I am running the test on 0.18.1 and 0.19.1. Both versions have the same issue with JRockit JVM. It is for the example sort job, to sort 20G data on 1+2 nodes.
Following is the result(version 0.18.1). The sort job running with JRockit JVM took 260 secs more than that with Sun JVM. ----------------------------------------------- || JVM || Completion Time || ----------------------------------------------- || JRockit || 786,315 msec || || Sun || 526,602 msec || ----------------------------------------------- Furthermore, under 0.19.1 version, I have set the reusing JVM parameter as -1. It seems no improvement for JRockit JVM. On Thu, May 7, 2009 at 4:32 PM, JQ Hadoop <jq.had...@gmail.com> wrote: > I believe Jrockit JVM have slightly higer startup time than the SUN JVM; > but > that should not make a lot of difference, especially if JVMs are reused in > 0.19. > > Which Hadoop version are you using? What Hadoop job are you running? And > what performance do you get? > > Thanks, > JQ > > -----Original Message----- > From: Grace > Sent: Wednesday, May 06, 2009 1:07 PM > To: core-user@hadoop.apache.org > Subject: Is there any performance issue with Jrockit JVM for Hadoop > > Hi all, > This is Grace. > I am replacing Sun JVM with Jrockit JVM for Hadoop. Also I keep all the > same > Java options and configuration as Sun JVM. However it is very strange that > the performance using Jrockit JVM is poorer than the one using Sun, such as > the map stage became slower. > Has anyone encountered the similar problem? Could you please give some > advise about it? Thanks a lot. > > Regards, > Grace >
