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How to check if RAM I/O bandwidth is a bottleneck for my application on Linux Ubuntu?

mm flag

I have two Ubuntu systems (A & B) The same application performs much better on the system A even though A has less cores and less RAM. On System B, there are many more cores and much more RAM but the RAM speed is slower.

I highly suspect the bottleneck is due to RAM speed on System B, however I want to confirm this somehow before upgrading the RAM.

What process can I follow to ensure that the application is running poorly on System B because the RAM speed is low?

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