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Tsz Wo Nicholas Sze updated HADOOP-10674: ----------------------------------------- Attachment: c10674_20140612.patch c10674_20140612.patch: adds multi-threaded tests. > Rewrite the PureJavaCrc32 loop for performance improvement > ---------------------------------------------------------- > > Key: HADOOP-10674 > URL: https://issues.apache.org/jira/browse/HADOOP-10674 > Project: Hadoop Common > Issue Type: Improvement > Components: performance, util > Reporter: Tsz Wo Nicholas Sze > Assignee: Tsz Wo Nicholas Sze > Attachments: c10674_20140609.patch, c10674_20140609b.patch, > c10674_20140610.patch, c10674_20140612.patch > > > Below are some performance improvement opportunities performance improvement > in PureJavaCrc32. > - eliminate "off += 8; len -= 8;" > - replace T8_x_start with hard coded constants > - eliminate c0 - c7 local variables > In my machine, there are 30% to 50% improvement for most of the cases. -- This message was sent by Atlassian JIRA (v6.2#6252)