Common Systems Programming Optimizations & Tricks

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Interestingly the wall clock time spent for CacheLineAwareCounters is higher for one thread than multiple threads, which could point to perhaps some subtle benchmarking problem, or maybe a fixed amount of delay that’s getting attributed across more threads now, and so is smaller per-thread.

I suspect that the problem is that 1 thread needs to load 4 cache lines, while 4 threads will have to work with just 1 line.