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Focal Point    Focal Point Forums  Hop To Forum Categories  WebFOCUS/FOCUS Forum on Focal Point     apache tomcat uses 2 GB of ram?

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apache tomcat uses 2 GB of ram?
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Jason K.
Master
posted
we've noticed that the tomcat service on our Windows 2003 server uses more and more RAM throughout the day. On a busier day (we've got all of about 8 users right now, most logon for a few minutes a day) we'll see the tomcat process shoot up to around 2 GB of RAM usage, on very very slow day, it stays around 200-400 MB of RAM usage.

Why does this happen? Is it bad coding on my part? does it happen to you folks as well?


Prod: Single Windows 2008 Server running Webfocus 7.7.03 Reporting server Web server IIS6/Tomcat, AS400 DB2 database.
 
Posts: 611 | Registered: January 04, 2007Report This Post
Sayed
Guru
posted Hide Post
Is WebFOCUS the only app running on Tomcat or are there other apps on that app server? Are you using Tomcat standalone or IIS/Tomcat?


WF 8.x and 7.7.x Win/UNIX/AS400, MRE/Portal/Self-Service, IIS/Tomcat, WebSphere, IWA, Realmdriver, Active Directory, Oracle, SQLServer, DB2, MySQL, JD Edwards, E-BIZ, SAP BW, R/3, ECC, ESSBASE
 
Posts: 285 | Location: Texas | Registered: June 27, 2006Report This Post
Jason K.
Master
posted Hide Post
webfocus is the only thing at all on that server, period.

it's an IIS/Tomcat configuration.


Prod: Single Windows 2008 Server running Webfocus 7.7.03 Reporting server Web server IIS6/Tomcat, AS400 DB2 database.
 
Posts: 611 | Registered: January 04, 2007Report This Post
susannah
Expert
posted Hide Post
What an interesting finding, Jason. Are you looking at TaskManager/processes? or some other way?



In Focus since 1979///7706m/5 ;wintel 2008/64;OAM security; Oracle db, ///MRE/BID
 
Posts: 3811 | Location: Manhattan | Registered: October 28, 2003Report This Post
Sayed
Guru
posted Hide Post
Hello Jason,

Is there a way of tracking history of Tomcat memory usage? or do you just have to look at the task manager when it is being used the most? I looked at my dev and prod test box and they are both <130MB.

Thanks,
Sayed


WF 8.x and 7.7.x Win/UNIX/AS400, MRE/Portal/Self-Service, IIS/Tomcat, WebSphere, IWA, Realmdriver, Active Directory, Oracle, SQLServer, DB2, MySQL, JD Edwards, E-BIZ, SAP BW, R/3, ECC, ESSBASE
 
Posts: 285 | Location: Texas | Registered: June 27, 2006Report This Post
hammo1j
Master
posted Hide Post
Sysinternals process explorer is good.

300M is showing as working set for Apache on production machine.

Is there not a limiter under Start - All Programs - Tomcat - Configure - Java Tab?


Server: WF 7.6.2 ( BID/Rcaster) Platform: W2003Server/IIS6/Tomcat/SQL Server repository Adapters: SQL Server 2000/Oracle 9.2
Desktop: Dev Studio 765/XP/Office 2003 Applications: IFS/Jobscope/Maximo
 
Posts: 888 | Location: Airstrip One | Registered: October 06, 2006Report This Post
Bryan Klimek
Member
posted Hide Post
We too have had memory issues in the JVM over the years. It first started in WebFocus 5.3 running on an NT system with WebSphere. We found that the JVM steadily increased it's memory footprint over a period of days. We always run our app servers with verbose garbage collection enabled. Using IBM's GCCollector tool it is very obvious that there is a memory leak in the WebFocus code. We worked with IBI at the time but got nowhere. We simply started to cycle the WebSphere app server once a day to recover the lost memory.

Fast forward to 2007. Now we run WebFocus 7.6 in a z/Linux environment with Tomcat. We again started to see the same exact issues with the memory. Again running verboseGC and using GCCollector we observed the memory leak. We notified IBI but never bothered to open an official case or push the issue. We simply setup crontab to cycle the tomcat server once a day.

In both of these cases (WebSphere and Tomcat) we run the JVM with a minimum heap size of 512Meg and a maximum of 1024Meg.

Bryan Klimek
Mayo Clinic
 
Posts: 18 | Registered: May 02, 2006Report This Post
Jason K.
Master
posted Hide Post
thanks for the ideas.
We are going to cycle our webfocus server each night to gather the wasted ram.

maybe they'll fix the next release.


Prod: Single Windows 2008 Server running Webfocus 7.7.03 Reporting server Web server IIS6/Tomcat, AS400 DB2 database.
 
Posts: 611 | Registered: January 04, 2007Report This Post
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