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pcwalton's profile
Patrick Walton
Patrick Walton
Patrick Walton
@pcwalton

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Patrick Walton

@pcwalton

Research engineer at Mozilla

San Francisco, CA
pcwalton.github.io
Joined November 2009

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    Patrick Walton‏ @pcwalton 2 Apr 2019
    • Report Tweet
    • Report NetzDG Violation

    It’s really hard to design APIs that: 1. Encourage fine-grained multicore parallelism 2. Don’t force any threading model on end users or create threads behind the user’s back 3. Are simple and easy to use

    2:11 PM - 2 Apr 2019
    • 5 Retweets
    • 117 Likes
    • Rhaladriel flaper87 naughty messy daddy 🐖 Web Surfer 🏄🌎 Brian Christie Jed Davis 🏳️‍🌈 ʟʟoɢiq Robert Graebert Dale Blackburn
    10 replies 5 retweets 117 likes
      1. Patrick Walton‏ @pcwalton 2 Apr 2019
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        This is probably the #1 thing holding up parallelization of libraries like libpng, for instance. It’s tough in Pathfinder, which really depends on multicore to get the best performance.

        2 replies 0 retweets 11 likes
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      2. Gok‏ @Gok 2 Apr 2019
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        Replying to @pcwalton

        Honestly is data parallelism on the CPU ever *really* what you want? :)

        2 replies 0 retweets 0 likes
      3. Patrick Walton‏ @pcwalton 2 Apr 2019
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        Replying to @Gok

        Well, in my case, yes, because (a) I want to pipeline between CPU and GPU; (b) I have to work on older GPUs or bad drivers that don’t expose working compute shader.

        2 replies 0 retweets 0 likes
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      2. Patrick Walton‏ @pcwalton 2 Apr 2019
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        Replying to @jhripley

        By “fine-grained” I mean “data-parallel at all”.

        0 replies 0 retweets 4 likes
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      1. brianloveswords‏ @brianloveswords 2 Apr 2019
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        Replying to @pcwalton

        thanks for tweeting this, I was really struggling with this, particularly having something easy to use that didn't create secret threads and it's good to know that this is a design challenge for other folks, too.

        0 replies 0 retweets 6 likes
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      1. kornel@mastodon.social‏ @kornelski 2 Apr 2019
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        Replying to @pcwalton

        #2 is so true. For http://gif.ski  C API I've created an unusable monster. And I'm currently rewriting it from a forced threading model to creating threads behind the user's back :D

        0 replies 0 retweets 1 like
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      1. Dave Lucia‏ @davydog187 3 Apr 2019
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        Replying to @pcwalton

        Easy! Just implement in Erlang/Elixir 😂 Jokes aside, they are well suited for solving these sorts of problems. However not great for building systems libraries like libpng. It’s been fun using Rust for the past few months and seeing both sides of this

        0 replies 0 retweets 1 like
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      1. ferris  🚀‏ @im_ferris 2 Apr 2019
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        Replying to @pcwalton

        Do you think there’s hope of providing a clean way to separate composition from execution?

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      1. Sergei‏ @Serezha 2 Apr 2019
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        Replying to @pcwalton

        For LayoutKit we made its data structures immutable so that they can be transferred between threads without locking. And the methods we made pure and (mostly) thread-independent :-)

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