The task manager shows what memory has not been allocated to any programs by Windows, it cannot see within a program to know what memory is actually being used. With that in mind, remember that, at least to Windows, the JVM is just a program. The JVM has it's own memory management system that allocates and garbage collects memory as it's needed by the Java application that is running. When the Java application requests allocations that exceed the current memory space that the JVM has received from Windows, the JVM will ask Windows for more memory. Now here's the part that answers your question, the JVM will never give that memory back to Windows until it's job is done and the JVM exits. So what you see in the Task Manager is the maximum amount of space allocated to the JVM, not the amount of space your Java application is using. (*Chris*)
----- Original Message ----- From: "Yedil Workeneh" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Wednesday, October 16, 2002 5:59 AM Subject: [SERVLET-INTEREST] debug Servlet > Is there a way to identify what a runaway thread is doing? > > After starting up tomcat, I put my application under heavy load for 15-20 > minutes. I bring up the task manager and make sure the CPU usage is ~99 and > I exercise the memory up to 140M. I check the access logs for the last > request and wait for the memory to get reclaimed...it doesn't...I have > finalize calls in my code.... I've waited hours after I get Tomcat in this > state and there is no return to normalcy... > > I get the same result using Tomcat 4.0.3 or 4.0.6.... > > I guess there are tools that track threads and let you know if a thread is > running amuck, but is there a way to tell what it is doing?... > > ___________________________________________________________________________ > To unsubscribe, send email to [EMAIL PROTECTED] and include in the body > of the message "signoff SERVLET-INTEREST". > > Archives: http://archives.java.sun.com/archives/servlet-interest.html > Resources: http://java.sun.com/products/servlet/external-resources.html > LISTSERV Help: http://www.lsoft.com/manuals/user/user.html > > ___________________________________________________________________________ To unsubscribe, send email to [EMAIL PROTECTED] and include in the body of the message "signoff SERVLET-INTEREST". Archives: http://archives.java.sun.com/archives/servlet-interest.html Resources: http://java.sun.com/products/servlet/external-resources.html LISTSERV Help: http://www.lsoft.com/manuals/user/user.html
