I can almost bet I heard somewhere (possibly Remedy Support), a few versions ago (I think during V5 days), that allocating about 4 MB per expected concurrent web user is a fair algorithm to arrive at the expected web server memory usage. I can't see how that might have changed significantly since V5. To be on the safe side I would add another 25% to that figure.
Joe D'Souza -----Original Message----- From: Action Request System discussion list(ARSList) [mailto:[EMAIL PROTECTED] Behalf Of Kemes, Lisa Sent: Wednesday, October 03, 2007 12:16 PM To: [email protected] Subject: Re: Tomcat Using Full CPU on Win2003 ** I created a ticket with BMC and they looked at the logs and said that we needed to increase our Java Heap size to 1GB. We have a Windows 2003 Mid Tier server with 2GB of RAM (7.0.1 Patch 3) and there are other apps on this server, so 1GB seemed a little excessive, so I asked "Is there a formula to figure what size the Java Heap should be?" They replied: There is no formula for calculating the heap size. The default heap size on Tomcat is 64mb.Our recommendation to increase the heap size is based on the error we're seeing in the Tomcat log. For large applications such as ITSM 6 we recommend a heap size of 512mb and for larger applications such as ITSM 7, we recommend 1G. Well, we don't have ITSM 6 or 7, just AR System and Mid Tier. We've increased to 128MB so far. But my question is, does anyone have a formula or an idea of what the heap size should be? Also, does anyone have their Tomcat performance or logs monitored to notify when it's over the heap size (when the log says: Java.lang.OutOfMemory: Java Heap Space)? Lisa ---------------------------------------------------------------------------- -- From: Action Request System discussion list(ARSList) [mailto:[EMAIL PROTECTED] On Behalf Of Averell, Graham Sent: Wednesday, September 26, 2007 4:23 AM To: [email protected] Subject: Re: Tomcat Using Full CPU on Win2003 ** Hi Lisa, Have you tried manually deleting the tomcat cache? Move or delete the Catalina dir (fine it in \Tomcat 5.5\work\ dir). It will rebuild after restarting the tomcat service. Also watch the cpu usage after stopping the tomcat service. Wait till it drops before manually restarting the service. Graham ---------------------------------------------------------------------------- -- From: Action Request System discussion list(ARSList) [mailto:[EMAIL PROTECTED] On Behalf Of Kemes, Lisa Sent: 25 September 2007 19:52 To: [email protected] Subject: Re: Tomcat Using Full CPU on Win2003 I tried to find this .dll and did not find it. So I'm thinking that this may not be the problem. Thanks! ---------------------------------------------------------------------------- -- From: Action Request System discussion list(ARSList) [mailto:[EMAIL PROTECTED] On Behalf Of Tony Worthington Sent: Tuesday, September 25, 2007 11:53 AM To: [email protected] Subject: Re: Tomcat Using Full CPU on Win2003 ** Lisa - Are you using the tcnative.dll? It would be in Tomcat\bin -- tcnative-1.dll or tcnative.dll I found that deleting/renaming the file fixed my 100% cpu issues. I also use mod_jk which I think plays into the problem. http://archive.netbsd.se/?ml=tomcat-dev&a=2006-11&t=2659074 If that's not the issue maybe someone else can give you further insight... -tony -- Tony Worthington Sr. Technical Analyst Kohl's Department Stores [EMAIL PROTECTED] 262-703-5911 "Kemes, Lisa" <[EMAIL PROTECTED]> Sent by: "Action Request System discussion list(ARSList)" <[email protected]> 09/25/2007 10:20 AM Please respond to [email protected] To [email protected] cc Subject Tomcat Using Full CPU on Win2003 ** We have production ARS 7.0.1 Mid-Tier Server down due to the tomcat process taking a full CPU (spinning). Stopped/restarted the service and can get in ... Mid Tier Logs: Sep 25, 2007 10:34:25 AM - WARNING (com.remedy.log.INTERNAL) : (Thread 12) The JSWRiter parameter is not set to mutiline mode. Performance might get affected due to this. Not sure how to avoid this in the future? Lisa Kemes BMC Remedy Developer Tyco Electronics 717-810-2408 tel 717-810-2124 fax [EMAIL PROTECTED] No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.488 / Virus Database: 269.14.0/1046 - Release Date: 10/3/2007 10:08 AM _______________________________________________________________________________ UNSUBSCRIBE or access ARSlist Archives at www.arslist.org ARSlist:"Where the Answers Are"
