Thanks. StringBuilder seems to be the most popular suggestion! I'm going to implement this and report on any changes I see in Tomcat's behavior. I'm also looking at other possiblities, such as Tomcat's I/O activities causing thrashing if I/O is excessive. Would anybody know how I could monitor Tomcat's I/O activities? Also, is there a way to configure Tomcat so that a connection times out after a certain period of time? Thanks to everyone for your attention and help.
Bob -----Original Message----- From: Kev Jackson [mailto:[EMAIL PROTECTED] Sent: Wednesday, November 07, 2007 11:14 PM To: Tomcat Users List Subject: Re: [OT] Tomcat causing high CPU load Hi, From a programmatic point of view > Many thanks for all the suggestions. I found a simple tool called StackTrace > from http://www.adaptj.com/root/main/tracehowtos#ht0 to help me take thread > dumps from Tomcat. I found when the CPU load was high that there was a thread > from the suspect web app running. In contrast, thread dumps taken when CPU > load was normal showed no such threads. The line that the web app thread was > running at is a simple - data += "\n"; - this is in a loop collecting form > data from hidden vars created by JavaScript code. It's been suggested by ny > colleagues that the JVM could be running out of memory since a new String > object is created for each +=. The String data ends up being very long > anyway. Any thoughts on this would be appreciated. > Also, would anyone know how to monitor Tomcat's I/O activities? I understand > that thrashing could be a drain on memory resources. > Thanks again for everybody's help! You could replace the data += "\n" code with a StringBuilder (Java6) or a StringBuffer - this would reduce the number of intermediate objects being created quite significantly Kev --------------------------------------------------------------------- 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]
