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slightlylate's profile
Alex Russell
Alex Russell
Alex Russell
@slightlylate

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Alex Russell

@slightlylate

Chrome Project 🐡 & Web Standards TL; Blink API OWNER Named PWAs w/ @phae; probably making her ☕ DMs open. Tweets my own; press@google.com for official comms.

San Francisco, The Internet
infrequently.org
Joined December 2010

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    1. Kevin Marks‏ @kevinmarks 30 Jan 2018
      • Report Tweet
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      Replying to @antumbral

      Did they forget to block align the disk cache?

      2 replies 0 retweets 0 likes
    2. Katelyn Gadd‏ @antumbral 30 Jan 2018
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      Replying to @kevinmarks

      It seems like it's because the disk cache is in a separate chrome worker process, so you eat multiple process context switches to read from it

      2 replies 0 retweets 0 likes
    3. Kevin Marks‏ @kevinmarks 30 Jan 2018
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      Replying to @antumbral

      I wonder if @slightlylate has seen this case.

      2 replies 0 retweets 0 likes
    4. Alex Russell‏ @slightlylate 30 Jan 2018
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      Replying to @kevinmarks @antumbral

      Yep. This is known-bad. Fixes went in last year for read storms, but Scheduling Is Hard (TM) /cc @inexorabletash

      2 replies 0 retweets 1 like
    5. Alex Russell‏ @slightlylate 30 Jan 2018
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      Replying to @slightlylate @kevinmarks and

      The architecture uses 2 reads: the first is for item location (a round-trip via the Browser Process I/O thread) and, in most cases, a second read for the actual body/data

      1 reply 0 retweets 1 like
    6. Alex Russell‏ @slightlylate 30 Jan 2018
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      Replying to @slightlylate @kevinmarks and

      Those are running through a single I/O thread, which means you can often see a pile of index reads delaying body reads. The delay is bonkers-slow.

      3 replies 0 retweets 1 like
    7. Alex Russell‏ @slightlylate 30 Jan 2018
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      Replying to @slightlylate @kevinmarks and

      This used to be much, much worse on image-heavy pages. Randy Smith invested a lot of time on fixing, bit I think progress there is stalled because Reasons

      1 reply 0 retweets 1 like
    8. Alex Russell‏ @slightlylate 30 Jan 2018
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      Replying to @slightlylate @kevinmarks and

      My hope here is that servicification can help. It'll eliminate the single thread at the center of the picture.

      1 reply 0 retweets 0 likes
    9. Katelyn Gadd‏ @antumbral 30 Jan 2018
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      Replying to @slightlylate @kevinmarks @inexorabletash

      Yay! For now I'll look into just building my own in-process cache for these assets using indexedDB and blob URLs. Maybe it'll perform better.

      2 replies 0 retweets 1 like
    10. Kevin Marks‏ @kevinmarks 30 Jan 2018
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      Replying to @antumbral @slightlylate @inexorabletash

      If the assets are all just a few bytes can you just use data urls for them?

      1 reply 0 retweets 0 likes
      Alex Russell‏ @slightlylate 30 Jan 2018
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      Replying to @kevinmarks @antumbral @inexorabletash

      Tiny assets can be encoded in the first read; I forget what the size limit is for that. If s18n works, these questions will all just go away and users with fast disks will just get fast reads :-)

      2:45 AM - 30 Jan 2018
      1 reply 0 retweets 0 likes
        1. New conversation
        2. Katelyn Gadd‏ @antumbral 30 Jan 2018
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          Replying to @slightlylate @kevinmarks @inexorabletash

          It looks like createObjectURL(blob) goes through the disk cache and thus another process. I had the data in my process already, why'd you put it there??? 😭

          1 reply 0 retweets 1 like
        3. Alex Russell‏ @slightlylate 30 Jan 2018
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          Replying to @antumbral @kevinmarks @inexorabletash

          Probably because blob URLs can be shared cross-process :-/

          1 reply 0 retweets 0 likes
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