Too low memory bandwidth.

Software Tuning, Performance Optimization & Platform Monitoring

Discussion regarding monitoring and software tuning methodologies, Performance Monitoring Unit (PMU) of Intel microprocessors, and platform updating.

Too low memory bandwidth.

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Hi,

I have made the program that conduct 10 independent pointer chase and I have verified 99% of pointer chase step goes to main memory.

My system has maximum memory bandwidth as 59.61GB/s

When I use memory bandwidth monitoring program, one thread can generate about 10GB/s memory bandwidth.

When I increase the number of process, memory bandwidth that each process generate is reduced and I have added all the memory bandwidth value that each process generate, I can only obtain about 32GB/s memory bandwidth.

I can't get more than 32GB/s memory bandwidth even though I increase the number of thread.

So, I think this result comes from bank conflict so leads to low utilization of memory bandwidth.

Is this reasonable explanation?? or Should I consider another factor??

Thank you.

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