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I am trying to determine how close to being bandwidth-limited a code I have written is, so I was wondering whether there are any tools out there to determine memory bandwidth usage? The code I have is a command-line *nix code, and if possible I'd like to measure the bandwidth usage on Mac (but Linux is ok too).

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in the equivalent of task manager (task monitor?) there isn't some that will tell you how much bandwidth a process has consumed? – soandos Aug 6 '12 at 11:33

You can use cachegrind. Memory bandwidth is essentially the same as misses in the lowest-level cache.

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