http://www.wired.com/wiredenterprise/2012/07/leap-second-bug-wreaks-havoc-with-java-linux/
2012/7/2 [email protected] <[email protected]> > Yes I guess we will see plenty of complains in the internet about this Bug > in the upcoming days. > A nice Monday morning suprise :)) > > > Sebastian > > 2012/7/2 bob lin <[email protected]> > >> On 07/02/2012 04:20 PM, [email protected] wrote: >> >> Hi Bob, >> >> I found out the root source ARGGG >> >> It seems like a Bug in the JAVA JVM, >> see this Blog post, it fixed my issues: >> >> http://blog.wpkg.org/2012/07/01/java-leap-second-bug-30-june-1-july-2012-fix/ >> >> I did not turn on ntp anymore. >> >> Sebastian >> >> 2012/7/2 [email protected] <[email protected]> >> >>> Hi Bob, >>> >>> I don't know yet. The issue is not resolved yet on our server. >>> I will post something to this mailing list as soon as I have found out >>> how we were able to solve our issues. Maybe it will help you too. >>> >>> I think it has something todo with the Java JVM installation/settings. >>> You could try out downloading another JVM from the java.com. A Java JVM >>> installation is actually an unpacked ZIP file so you can run >>> $JAVA_HOME/bin/java DoJavaTest with any Java runtime that you download and >>> "install". >>> >>> Sebastian >>> >>> >>> 2012/7/2 bob lin <[email protected]> >>> >>>> On 07/02/2012 03:17 PM, [email protected] wrote: >>>> >>>> Hi Bob, >>>> >>>> I recently saw something similar on a server ... >>>> >>>> You should check if there is an issue with Java in general. >>>> I don't think that its an OpenMeetings related problem. >>>> >>>> You could try for example this simple Java Test: >>>> http://pastebin.com/DmhcAuVE >>>> >>>> It should print a Date/Time every 0,5 seconds. >>>> I've attached a compiled version of the programm. >>>> You can run it using: java DoJavaTest >>>> >>>> I guess you will see that even with such simple programm your CPU is at >>>> 100%. >>>> >>>> >>>> Sebastian >>>> >>>> >>>> 2012/7/1 bob lin <[email protected]> >>>> >>>>> Dear Developers: >>>>> First, thanks for developing such a excellent software. It works fine , >>>>> but the cpu load on server side is abnormally high . >>>>> >>>>> Phenomena : >>>>> The Openmeetings works fine on every aspect. But on the server side( a >>>>> 16 core system ) , the java process takes 1000% ~ 1100% CPU time, and >>>>> about 10~15 kernel irq request ( [ksoftirqd/3] for example ) each takes >>>>> 30% , the total load of CPU reachs 2200% . Whether the user is logged >>>>> in >>>>> or not doesn't change the situation. >>>>> >>>>> System Info : >>>>> The openmeetings version is 1_9_1_r4707, The jre version is >>>>> jre1.6.0_33/jre1.7.0_5 . I use libreoffice 3.5 . The system is CentOS >>>>> 6.2 x86_64 with MySQL Ver 14.14 Distrib 5.1.61. >>>>> >>>>> I follow the configuration instructions on >>>>> https://code.google.com/p/openmeetings/wiki/InstallationCentOS5 >>>>> But with some newer version software (Imagemagick, ffmpeg) >>>>> >>>> >>>> >>>> >>>> -- >>>> Sebastian Wagner >>>> https://twitter.com/#!/dead_lock >>>> http://www.openmeetings.de >>>> http://www.webbase-design.de >>>> http://www.wagner-sebastian.com >>>> [email protected] >>>> >>>> >>>> Yeah , The sample program doesn't even update the time , and CPU is >>>> 200%!! , In a single CPU test environment the java environment just >>>> functioning normally , Thanks for your advice , and is there any solutions >>>> you may advice? >>>> >>>> >>> >>> >>> -- >>> Sebastian Wagner >>> https://twitter.com/#!/dead_lock >>> http://www.openmeetings.de >>> http://www.webbase-design.de >>> http://www.wagner-sebastian.com >>> [email protected] >>> >> >> >> >> -- >> Sebastian Wagner >> https://twitter.com/#!/dead_lock >> http://www.openmeetings.de >> http://www.webbase-design.de >> http://www.wagner-sebastian.com >> [email protected] >> >> >> It works ! Thanks ! >> >> Very interesting . Now it seems that the jre is comfused by 23:59:60 , >> and require hardware clock time endlessly , >> Thus can explain the high load of both the java process and the kernel >> irq . >> >> > > > -- > Sebastian Wagner > https://twitter.com/#!/dead_lock > http://www.openmeetings.de > http://www.webbase-design.de > http://www.wagner-sebastian.com > [email protected] > -- Sebastian Wagner https://twitter.com/#!/dead_lock http://www.openmeetings.de http://www.webbase-design.de http://www.wagner-sebastian.com [email protected]
