I have found 2 ways in which the Java Out-of-Memory Exception can be solved:
1.) On linux machines, we can start tomcat as a unix daemon as pointed out in this tutorial <http://tomcat.apache.org/tomcat-6.0-doc/setup.html>. Tomcat gets more priority, memory and can run more efficiently. Infact, it also helps performance by benchmarking and as pointed here: http://oreilly.com/catalog/9780596101060/chapter/ch04.pdf 2.) On Windows machines, the JRE runs with the Client JVM which is optimized for quick start, but not for better memory/thread management as the server HotSpot VM. We should by default start tomcat with server VM. In my JavaEE experience, this does reduce a lot of OOM exceptions. If you just have the JRE installed then the server vm is not installed. You need the JDK and have to pass the -server parameter when starting tomcat. If you have the JRE only, then you can copy the server folder from a JDK installation, just like I am doing in the new installer for Windows. --- Regards, Saptarshi PURKAYASTHA Director R & D, HISP India Health Information Systems Programme My Tech Blog: http://sunnytalkstech.blogspot.com You Live by CHOICE, Not by CHANCE 2009/3/20 Orvalho Joaquim Augusto <orvaq...@gmail.com> > We need more info. > > Logs form postgres and tomcat. > Configuration files for tomcat. > Physical resources of you machine (RAM and CPU) > Operating System and FileSystem > > From my experience this is issued much probably by JVM/Tomcat. > > I am not sure... but it seems that someone have discussed this here before. > > Caveman > > > Thuy Nguyen wrote: > >> Dear all, >> >> We HISP Vietnam team meet a problem and need solution to solve. Currently >> DHIS2 of HISP Vietnam using report module to generate reports which created >> by BIRT report designer. On the March 19th, 2009 there was a training class >> for users to practice entering data and generating reports. The class >> includes 40 users work at same time in the program. >> Entering data values was fine. But when there are many users generate >> reports at the same time. The system suddenly become very slow and every >> user get the OutOfMemorry java exception when click in any button of the >> program. That time Tri has to restart the tomcat of server, the sistuation >> become better for 2 minutes, and the problem appear again when few users >> generate reports. This even affect to another users who doesn't generate >> report but entering data in the class that time. >> Tri has checked in database, there were many many transactions opened but >> weren't closed. >> After meeting to find the reason, we don't know about other reason except >> reports were designed by BIRT. May be we were wrong. We are looking forward >> your suggestions and consult to find out the right reason and solutions to >> solve. May be change another tool instead of BIRT, or correct the program or >> someway else. Dr. Trung requested us have to find the right solution before >> April. >> Please help us... >> >> >> >> -- >> -- >> Thuy >> HISP Vietnam >> +84902079126 >> xuan_thuy...@yahoo.com <mailto:xuan_thuy...@yahoo.com> >> thuy.hispviet...@gmail.com <mailto:thuy.hispviet...@gmail.com> >> > > > > _______________________________________________ > Mailing list: https://launchpad.net/~dhis2-devs > Post to : dhis2-devs@lists.launchpad.net > Unsubscribe : https://launchpad.net/~dhis2-devs > More help : https://help.launchpad.net/ListHelp >
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