Comment by hu3
5 days ago
> False sharing occurs when multiple cores update different variables in the same cache line.
I got hit by this. In a trading algorithm backtest, I shared a struct pointer between threads that changed different members of the same struct.
Once I split this struct in 2, one per core, I got almost 10x speedup.
Interesting! Did you find out a way to bench this with the built in benchmarking suite?
No it was just a hunch derived from ancient times of SoA vs AoS game dev optimization. I didn't need the perf gain but tried and it worked.