So in this scenario, the cacheline is effectively bouncing between cores at a high frequency. And, since each CPU must invalidate/acknowledge each other CPU, this gets quadratically worse with the number of contenders for the lock. On high CPU count machines this can be very problematic.
Making the minimum region 64MB (16LL<<22) is worth some
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先占住声量，再慢慢迭代，这是互联网行业的基本操作。