Metal Demo

Transcript

1. GPU Programming in Metal • Twitter: @alienxp03 • Not a GPU programmer
2. Metal • Introduced in iOS 8 • Only for iOS devices • Usage - Graphic rendering - Parallel data computation
3. Basic guide • Initialise Metal
4. Basic guide • Call the compiled shader function
5. Basic guide • Set parameters
6. Basic guide • Threadgroups
7. Basic guide • Run the computation • Get the result
8. Shader language • Using C++11 with some extension and limitation
9. pow(x, y) • 12,228 integers - CPU : 0.028833416668931 secs - GPU : 0.0302730000112206 secs
10. pow(x, y) • 33,554,432 integers (2 ^ 25 ) - CPU : 73.7681545416708 secs - GPU : 38.1098593333445 secs
11. Implementation • Didn’t compare precise::pow vs fast::pow • Initialise the array on CPU, then pass it to GPU for computation • Using CPU cache memory
13. iOS 9 • Metal is now available on OS X too • MTLResourceOptions
14. iOS 9 • Instrument, Metal System Trace
16. Lesson learned • We have GPU too, and it’s pretty powerful • And it’s idle almost the whole time
17. Real world application • For data simulation or visualisation • Though the truth is, I have no idea • Just did it for fun
18. GPU Programming in Metal • Twitter: @alienxp03 • Not a GPU programmer