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Benedict edited comment on CASSANDRA-8614 at 2/9/15 8:39 PM: ------------------------------------------------------------- I meant I was planning to do all of my commits post then, not that I would commit this to the 2.1 branch. But glad we got it cleared up in case I did without thinking too much about it. was (Author: benedict): I meant I was planning to do all of my commits post then, not that I would commit this to the 2.1 branch. > Select optimal CRC32 implementation at runtime > ---------------------------------------------- > > Key: CASSANDRA-8614 > URL: https://issues.apache.org/jira/browse/CASSANDRA-8614 > Project: Cassandra > Issue Type: Improvement > Components: Core > Reporter: Ariel Weisberg > Assignee: Ariel Weisberg > Labels: performance > Attachments: 8614.patch, Sample.java > > > JDK 8 has support for an intrinsic for CRC32 that runs at 12-13 gigabytes/sec > per core in my quick and dirty test. PureJavaCRC32 is < 800 megabytes/sec if > I recall and it has a lookup table that evicts random cache lines every time > it runs. > In order to capture the benefit of that when it is available we can select a > CRC32 implementation at startup in a static block. > If JDK 8 is not what is running we can fall back to the existing > PureJavaCRC32 implementation. -- This message was sent by Atlassian JIRA (v6.3.4#6332)