RE: Memory usage problem
From: Christoph Sperle [mailto:[EMAIL PROTECTED] Subject: Memory usage problem As you can see, tomcat uses 138m, even though, it was start up with 64m restriction (-Xmx64m). You're confusing heap size (-Xmx) with total process space. The total process space includes many other things besides the JVM heap, such as code banks, stacks, internal JVM structures, OS-related structures, etc. Even so, 138M is pretty tiny, these days. - Chuck THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY MATERIAL and is thus for use only by the intended recipient. If you received this in error, please contact the sender and delete the e-mail and its attachments from all computers. - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Memory usage problem
Hello all I run tomcat on a virtual private server with very limited resources. Therefore I want tomcat to run with very restrictive memory usage. I tried hard to get this done, but with no success. Tomcat uses as much memory as it wants to use, regardless of the specified startup settings. OS: Ubuntu Server 6.10 Tomcat: 5.0.30 'ps': tomcat5 26107 0.7 3.5 341488 141492 ? Sl 08:18 3:01 /usr/lib/j2sdk1.5-sun/bin/java -Djava.awt.headless=true -server -Xms48m -Xmx64m ... 'top': 26107 tomcat5 17 0 333m 138m 16m S0 3.5 3:02.97 java As you can see, tomcat uses 138m, even though, it was start up with 64m restriction (-Xmx64m). What's wrong here? Kind regards Christoph Sperle - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Memory usage problem
Thank you Chuck, you are right. But for me, that remains a big problem (and I read about it many times in VPS forums too): How to restrict the process size of tomcat? If I stop tomcat and measure the free memory (on a VPS that's not easy at all, see http://www.webhostingtalk.com/showpost.php?p=4851698postcount=6): Used memory = 86m After I started tomcat (with my single webapp and heap restricted to 64m): Used memory = 365m That's 280m - more as four times of the heap size restriction! I never saw this behavior at any other java program. Do you have a hint to restrict/reduce the overall process memory tomcat uses. Thanks Christoph -Original Message- From: Caldarale, Charles R [mailto:[EMAIL PROTECTED] Sent: Mittwoch, 19. Dezember 2007 15:42 To: Tomcat Users List Subject: RE: Memory usage problem From: Christoph Sperle [mailto:[EMAIL PROTECTED] Subject: Memory usage problem As you can see, tomcat uses 138m, even though, it was start up with 64m restriction (-Xmx64m). You're confusing heap size (-Xmx) with total process space. The total process space includes many other things besides the JVM heap, such as code banks, stacks, internal JVM structures, OS-related structures, etc. Even so, 138M is pretty tiny, these days. - Chuck THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY MATERIAL and is thus for use only by the intended recipient. If you received this in error, please contact the sender and delete the e-mail and its attachments from all computers. - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Memory usage problem
From: Christoph Sperle [mailto:[EMAIL PROTECTED] Subject: RE: Memory usage problem Do you have a hint to restrict/reduce the overall process memory tomcat uses. 1) Eliminate unnecessary items in server.xml (e.g., unused connectors). 2) Reduce the number of threads configured for each connector. 3) Don't deploy any unnecessary webapps (eats up file descriptors). 4) Package webapp classes into as few jars as possible (more file descriptors). 5) Insure the applications aren't opening files or starting auxiliary threads unnecessarily. Don't know how much any of the above will help, since the impact is very dependent on the particular OS you're using and how efficient it is at conserving resources. - Chuck THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY MATERIAL and is thus for use only by the intended recipient. If you received this in error, please contact the sender and delete the e-mail and its attachments from all computers. - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
