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paoloardoino's profile
Paolo Ardoino
Paolo Ardoino
Paolo Ardoino
Verified account
@paoloardoino

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Paolo ArdoinoVerified account

@paoloardoino

CTO @bitfinex + CTO @tether_to [Views are my own]

London
github.com/prdn
Joined January 2010

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    1. Paolo Ardoino‏Verified account @paoloardoino Jul 1

      0.1 + 0.2 = 0.30000000000000004

      40 replies 14 retweets 240 likes
    2. cryp7obi‏ @cryp7obi Jul 1
      Replying to @paoloardoino

      Is that what broke Bitfinex this morning?

      1 reply 0 retweets 0 likes
    3. Paolo Ardoino‏Verified account @paoloardoino Jul 1
      Replying to @cryp7obi

      No lol. We don't use JS in the engine.

      2 replies 0 retweets 8 likes
    4. Sam Reed‏ @STRML_ Jul 1
      Replying to @paoloardoino @cryp7obi

      That said, it's not a JS thing. It's a floating-point thing. If you use floats instead of decimal types for financial math you're gonna have a bad time.

      1 reply 0 retweets 7 likes
    5. Paolo Ardoino‏Verified account @paoloardoino Jul 1
      Replying to @STRML_ @cryp7obi

      Yup. Ruby etc same thing. Just floating-point math, first thing everyone should learn. Still JS (ie. nodejs) would not be a smart move for a matching engine IMHO. Multi-threading is quite needed in order to reach large scale.

      1 reply 0 retweets 2 likes
    6. Sam Reed‏ @STRML_ Jul 1
      Replying to @paoloardoino @cryp7obi

      And while it has threads now - JS is never the right choice for a matching engine. Performance is too unpredictable, deopt still happens for seemingly random reasons, GC leaves a lot to be desired. Still beats python though for speed and convenience for most apps imo.

      1 reply 0 retweets 2 likes
    7. Paolo Ardoino‏Verified account @paoloardoino Jul 1
      Replying to @STRML_ @cryp7obi

      Indeed. Worker threads are quite slow. They don't allow 0-copy memory passing AFAIK. It's basically serialize/deserialize. Eventually I'll be curious to test this stuff. https://www.graalvm.org/reference-manual/js/Multithreading/ …

      1 reply 0 retweets 0 likes
    8. Sam Reed‏ @STRML_ Jul 1
      Replying to @paoloardoino @cryp7obi

      They do transfer actually - we've used it in a few places. But it's *super* tricky. The data basically leaves the Buffer and it throws errors if you try to reuse it. Doesn't jive well with a lot of existing http and ws libs.

      2 replies 0 retweets 1 like
      Paolo Ardoino‏Verified account @paoloardoino Jul 1
      Replying to @STRML_ @cryp7obi

      Ah right. SharedArrayBuffers, we used for compress/decompress in gateway workers. But not super versatile.

      11:12 AM - 1 Jul 2021
      0 replies 0 retweets 0 likes

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