Is there a way in c++ to quickly invalidate the L2 cache of a processor other than iterating through a large fake array?
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Is there a way in c++ to quickly invalidate the L2 cache of a processor other than iterating through a large fake array?
I’m going to assume this is for performance testing and you want to eliminate cache effects between runs.
In that case, what you’d need to know to do this efficiently is:
Then it’s basically a matter of touching memory
allocation_sizebytes away from each other until you’ve flushed the cache entirely.Context switching also often invalidates the cache – it might be faster to
waitfor a millisecond and if the OS swaps you in and out, it’ll likely end up clearing the cache.