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Ran 04 Nov 2020 07:28AM UTC

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Build # 2664

Build Type

push

travis-ci

Committed by

ben-manes

Commit Message

Add Twitter's cache traces to the simulator

Twitter released a large data set of cache cluster traces which include
anonymized keys, entry sizes, and TTLs [1]. Their paper analyzes TTLs
which are under represented in papers as few traces are available. When
experimenting with adding support for TTLs, their sample traces had no
expiration events while their full traces were too large to run ad hoc.
Therefore that improvement was not made and we only evaluate with the
key and entry size.

A cursory analysis shows these caches have a recency-biased workload
with only a modest gain by policies that also leverage frequency. This
matches the paper's observations as well as prior from those working on
caches inside of social networks.

The entry-size aware policies were fixed to update the entry if the
size changes throughout the workload.

[1] https://github.com/twitter/cache-trace
/cc @1a1a11a @thinkingfish @ohadeytan

Coverage Stats

6228 of 6685 relevant lines covered (93.16%)

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ID	Job ID	Ran	Files	Coverage
2	2664.2 (TERM=dumb ORG_GRADLE_PROJECT_checksumFailOn=build_finish ORG_GRADLE_PROJECT_checksumPrint=true ORG_GRADLE_PROJECT_checksumIgnore=false GROUP=tests)	04 Nov 2020 07:28AM UTC	0	93.16	Travis Job 2664.2

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