Metal for data-parallel computations

グラフィックス以外の分野でのMetalの可能性

iOSDC 2018 LT 発表資料

Transcript

1. άϥϑΟοΫεҎ֎ͷ
   ෼໺ͰͷMetalͷՄೳੑ
   iOSDC 2018 (2018/9/2)
   @kotetu
   

   View Slide

2. Kuriyama Toru (܀ࢁప)
   iOS / Android developer
   ɹɹɹɹɹɹɹɹat
   Sansan app (iOS/Android)
   Twitter: @kotetuɹɹɹɹɹɹ
   Github, Qiita: @kotetuco
   

   View Slide

3. Metal
   • GPUΛ࢖͏ͨΊͷFramework
   • ओʹ3DάϥϑΟοΫεͰ࢖༻
   • άϥϑΟοΫεͰ͔͠࢖͑ͳ
   ͍Θ͚Ͱ͸ͳ͍
   3 / 14
   

   View Slide

4. Metalͷ༻్
   “Render advanced 3D graphics and perform
   data-parallel computations using the GPU.”
   ʮGPUΛ࢖ͬͨߴ౓ͳ3DϨϯμϦϯάͱฒྻॲཧʯ
   https://developer.apple.com/documentation/metal
   4 / 14
   

   View Slide

5. Metalͷ༻్
   “Render advanced 3D graphics and perform
   data-parallel computations using the GPU.”
   ʮGPUΛ࢖ͬͨߴ౓ͳ3DϨϯμϦϯάͱฒྻॲཧʯ
   https://developer.apple.com/documentation/metal
   4 / 14
   3DάϥϑΟοΫεҎ֎ͷ༻్΋૝ఆ
   

   View Slide

6. GPUͷಛੑ
   • 1ίΞ͋ͨΓͷੑೳ͸CPUͷํ͕ߴ͍͕ίΞ਺
   ͸CPUΑΓଟ͍
   • ʮCPU͸εϙʔπΧʔɺGPU͸όεʯ
   • ฒྻॲཧʹ޲͍ͨΞʔΩςΫνϟ
   Ҿ༻ɿiOSDC 2017ʮඈͼಓ۩Ͱ͸ͳ͍Metalʯ(@shu223͞Μ) ൃදࢿྉ
   5 / 14
   

   View Slide

7. ฒྻॲཧͷԸܙΛड͚ͦ͏ͳɹ
   ෼໺
   • ը૾ॲཧ
   • ػցֶश(ਪ࿦)
   • ෺ཧγϛϡϨʔγϣϯ
   6 / 14
   

   View Slide

8. ฒྻॲཧͷԸܙΛड͚ͦ͏ͳɹ
   ෼໺
   • ը૾ॲཧ
   • ػցֶश(ਪ࿦)
   • ෺ཧγϛϡϨʔγϣϯ
   6 / 14
   

   View Slide

9. ը૾ॲཧ
   • Core Image (Core Imageͷը૾ॲཧͷҰ෦͸
   ಺෦ͰMetalΛ࢖༻͍ͯ͠Δ)
   • Core Image͕αϙʔτ͍ͯ͠ͳ͍ը૾ॲཧ͸
   OpenCVͳͲͷը૾ॲཧϥΠϒϥϦΛ࢖͏
   7 / 14
   

   View Slide

10. OpenCV
    • ը૾ॲཧɾίϯϐϡʔλϏδϣϯϥΠϒϥϦ
    • PCͷGPUʹ͸ରԠ͍ͯ͠Δ͕Metalʹ͸ରԠ
    ͍ͯ͠ͳ͍
    • iOS্Ͱ͸GPUͷԸܙΛड͚ΒΕͳ͍
    8 / 14
    

    View Slide

11. ࣮ݧɿը૾ॲཧͷॲཧ࣌ؒɹɹ
    Λൺֱɹɹ
    • OpenCV (CPU)
    • Metal (GPU)
    • Metal Performance Shader ɹɹɹɹɹ
    (MetalΛ࢖ͬͨը૾ɾฒྻॲཧϥΠϒϥϦ)
    9 / 14
    

    View Slide

12. ࢖༻ͨ͠ը૾
    https://pixabay.com/photo-3599450/
    ը૾αΠζɿ5984 × 3989
    ϑΝΠϧαΠζɿ6.9MB (JPEG)
    10 / 14
    

    View Slide

13. ൺֱʹ༻͍ͨը૾ॲཧ
    11 / 14
    1. ೋ஋Խ
    (നࠇը૾΁ม׵)
    2. ը૾ͷॖখ 3. ॖখ + ΅͔͠
    

    View Slide

14. ݕূ༻ΞϓϦ
    • githubʹ͋Γ·͢(Լهࢀর)
    • Xcode 10 (beta 6)
    • iOS11+ (࣮ػ͕ඞཁ)
    • OpenCV 3.4.2
    12 / 14
    https://github.com/kotetuco/ComparisonOfMetalAndOpenCV
    

    View Slide

15. ݕূ݁Ռ
    13 / 14
    ※ ୯Ґ͸ϛϦඵɺ࢖༻୺຤͸ iPhone 8 Plusɹ(iOS11.3.1)
    

    View Slide

16. ݕূ݁Ռ
    13 / 14
    ※ ୯Ґ͸ϛϦඵɺ࢖༻୺຤͸ iPhone 8 Plusɹ(iOS11.3.1)
    Metal͕
    ଎͍
    

    View Slide

17. ·ͱΊ
    • MetalΛ࢖͑͹ඞͣ଎͘ͳΔΘ͚Ͱ͸ͳ͍
    • ୯७ͳฒྻॲཧͰ͸GPU༻ϝϞϦ΁ͷίϐʔ΍
    CPU-GPUؒ௨৴ͷ࣌ؒΛແࢹͰ͖ͳ͍
    • ෳ਺ͷॲཧΛ·ͱΊͯߦ͍͍ͨ৔߹ʹ͸Metal͕༗ར
    • Metal(GPU)ʹ޲͍͍ͯΔ͔Ͳ͏͔ͷݟۃΊ͕େࣄ
    14 / 14
    

    View Slide