Reference no: EM133105280
Assignment: Intro to HPC: implement a memory bandwidth benchmark
For this assignment, you are required to implement using x86-64 assembly, a simplified (i.e., single- core) version of the STREAM benchmark. This benchmark measures the memory bandwidth of the computer using simple array operations (kernels).
Considering A, B, C are arrays of length N , and q is a scalar, the four STREAM kernels are the following:
• COPY: A[i] = B[i], for i ≤ N
• SCALE: A[i] = q · B[i], for i ≤ N
• ADD: A[i] = B[i] + C[i], for i ≤ N
• TRIAD: A[i] = B[i] + q · C[i], for i ≤ N
Exercise: For this assignment, your goal is to implement the four STREAM array operations in x86-64 assembly and compare its performance with the default (single-core) STREAM im- plementation. The input arrays should consist of 64 bit unsigned integers. Is the performance better/worse? Why?
Basic requirements:
• Implement the four array operations.
• Find N large enough such that the data does not fit into the CPU cache (i.e., if the array is too small, the bandwidth you measure may be the cache bandwidth).
• Measure the running time of each operation (for this you may use a system call).
• Run each operation 20 times and report average running time.
• Based on the runtime, report the best achieved memory bandwidth.
Extra requirements:
• Vectorize the previously designed code using Intel AVX, or your SIMD instruction set of choice.
• Compare its achieved performance with the basic version. Does it perform better? Why?
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