[ https://issues.apache.org/jira/browse/HADOOP-10674?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14028743#comment-14028743 ]
Gopal V commented on HADOOP-10674: ---------------------------------- [~szetszwo]: Rajesh tested it on the same linux box. Not going to duplicate that. FYI, I hit cross-thread slowdowns when testing out HADOOP-9601. Might be worth writing a threadpool test (for HDFS daemons, not MR tasks). > 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)