Adaptivity

[ben-manes]

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As you observed with the Youtube trace, the static configuration of W-TinyLFU is not optimal across all workloads. We spent some time exploring options and have a really good solution now.

Caffeine 2.7 includes adaptive window sizing, allowing it to dynamically optimize towards recency or frequency. The below trace chains Corda's bitcoin (recency), Lirs' loop (frequency), and Corda's again. It achieves 39.5% hit rate where optimal is 40.3%, and all other policies are 20% or lower. This is using hill climbing, a decay rate to converge, and a restart threshold of 5% to detect workload changes.

[nqv]

Thank you, I'll take a look