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Hierarchical Cache Performance Analysis Under TTL-Based Consistency
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DOI：10.1109/TNET.2014.2320723.png)
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This paper introduces an analytical model for characterizing the instantaneous hit ratio and instantaneous average hit distance of a traditional least recently used (LRU) cache hierarchy. The analysis accounts for the use of two variants of the Time-to-Live (TTL) weak consistency mechanism. The first is the typical TTL scheme (TTL-T) used in the HTTP/1.1 protocol where expired objects are refreshed using conditional GET requests. The second is TTL immediate ejection (TTL-IE) where objects are ejected as soon as they expire. The analysis also accounts for two sharing protocols: Leave Copy Everywhere (LCE) and Promote Cached Objects (PCO). PCO is a new sharing protocol introduced in this paper that decreases the user's perceived latency and is robust under nonstationary access patterns.
Keyword:
Analysis
cache consistency
content-centric network (CCN)
hierarchical cache
least recently used (LRU)
Markov chain
time-to-live (TTL)
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