1748
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Ran 08 May 2016 01:09AM UTC

Jobs 1

Files 65

Run time 3s

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Build # 1748

Build Type

push

travis-ci

Committed by

ben-manes

Commit Message

Improved adaptive W-TinyLFU for recency workloads

Added four traces from cache2k for a Java e-commerce webapp. Two traces
are for an ORM and are extremely recency skewed. I suspect that this is
Hibernate's cache, which is usually flushed regularly to avoid stale
data. In this case LRU is the near optimal policy.

TinyLFU does poorly when recency is dominant. W-TinyLFU helps, but the
window is static and may be too small for the workload. The new adaptive
version is excellent, though. It correctly adjusts to emulate LRU while
still being able to return to a leveraging TinyLFU if the workload
changes. This helps to make the policy more robust for different usages.

Caffeine will under perform in this case until adaption is integrated in
a future iteration.

Coverage Stats

5326 of 5636 relevant lines covered (94.5%)

0.94 hits per line

Jobs

ID	Job ID	Ran	Files	Coverage
1	1748.1 (TERM=dumb)	08 May 2016 01:09AM UTC	0	94.5	Travis Job 1748.1

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