Thanks for pointing out these tools. Larry Cohen
On Mon, Nov 16, 2015 at 5:06 PM, Tauzell, Dave <dave.tauz...@surescripts.com > wrote: > A monitoring tool like App Dynamics will give you lots of info but some > quicker tests you can do with built-in tools: > > - Check that the CPU on your server is not at 100% > - Use jstack to get a stack dump: > http://docs.oracle.com/javase/7/docs/technotes/tools/share/jstack.html . > I will take a couple stack traces with a few seconds in between each and > then see if all my threads are stuck somewhere. > - Use jstat (with the gcutil option) to print out Garbage Collection > issues: > https://docs.oracle.com/javase/8/docs/technotes/tools/unix/jstat.html . > Something to look for is lots of full GCs or really long GC times. > > The VisualVM tool can call the above utilities and show GC info in a > graphical manner. It might be easy to use depending on the network between > your app and where you run VisualVM. > > -Dave > > -----Original Message----- > From: Cohen, Laurence [mailto:lco...@novetta.com] > Sent: Monday, November 16, 2015 3:43 PM > To: Tomcat Users List > Subject: Tomcat Application Stops Responding > > Hi Everyone, > > Are there any tools that come with Java that I can use to troubleshoot an > intermittent problem we are having? The problem is that several times a > day, our Tomcat applications will stop responding and I'll have to restart > them to get them working again. It's gotten to the point where I have > written a script which does a wget every 10 minutes against an object in > the DB, and if it fails, it will restart our apps. I've also done some > statistics gathering and imported them into a spreadsheet so I can see what > is going on at the time the system is crashing. All I can see is that the > Tomcat connections are spiking. > > We are running Tomcat 7.0.59 with two apps, Postgres 9.2 on the backend > which is not administered by us, and httpd on the front end, 2.2.15. The > httpd server and app server are RHEL6. > > Thanks, > > Larry > This e-mail and any files transmitted with it are confidential, may > contain sensitive information, and are intended solely for the use of the > individual or entity to whom they are addressed. If you have received this > e-mail in error, please notify the sender by reply e-mail immediately and > destroy all copies of the e-mail and any attachments. > > --------------------------------------------------------------------- > To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org > For additional commands, e-mail: users-h...@tomcat.apache.org > > -- [image: www.novetta.com] Larry Cohen System Administrator 12021 Sunset Hills Road, Suite 400 Reston, VA 20190 Email lco...@novetta.com Office 703-885-1064
