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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 5 Dec 2017
    • Report Tweet
    • Report NetzDG Violation

    Most of the time, the integrated Intel Iris on my MBP beats the Radeon in perf (by a lot, like 2x). I have no idea why.

    1:05 PM - 5 Dec 2017
    • 2 Retweets
    • 7 Likes
    • Antony Courtney Diego Bernardes Brendan Zabarauskas Tristan Hume 6d65 russell Anti- jameschurchman [S] nachokb
    5 replies 2 retweets 7 likes
      1. Patrick Walton‏ @pcwalton 5 Dec 2017
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        Replying to @andreasgal

        I’m told the front end of the compiler is all Apple and compiles to a shared IR, but the backends are blobs provided by the GPU vendors

        0 replies 0 retweets 0 likes
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      2. Ted Mielczarek‏ @TedMielczarek 5 Dec 2017
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        Replying to @pcwalton

        Is there a switching cost that doesn't amortize well for short benchmarks?

        1 reply 0 retweets 0 likes
      3. Patrick Walton‏ @pcwalton 5 Dec 2017
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        Replying to @TedMielczarek

        Happens even if I force discrete.

        0 replies 0 retweets 0 likes
      4. End of conversation
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      2. Phil Dennis-Jordan‏ @pmjordan 5 Dec 2017
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        Replying to @pcwalton

        There's a lot of things that could be going on. Unified memory architecture helps some tasks. Mac OpenGL drivers are awful, etc.

        1 reply 0 retweets 2 likes
      3. Phil Dennis-Jordan‏ @pmjordan 5 Dec 2017
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        Replying to @pmjordan @pcwalton

        IIRC Intel GPUs also blowing away both nVidia + AMD for Geometry Shader performance. Doubt you're using those tho, not sure Mac GL has them.

        1 reply 0 retweets 0 likes
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      2. Rik Arends‏ @rikarends 5 Dec 2017
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        Replying to @pcwalton

        could it be memory is less far away on intel gpus? for datastructures and dependent reads.. possibly

        1 reply 1 retweet 0 likes
      3. rich.gg‏ @AndyWaro 5 Dec 2017
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        Replying to @rikarends @pcwalton

        I don't get how you guys can be so much into GPUs and into Macs at the same time. Ever hear of Razor, Alienware, XPS, Gygabites or MSI ?

        2 replies 0 retweets 0 likes
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      1. Robert Monfera‏ @monfera 5 Dec 2017
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        Replying to @pcwalton

        surprising, could the Radeon be bandwidth limited on these tasks, while integrated is using shared memory? or is the task fill rate limited? also, MBP is reported to throttle discrete GPUs in some cases too

        0 replies 0 retweets 1 like
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      1. Joe Wilm‏ @i_am_jwilm 5 Dec 2017
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        Replying to @pcwalton

        Tried using half floats for vertex data in alacritty. Huge win on Iris and absolutely bombed on Radeon

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      1. Julian Viereck‏ @jviereck 9 Dec 2017
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        Replying to @andreasgal @pcwalton

        curios: what ML library do you benchmark/use?

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