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raphlinus's profile
Raph Levien
Raph Levien
Raph Levien
@raphlinus

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Raph Levien

@raphlinus

Rust. Fonts. Graphics. Quaker. Independent. he/him

Berkeley, CA
levien.com
Joined May 2009

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    Raph Levien‏ @raphlinus Apr 30
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    • Report NetzDG Violation

    Can Vulkan compete with CUDA for running compute workloads? I believe the answer is a tentative "yes", but more details in my blog post:https://raphlinus.github.io/gpu/2020/04/30/prefix-sum.html …

    12:39 PM - 30 Apr 2020
    • 27 Retweets
    • 111 Likes
    • Sergen Eren marsch zimond 🏳️‍🌈 amit sheokand Dimitri Diakopoulos Melih Szucs Adam Istvan Pablo Delgado PetrSchreiber
    3 replies 27 retweets 111 likes
      1. New conversation
      2. Wunk! 💻 💨‏ @Wunkolo Apr 30
        • Report Tweet
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        Replying to @raphlinus

        On subgroup-size-tuned compute kernels: You mention that the kernel author will have to tune the kernel for each subgroup size but why not use specialization constants so you can emit 1 SPIRV and configure subgroup size at pipeline creation time? https://github.com/linebender/piet-gpu/blob/f56714a1ce3853b2b7d1c8d794c07235468ffc65/piet-gpu-hal/examples/shader/prefix.comp#L39 …

        1 reply 0 retweets 0 likes
      3. Raph Levien‏ @raphlinus Apr 30
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        Replying to @Wunkolo

        Yes, I should probably mention those, they're a good fit for this use case.

        1 reply 0 retweets 0 likes
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      1. Yining Karl Li‏ @yiningkarlli Apr 30
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        Replying to @raphlinus @merelyMark

        Fantastic post! Minor note though: vuda is definitely NOT meant to run CUDA workloads on Vulkan. Vuda just provides a wrapper around the Vulkan host API to make it resemble the CUDA host API, but your compute kernels still have to be Vulkan’s SPIRV, not CUDA’s PTX.

        0 replies 0 retweets 2 likes
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      1. David Peicho‏ @DavidPeicho May 1
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        Replying to @raphlinus

        Nice post! Really useful for me as I am trying to write Morton codes and sort them in WebGPU, so I will most likely need a prefix sum at some point for the radix sort

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