Theine 0.3.3 released, introducing new Clock-Pro eviction policy

• theine

  8 283 6.4 Python

  high performance in-memory cache

• LIRS2

  2 3 10.0 C++

  LIRS2 source code & miss ratio curves of 115 traces

The main benefit of ClockPro is that it is trivially concurrent for reads, but it could suffer from slow evictions due to O(n) scans. The author's most recent work is LIRS2 which appears to be very competitive except in adaptive stress tests. Unfortunately their ideas never got widely adopted likely due to the algorithms not being very intuitive, hard to write and debug, and not originally having good reference implementations.

• InfluxDB

  www.influxdata.com featured

  Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.

  

• Caffeine

  43 15,227 9.7 Java

  A high performance caching library for Java

Pebble's author wanted the simpler approach for concurrency and the implementation significantly differs from the paper. An attempt to clean up and improve it was done in the Java simulator, but the corrected version held the write lock longer as it scans more. I think adding thresholds is a good idea for a real implementation like yours.

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