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TimSweeneyEpic's profile
Tim Sweeney
Tim Sweeney
Tim Sweeney
@TimSweeneyEpic

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Tim Sweeney

@TimSweeneyEpic

Epic Games founder & CEO

epicgames.com
Joined August 2013

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    1. WEREMSOFT‏ @WEREMSOFT Apr 5
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      Off course, we don't use light in the vacuum to move data from the memory to the CPU, in a straight line, we use electricity through copper wires that needs to trace big hooks to avoid electronic components in the motherboard. To solve this problem, the CPU uses cache.

      1 reply 0 retweets 8 likes
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    2. WEREMSOFT‏ @WEREMSOFT Apr 5
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      In the following image, we can see how much the processor needs to wait for the data, depending in which cache is located. Think about "cycles" as the amount of time your CPU can not work on your problem because is waiting for data.pic.twitter.com/YaIxDUub9G

      1 reply 1 retweet 20 likes
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    3. WEREMSOFT‏ @WEREMSOFT Apr 5
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      This was nicely explained in detail by @mike_acton on his GDC talk "Data Oriented Design in C++".https://www.youtube.com/watch?v=rX0ItVEVjHc …

      1 reply 0 retweets 17 likes
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    4. WEREMSOFT‏ @WEREMSOFT Apr 5
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      We can talk a lot about this subject, but the bottom line is that if you don't use you cache in a smart way, your program becomes very very slow. The way to be FAST is to put the data we want to process together process it in batch.

      1 reply 0 retweets 7 likes
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    5. WEREMSOFT‏ @WEREMSOFT Apr 5
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      A good way to prove this, is traversing matrices row by row (very efficient because the data is contiguous) or column by column (very inefficient) because the CPU needs to chase the data jumping a row length in the memory.pic.twitter.com/mGyfyLdKM1

      1 reply 0 retweets 13 likes
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    6. WEREMSOFT‏ @WEREMSOFT Apr 5
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      Take a look in to the following tests I did in different languages: C++, C, Java, javascript...we have that the code is 19x faster if we manage to have it together. Doesn't matters which language your are using.pic.twitter.com/ngeGt4u0Vi

      3 replies 2 retweets 13 likes
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    7. WEREMSOFT‏ @WEREMSOFT Apr 5
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      Take a look at this graphs and compare it with the ones that we use SIMD and multithreading. The performance gain we get with multithreading and SIMD is NOTHING compared with the performance increase we have if we code in a way that use the CPU cache efficiently.pic.twitter.com/J7rZ6JfvWd

      2 replies 6 retweets 24 likes
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    8. WEREMSOFT‏ @WEREMSOFT Apr 5
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      Webassembly is not better because it allows us to use multi thread and SIMD, but because allows us to handle memory in a more efficient way in the browser. This knowledge was tabu in the frontend world, where frameworks like Angular and React are kings. But not anymore.

      2 replies 1 retweet 30 likes
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    9. WEREMSOFT‏ @WEREMSOFT Apr 5
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      As frontend developers, we need to learn about hardware if we want to innovate and take the web development to the next level. I was looking into this subject for a while now and I was thinking on write a series of articles in a blog format, since the subject is huge.

      2 replies 3 retweets 49 likes
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    10. WEREMSOFT‏ @WEREMSOFT Apr 5
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      Sorry for the typos. I'll try to put my experiences in a format that I can control more and where I can post code examples, I'm thinking about @Medium . Stay tuned.

      5 replies 0 retweets 44 likes
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      Tim Sweeney‏ @TimSweeneyEpic Apr 5
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      Replying to @WEREMSOFT @Medium

      What kinds of existing web apps benefit from low level optimizations like SIMD and cache-efficient data access patterns? Of all the web pages I use, I really can't think of any that operated on more than reasonably small bundles of DOM objects...

      1:43 PM - 5 Apr 2020
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      • Vasilis Poulimenos Spiro Gulgas Jon Bonazza The alternator RICHLAND GAMES Caleb Allen William Christianson Michael Bridges Complete Bipartite Graph K3,3
      4 replies 0 retweets 12 likes
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        2. WEREMSOFT‏ @WEREMSOFT Apr 7
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          Replying to @TimSweeneyEpic @Medium

          Well, this is a tricky question. I'll say, don't think on webpages only, but in products that were created using web technologies: @SlackHQ , @code, @discord, @AtomEditor and anything created with @electronjs. Also, you can run Webassembly in @nodejs in the backend.

          1 reply 0 retweets 0 likes
        3. WEREMSOFT‏ @WEREMSOFT Apr 7
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          Replying to @WEREMSOFT @TimSweeneyEpic and

          One very specific example: Casino Games. The most important thing for a casino game that provide games on smartphones is to have the player in the game for as long as possible. Most of them uses HTML5 canvas to develop games. A game uses 50% less battery means 2x money.

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        2. Luca Sas‏ @SasLuca Apr 7
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          Replying to @TimSweeneyEpic @WEREMSOFT @Medium

          I would say web apps would benefit from better resource management and less bloat, less so SIMD or any more involved optimizations. Honestly though, with some web apps I can't even tell what could possibly be the bottleneck given how simple they are yet they are still slow!

          1 reply 0 retweets 0 likes
        3. WEREMSOFT‏ @WEREMSOFT Apr 7
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          Replying to @SasLuca @TimSweeneyEpic @Medium

          Something I tried to show in the thread, is that SIMD and Multithread performance gains are nothing compared with the performance you have if you code your programs with CPU cache efficiency in mind.

          1 reply 0 retweets 0 likes
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        2. Januario Pinto‏ @Januario_Pinto Apr 5
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          Replying to @TimSweeneyEpic @WEREMSOFT @Medium

          Couldn't agree more, games. And webgl applications.

          1 reply 0 retweets 0 likes
        3. Jon Bonazza‏ @nerdwithdice Apr 5
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          Replying to @Januario_Pinto @TimSweeneyEpic and

          Which are extremely niche problems in the webdev ecosystem and generally not created by "frontend developers."

          0 replies 0 retweets 0 likes
        4. End of conversation
        1. Vanish Max‏ @itspapamax Apr 5
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          Replying to @TimSweeneyEpic @WEREMSOFT @Medium

          I didn’t understand one of these words @TimSweeneyEpic, a word that I do understand is trios

          0 replies 0 retweets 0 likes
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