Degraded performance Customers may experience issues using Community search. Our team is investigating.
We've just bought and installed JIRA 5.0.3 & Greenhopper 5.10.1. The server is installed on an Amazon EC2 server ("m1.large", Amazon Linux 64bit, 7.5GB memory, 2 cores), connected to an Amazon RDS instance (db.m1.small, 5GB storage). The system is connected to our internal Active Directory system for authentication. The application server has the Tempo Time tracking plugin (v184.108.40.206) installed. There are no other applications running on this server.
Our problem is the server is pegging the CPU at 100% usage, all the time, with only 1 or 2 users logged in. As such screen updates are taking 20-30 seconds to display, even with 1 or 2 users. We've modified the memory params to the settings below.
Can anyone give me some pointers on how to begin troubleshooting where the CPU load is coming from?
Thanks in advance,
-Djava.util.logging.config.file=/opt/apps/jira/conf/logging.properties -XX:MaxPermSize=512m -Xms4096M -Xmx4096M -Djava.awt.headless=true -Datlassian.standalone=JIRA -Dorg.apache.jasper.runtime.BodyContentImpl.LIMIT_BUFFER=true -Dmail.mime.decodeparameters=true -XX:+PrintGCDateStamps -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Djava.endorsed.dirs=/opt/apps/jira/endorsed -Dcatalina.base=/opt/apps/jira -Dcatalina.home=/opt/apps/jira -Djava.io.tmpdir=/opt/apps/jira/temp
I found the problem.
The server JIRA/Greenhopper ran in was an Amazon m1.large instance (2 CPU's, 7.5GB memory). Monitoring the server the CPU was showing 100% usage. Closer inspection showed the CPU 'Steal Time' was > 97%. This parameter is apparently used in Virtual Machines - Amazon use it to slow down/claim back excessive resource usage in an attempt to ensure equal performance to all instances running on their hardware. Switching the machine to a more 'Compute-friendly' 'c1.medium' VM has eliminated the 'Steal Time' usage.
http://gregsramblings.com/2011/02/07/amazon-ec2-micro-instance-cpu-steal/ explains 'CPU Steal time' better than I can.
Was this taken while 100% CPU usage?
If yes, the problem most probably is with:
1. The LDAP connection thread
2. The acceptor thread (hard to believe)
To be sure, do the following while having 100% usage:
a. Start top utility
b. Once started, press Shift-H (upper H). It will show you the threads consuming the most CPU.
c. Note down the pid (the tid) of the thread, usually first column
d)Dump again the threads.
e) Post again the TID and the thread dump
This community is celebrating its one-year anniversary and Atlassian co-founder Mike Cannon-Brookes has all the feels.Read more
Hey Atlassian Community! Today we are launching a bunch of customer stories about the amazing work teams, like Dropbox and Twilio, are doing with Jira. You can check out the stories here. The thi...
Connect with like-minded Atlassian users at free events near you!Find a group
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no AUG chapters near you at the moment.Start an AUG
You're one step closer to meeting fellow Atlassian users at your local meet up. Learn more about AUGs