CPU Spike Every 10 seconds

Google

Mailing List

Home

Forum Home

JBoss - Java Application Server

Tomcat - JSP/Servlet container

Struts - A MVC web framework

iText - An open source PDF Java Library

JDOM - JDOM XML Parser

J2EE - A mailing list for Java(tm) 2 Platform, Enterprise Edition

JSP - A mailing list about Java Server Pages specification and reference

J2EE Pattern - An interest list for Sun Java Center J2EE Pattern Catalog

Servlet - A mailing list for discussion about Sun Microsystem's Java Servlet API Technology

Struts & Hibernate

Subjects

•	JSP editor plugin for eclipse ?
•	org apache jasper JasperException: Unable to compile class for JSP
•	Tomcat: Connection reset by peer: socket write error
•	Cannot retrieve definition for form bean null
•	Struts Tiles Tutorial (free Struts training)
•	Where do I download Tomcat 4 0 6?
•	Data Access Object (DAO) pattern, example DAO 's
•	Where to download Tomcat v 4 1 24 from?
•	Tomcat 5 0 16 Requested resource not available
•	Oracle Connection Pooling in 3 2 2
•	Servlet : Session invalidate
•	Servlet action is currently unavailable
•	Tomcat/Struts Unicode Encoding/Decoding problems
•	Tomcat and webapplication specific java library path
•	Running a Simple JMS Example
•	Mapping in workers2 properties
•	org apache jasper JasperException
•	Cannot find message resources under key org apache struts action MESSAGE
•	problem with html:text bean throwing exception
•	Cannot find message resources under key org apache struts action MESSAGE
•	invalid direct reference problem with solution
•	Tool for jsp debug Try Sysdeo Eclipse Plugin
•	Tomcat 5 Cannot load JDBC driver class 'null ' SQL state: null
•	weblogic ejbc
•	java properties file
•	Jboss 3 2 3 Coyote Can 't re
•	Tomcat 5, Apache2 and mod jk2 integration problem
•	JBoss example problem new to J2EE
•	url string for connecting jboss to oracle
•	Value attribute of <html:checkbox
•	javax servlet ServletException: BeanUtils populate
•	HTTP Status 404 The requested resource is not available
•	5 0 18: Windows XP Pro vs Windows 2000

CPU Spike Every 10 seconds

CPU Spike Every 10 seconds

2007-01-10 - By Ashraf Mohamed

Back

Reply: 1 2

Hi,

We are running Tomcat 5.5.9 on Windows 2000 Server. Our test involves
500 plus clients sending periodic jsp requests.

Performance logs show that the tomcat process spikes up to 50% every 10
seconds even AFTER the test has ended and the clients have stopped
sending requests.

Tomcat logs showed the following two statements:

Every 10 seconds:

16:59:46,599 DEBUG (HostConfig.java:960)
[org.apache.catalina.startup.HostConfig::checkResources] - Checking
context[/TUP] redeploy resource D:\Program Files\Tomcat\webapps\TUP

Every 60 seconds:

2007-01-09 16:59:36,532 DEBUG (ManagerBase.java:653)
[org.apache.catalina.session.ManagerBase::processExpires] - Start expire
sessions StandardManager at 1168383576532 sessioncount 0
2007-01-09 16:59:36,563 DEBUG (ManagerBase.java:662)
[org.apache.catalina.session.ManagerBase::processExpires] - End expire
sessions StandardManager processingTime 31 expired sessions: 02007-01-09

I tried turning off autoDeploy. The redeploy log messages went away, but
the cpu remains the same.

I turned on verbose:gc and the GC logs show collection every 90 seconds
or so. So that does not match the cpu spike.

What does Tomcat do that could cause a cpu spike of almost exactly 50%
almost exactly every 10 seconds?

I have spent a couple of days searching the web, tomcat lists and bug
lists without any luck. Appreciate any help anyone can provide. Thanks.

Ash

-- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ------
To start a new topic, e-mail: users@(protected)
To unsubscribe, e-mail: users-unsubscribe@(protected)
For additional commands, e-mail: users-help@(protected)