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Tsz Wo Nicholas Sze commented on HADOOP-10674: ---------------------------------------------- In Java 7 and 8, the new code is faster than the existing code by 10% - 20% in most cases. However, it is still slower than java.util.zip.CRC32. [~rajesh.balamohan], thanks for check Java 7 and 8. You may want to try again with the new patch. [~gopalv], are you going to test the patch? > 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 > > > 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)