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mathias's profile
Mathias Bynens
Mathias Bynens
Mathias Bynens
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@mathias

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Mathias BynensVerified account

@mathias

I work on @ChromeDevTools & @v8js at Google and on ECMAScript through TC39. ♥ JavaScript, HTML, CSS, HTTP, performance, security, Bash, Unicode, i18n, macOS.

Munich, Germany
mths.be
Joined January 2007

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    1. Ingvar Stepanyan‏ @RReverser 3 May 2019
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      Just realised today that I don't really know how CPU throttling works in Chrome DevTools. Does it slow down just the JavaScript parts or exposed native APIs too? What about V8 internals like parsing/compilation?

      2 replies 1 retweet 24 likes
    2. Patrick Meenan‏ @patmeenan 3 May 2019
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      Replying to @RReverser

      I believe it adds delays to the event loop in all threads and processes and effectively slows down all operations that the loop manages. For JS specifically it produced identical results to using cgroups for parse/eval/etc. Much better than the net throttling.

      2 replies 0 retweets 6 likes
    3. Ingvar Stepanyan‏ @RReverser 3 May 2019
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      Replying to @patmeenan

      Interesting. If it adds static delays and works at event loop level, I'd expect it to only affect async tasks, but that's obviously not the case.

      2 replies 0 retweets 1 like
    4. Ingvar Stepanyan‏ @RReverser 3 May 2019
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      Replying to @RReverser @patmeenan

      To clarify - not doubting what you're saying, just curious if the specific approach is documented anywhere.

      1 reply 0 retweets 0 likes
    5. Patrick Meenan‏ @patmeenan 3 May 2019
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      Replying to @RReverser

      http://cs.chromium.org . Don't think it's documented outside of the actual code but the code search is really good. There may be a design doc somewhere but they aren't aggregated.

      1 reply 0 retweets 1 like
      Mathias Bynens‏Verified account @mathias 3 May 2019
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      Replying to @patmeenan @RReverser

      Currently, DevTools CPU throttling works by sleeping a portion of the time period. E.g. on 5× CPU throttling, DevTools allows the CPU to do 40 microseconds of work and then sleeps for 160 microseconds. https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/scheduler/common/thread_cpu_throttler.cc?rcl=cd1757ee7ed27272b2baef65afefdd040bd1a838 …

      8:01 PM - 3 May 2019
      • 18 Retweets
      • 65 Likes
      • Ricardo Machado Sasha Fly-Style Jason Miller 🦊⚛ lukejacksonn Patrick Meenan Johannes Ewald Sasha Chu Frank Holtmann Artem Trytiak
      5 replies 18 retweets 65 likes
        1. Ingvar Stepanyan‏ @RReverser 4 May 2019
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          Replying to @mathias @patmeenan

          Thanks!

          0 replies 0 retweets 2 likes
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        2. Ben Smith‏ @binjimint 4 May 2019
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          Replying to @mathias @patmeenan @RReverser

          (For those that don't want to read the code): it adds a signal handler to the main thread, then creates a new thread that periodically sends signals to the main thread. When the main thread receives the signal, it will spin loop for some time (as described above), then resume.

          2 replies 2 retweets 11 likes
        3. Ben Smith‏ @binjimint 4 May 2019
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          Replying to @binjimint @mathias and

          On Windows it uses SuspendThread/ResumeThread instead of signals. Spin looping is used for higher precision (according to the comments), but will use more CPU. Because it works at thread granularity, it should affect all code running on that thread, not just JavaScript.

          0 replies 0 retweets 7 likes
        4. End of conversation
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        2. Jason Miller  🦊 ⚛‏ @_developit 4 May 2019
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          Replying to @mathias @patmeenan @RReverser

          Indeed. I like to point this out to folks when CPU throttling kills their battery at conferences (lol @kristoferbaxter)

          1 reply 0 retweets 12 likes
        3. Kristofer Baxter‏ @kristoferbaxter 4 May 2019
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          Replying to @_developit @mathias and

          Just need a bigger battery! Context: I leave CPU/Network throttling on always for the current tab used for development.

          2 replies 0 retweets 3 likes
        4. 1 more reply
        1. Johannes Ewald‏ @Jhnnns 4 May 2019
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          Replying to @mathias @patmeenan @RReverser

          This means that native APIs are affected too?

          0 replies 0 retweets 0 likes
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        1. Rodrigo Pombo‏ @pomber 4 May 2019
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          Replying to @mathias @patmeenan @RReverser

          is it just for the main thread?

          0 replies 0 retweets 0 likes
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