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.

For the best Twitter experience, please use Microsoft Edge, or install the Twitter app from Microsoft Store.

  • 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
pcwalton's profile
Patrick Walton
Patrick Walton
Patrick Walton
@pcwalton

Tweets

Patrick Walton

@pcwalton

Research engineer at Mozilla

San Francisco, CA
pcwalton.github.io
Joined November 2009

Tweets

  • © 2020 Twitter
  • About
  • Help Center
  • Terms
  • Privacy policy
  • Imprint
  • 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.

    Patrick Walton‏ @pcwalton 18h18 hours ago
    • Report Tweet

    Rust compiler performance is hard to have meaningful discussions about because: (1) There’s no single part of the compiler which is slow. In fact the compiler is pretty well optimized.

    11:16 AM - 2 Feb 2020
    • 10 Retweets
    • 132 Likes
    • showjackyang steveklabnik 🚲🚎🥑 gavin Ladi ADENIRAN carlitos infinitesimal Irbis Labs 🙀 路邊的野貓不要踩 😻
    8 replies 10 retweets 132 likes
      1. Patrick Walton‏ @pcwalton 18h18 hours ago
        • Report Tweet

        (2) There’s no high-profile language design decision you can point to and say “aha, that was a mistake!” No header files, for example. The slowness comes from a lot of smaller things that have real benefits, such as the borrow check.

        9 replies 4 retweets 83 likes
        Show this thread
        Thanks. Twitter will use this to make your timeline better. Undo
        Undo
      1. New conversation
      2. Lefteris Stamatogiannakis‏ @estama2 16h16 hours ago
        • Report Tweet
        Replying to @pcwalton

        What % of the total compilation time is due to the checks? Maybe a quick no-check compilation mode would be beneficial for quick edits? Programming has a rhythm where big changes are followed by many smaller ones. A no-check compilation may be useful for the small changes.

        4 replies 0 retweets 3 likes
      3. ʟʟoɢiq‏ @llogiq 15h15 hours ago
        • Report Tweet
        Replying to @estama2 @pcwalton

        That very much depends on your code. Rust's type system for example is very powerful, but actually using that power will cost compile time.

        0 replies 0 retweets 3 likes
      4. End of conversation
      1. New conversation
      2. AVX-512‏ @512Avx 11h11 hours ago
        • Report Tweet
        Replying to @pcwalton

        trait bounds resolution has something extremely non linear in it, i can point to that

        1 reply 0 retweets 1 like
      3. AVX-512‏ @512Avx 11h11 hours ago
        • Report Tweet
        Replying to @512Avx @pcwalton

        i guess i should do the work if creating a minimal example and submit a pr

        0 replies 0 retweets 4 likes
      4. End of conversation
      1. New conversation
      2. Tony “Abolish ICE” Arcieri  🦀‏ @bascule 11h11 hours ago
        • Report Tweet
        Replying to @pcwalton

        How about a secure distribured compiler cache?

        1 reply 0 retweets 9 likes
      3. 2 more replies
      1. New conversation
      2. glandium‏ @MikeHommey 10h10 hours ago
        • Report Tweet
        Replying to @pcwalton

        @nnethercote's work would tend to contradict this.

        1 reply 0 retweets 0 likes
      3. Nicholas Nethercote‏ @nnethercote 7h7 hours ago
        • Report Tweet
        Replying to @MikeHommey @pcwalton

        I would say that 3 years ago it wasn't well optimized, and finding improvements was really easy. Today it's much harder. So I think "pretty well optimized" is a reasonable description.

        0 replies 0 retweets 5 likes
      4. End of conversation
      1. New conversation
      2. Anatoly Yakovenko‏ @aeyakovenko 18h18 hours ago
        • Report Tweet
        Replying to @pcwalton

        What about memorization and parallelism?

        1 reply 0 retweets 1 like
      3. Jonas Schievink‏ @sheevink 18h18 hours ago
        • Report Tweet
        Replying to @aeyakovenko @pcwalton

        Rustc already does both of those to some degree

        1 reply 0 retweets 9 likes
      4. 9 more replies

    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

      • © 2020 Twitter
      • About
      • Help Center
      • Terms
      • Privacy policy
      • Imprint
      • Cookies
      • Ads info