GPU basics
Preliminary
To use CUDA, add module load cuda in your .bashrc or .bash profile on mamba.
Processing on the GPU can be asynchronous, which can lead to time measurement of 0 seconds. Use cudaDeviceSynchronize() to ensure previously submitted tasks have completed.
1 Polynomial expansion (60 pts)
(Code for polynomial expansion on the CPU is given.)
Question: Write a simple CUDA code that allocates and fill an array on the CPU and transfer it to the GPU. (Take array size as a parameter)
Question: Compute the polynomial expansion of each element of the array on the GPU. (Take block size and degree of the polynomial as a parameter.)
Question: Bring the results back on the CPU and confirm the GPU code is correct.
2 Measurements (40 pts)
Question: Measure PCI-express latency. (That is the time for an array of size 1.)
Question: Measure PCI-express Bandwidth. (The initial memory copy for different size of the array.)
Question: Measure GPU memory bandwidth. (Exclude memory copies and use a low degree polynomial.) Question: Measure GPU flops rating. (Exclude memory copies and use a high degree polynomial.)
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