1.TTL和LRU之間的關係

當LRU的時間T設定為“特徵時間”時，LRU的 效能收斂於TTL（ the performance of LRU converges to that of a TTL cache with a timer set to the characteristic time. ）。2.

什麼是特徵時間：命中率，請求的流行度，快取容量：

2.論文的貢獻

假設：獨立平穩的隨機點過程

貢獻：①LRU政策下的收斂速度收斂域TTL條件下的

 ②derive rates of convergence for individual content hit probabilities under LRU to those under TTL using the LRU characteristic time.

③derive expressions for the characteristic time and the aggregate hit probability in the limit as the cache size and the number of contents go to infinity