University of Pennsylvania, CIS 565: GPU Programming and Architecture, Project 0

• Xuntong Liang
  • LinkedIn, GitHub, twitter.
• Tested on: Windows 10, i7-10750H @ 2.60GHz 16GB, RTX 2070 Super with Max-Q 8192MB

CUDA running result:

Analysis:

This needs us to go to Nsight -> Nsight Systems 2021.2.4 -> Trace.

Then in NVIDIA Nsight Systems 2021.2.4 , Select target for profiling -> Start. Make sure to fill in the correct Command line with arguments and Working directory in Target application, and check Collect CUDA trace and Collect OpenGL trace.

Debug with Nsight:

The blockIdx is (12, 0, 0) and the threadIdx is (8, 1, 0). The thread counts from the Shader Info are discontinuous, and the threads between these thread indices are shown in Threads. We need to calculate that which is (8, 1, 0). Since the blockDim is (16, 16, 1), threads represented by (x, 1, 0) should be in the third or fourth group of threads. Then we can count x = 8, and find the corresponding thread, which is the first thread of the fourth group of threads.

Check WebGL support:

DXR test, with color (0.2, 0.4, 0.8):