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GourdErwa avatar GourdErwa commented on July 24, 2024
  • cache 可预借时间,吞吐量可大于序列最大值
  • 你说的位移完成,怎么完成呢,读可以控制为非并发,写肯定要并发的,位移如何保证并发

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gearcode avatar gearcode commented on July 24, 2024

我也不太明白,是否因为默认时间粒度为秒,导致每秒内的并发度非常高,所以需要ringbuffer?
我以前一直用毫秒的,sequence原子类型自增就好了,这样性能也不差吧?

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DanielFeb avatar DanielFeb commented on July 24, 2024

并发很高的情况下,如果没有buffer,一个变量自增,cpu cache line的写冲突会很严重。 而且像 CAS 这种机制适合冲突较少的情况,如果太多线程在同时自旋,那么长时间循环会导致 CPU 开销很大。

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