Thur., Dec 19, 2013

Pin Yi Tsai

WEEKLY REPORT

OUTLINE

• Test about Bank Conflict of Shared Memory• Tesla M2050

Read Write

• Reference

TESLA M2050

• 448 CUDA cores

• Each SM features 32 CUDA processors => 14 SMs

• Number of shared memory banks: 32

• Each bank has a bandwidth of 32 bits every two clock cycles, and successive 32-bit words are assigned to successive banks

READ 10000 TIMES FROM SHARED MEMORY

• With bank conflict [(threadIdx.x)%N+(threadIdx.x%5)*32] 16-way: 610.16 ms 8-way: 610.149 ms 4-way: 609.832 ms 2-way: 609.294 ms

• Without bank conflict 603.944 ms

WRITE 1000 TIMES FROM SHARED MEMORY

• With bank conflict [(threadIdx.x)%N+(threadIdx.x%5)*32] 16-way: 301.033 ms 8-way: 300.821 ms 4-way: 285.678 ms 2-way: 255.378 ms

• Without bank conflict 243.473 ms

REFERENCE

• About Tesla Specification:

http://en.wikipedia.org/wiki/Nvidia_Tesla

• About Fermi Architecture:

http://www.nvidia.com/content/PDF/fermi_white_papers/NVIDIA_Fermi_Compute_Architecture_Whitepaper.pdf

• About Bank:

http://docs.nvidia.com/cuda/pdf/CUDA_C_Best_Practices_Guide.pdf

The End