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.

This is the legacy version of twitter.com. We will be shutting it down on June 1, 2020. Please switch to a supported browser, or disable the extension which masks your browser. You can see a list of supported browsers in our Help Center.

  • 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
AndresFreundTec's profile
Andres Freund (Tech)
Andres Freund (Tech)
Andres Freund (Tech)
@AndresFreundTec

Tweets

Andres Freund (Tech)

@AndresFreundTec

Postgres developer, working at Microsoft. Also: politics nerd, expat German in the US. Account for tech related things. For politics: @AndresFreundPol

San Francisco, CA
Joined August 2017

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.

    Andres Freund (Tech)‏ @AndresFreundTec Jan 6
    • Report Tweet
    • Report NetzDG Violation

    Interesting. Doing the necessary rituals of sacrifice to get postgres started with the text segment mapped as huge pages yields nearly 10% speedup in a highly concurrent workload.

    1:59 PM - 6 Jan 2020
    • 4 Retweets
    • 27 Likes
    • Melanie Plageman Ramanna Gunde didier ROS Alicja Kucharczyk Regina Obe Jan Mussler Christoph Kasahara Tatsuhito think(x)
    2 replies 4 retweets 27 likes
      1. New conversation
      2. Andres Freund (Tech)‏ @AndresFreundTec Jan 6
        • Report Tweet
        • Report NetzDG Violation

        7.608 M/sec iTLB-loads w/ 50.80% iTLB-load-misses for normal mapping, vs 1.547 M/sec iTLB-loads w/ 48.82% iTLB-load-misses with text mapped as a huge page.

        1 reply 0 retweets 1 like
        Show this thread
      3. Andres Freund (Tech)‏ @AndresFreundTec Jan 6
        • Report Tweet
        • Report NetzDG Violation

        The magic necessary (linker flags to align the text sufficiently, link to libhugetlbfs, editing elf headers with hugeedit --text, setting up accessible hugetlbfs) seems too big for most, but I wonder if there's a way that could be simplified.

        1 reply 0 retweets 5 likes
        Show this thread
      4. Andres Freund (Tech)‏ @AndresFreundTec Jan 6
        • Report Tweet
        • Report NetzDG Violation

        Oh, and besides being complicated: It currently also breaks perf profiles...

        1 reply 0 retweets 1 like
        Show this thread
      5. End of conversation
      1. New conversation
      2. Thomas Munro‏ @MengTangmu Jan 6
        • Report Tweet
        • Report NetzDG Violation
        Replying to @AndresFreundTec

        Thomas Munro Retweeted Thomas Munro

        Nice. #FreeBSD does this already (though admittedly I'd liek to have more control over whether it does it, which is more of an issue for DSM segments than the text segment, for eg parallel hash joins; on Linux the answer there is also "never").https://twitter.com/MengTangmu/status/1135003656032587776 …

        Thomas Munro added,

        Thomas Munro @MengTangmu
        I heard a claim that some DB goes up to ~6% faster in some benchmark when the code is mapped with huge pages, on Linux, which (for now) requires special linking and a hugectl wrapper to remap. But #PostgreSQL text segment is automagically in super pages on my #FreeBSD box. Woo!
        1 reply 2 retweets 1 like
      3. Andres Freund (Tech)‏ @AndresFreundTec Jan 6
        • Report Tweet
        • Report NetzDG Violation
        Replying to @MengTangmu

        It does? For it to work well one needs to make sure that the text segment and data/bss segments are far enough apart to fit onto separate 2MB huge pages. Otherwise you'd give up sharing the text segment, which'd again have its own cost.

        1 reply 0 retweets 0 likes
      4. 3 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