    Your lists

    Create a new list


    Under 100 characters, optional

    Privacy

    Copy link to Tweet

    Embed this Tweet

    Embed this Video

    Add this Tweet to your website by copying the code below. Learn more

    Add this video to your website by copying the code below. Learn more

    Hmm, there was a problem reaching the server.

    By embedding Twitter content in your website or app, you are agreeing to the Twitter Developer Agreement and Developer Policy.

    Preview

    Why you're seeing this ad

    Log in to Twitter

    · Forgot password?
    Don't have an account? Sign up »

    Sign up for Twitter

    Not on Twitter? Sign up, tune into the things you care about, and get updates as they happen.

    Sign up
    Have an account? Log in »

    Two-way (sending and receiving) short codes:

    Country Code For customers of
    United States 40404 (any)
    Canada 21212 (any)
    United Kingdom 86444 Vodafone, Orange, 3, O2
    Brazil 40404 Nextel, TIM
    Haiti 40404 Digicel, Voila
    Ireland 51210 Vodafone, O2
    India 53000 Bharti Airtel, Videocon, Reliance
    Indonesia 89887 AXIS, 3, Telkomsel, Indosat, XL Axiata
    Italy 4880804 Wind
    3424486444 Vodafone
    » See SMS short codes for other countries

    Confirmation

     

    Welcome home!

    This timeline is where you’ll spend most of your time, getting instant updates about what matters to you.

    Tweets not working for you?

    Hover over the profile pic and click the Following button to unfollow any account.

    Say a lot with a little

    When you see a Tweet you love, tap the heart — it lets the person who wrote it know you shared the love.

    Spread the word

    The fastest way to share someone else’s Tweet with your followers is with a Retweet. Tap the icon to send it instantly.

    Join the conversation

    Add your thoughts about any Tweet with a Reply. Find a topic you’re passionate about, and jump right in.

    Learn the latest

    Get instant insight into what people are talking about now.

    Get more of what you love

    Follow more accounts to get instant updates about topics you care about.

    Find what's happening

    See the latest conversations about any topic instantly.

    Never miss a Moment

    Catch up instantly on the best stories happening as they unfold.

    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
    4. Yehuda Katz  🥨‏Verified account @wycats 14 Nov 2017
      Replying to @ManishEarth

      How does this differ from Go's definition.

      2 replies 0 retweets 0 likes
    5. 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
    6. 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
    7. Akash Bhardwaj‏ @akashbdj 14 Nov 2017
      Replying to @wycats @ManishEarth

      I primarily write JavaScript. Mostly frontend development.

      2 replies 0 retweets 0 likes
      Yehuda Katz  🥨‏Verified account @wycats 15 Nov 2017
      Replying to @akashbdj @ManishEarth

      Ok so, when you write something like: fs.readFile(someFile, () => { done() }); fs.readFile(other, () => { done() }); let count = 2; function done() { if (--count === 0) { // finish up } } There are two "tasks" making progress at the same time ...

      7:43 AM - 15 Nov 2017
      • 1 Like
      • Akash Bhardwaj
      1 reply 0 retweets 1 like
        1. New conversation
        2. Yehuda Katz  🥨‏Verified account @wycats 15 Nov 2017
          Replying to @wycats @akashbdj @ManishEarth

          Because those two file reads are happening at the same time ("concurrently"). But the actual code happens one at a time. The first done() function can't happen literally at the same time as another done() function ("what would that even mean?!" is more or less right) ...

          1 reply 0 retweets 1 like
        3. Yehuda Katz  🥨‏Verified account @wycats 15 Nov 2017
          Replying to @wycats @akashbdj @ManishEarth

          So concurrent just means you kicked off some work for someone else to do, and while you're waiting, you can do other stuff or kick off more work. Parallelism means your code is doing two things simultaneously. In JS, web workers offer parallelism (as @ManishEarth said) but ...

          1 reply 0 retweets 1 like
        4. Yehuda Katz  🥨‏Verified account @wycats 15 Nov 2017
          Replying to @wycats @akashbdj @ManishEarth

          only by preventing from sharing almost all memory directly with the other parallel work. From the perspective of the code that started a worker, the parallel process is just another concurrent task that "someone else" is doing. You just have more control ...

          1 reply 0 retweets 2 likes
        5. Yehuda Katz  🥨‏Verified account @wycats 15 Nov 2017
          Replying to @wycats @akashbdj @ManishEarth

          Most interesting approaches to parallelism are structured around reducing the likelihood of accidentally working on the same object at the same time ("what would that even mean?!" is sometimes called "undefined behavior" or "UB" in C++ jargon)

          1 reply 0 retweets 1 like
        6. Yehuda Katz  🥨‏Verified account @wycats 15 Nov 2017
          Replying to @wycats @akashbdj @ManishEarth

          That was probably too much. Ask away.

          2 replies 0 retweets 0 likes
        7. Akash Bhardwaj‏ @akashbdj 15 Nov 2017
          Replying to @wycats @ManishEarth

          Just a followup: how does the interleaving happen in the browser? Who/what process handles it? Does the browser delegate it to the OS?

          1 reply 0 retweets 0 likes
        8. Who ordered *that*?‏ @ManishEarth 15 Nov 2017
          Replying to @akashbdj @wycats

          The browser controls the JavaScript event loop. The OS scheduler isn't involved.

          0 replies 0 retweets 1 like
        9. End of conversation

      Loading seems to be taking a while.

      Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.

        Promoted Tweet

        false

        • © 2018 Twitter
        • About
        • Help Center
        • Terms
        • Privacy policy
        • Cookies
        • Ads info