maybe your heap is too small and java is running many Full GC's.
Start java with -verbose:gc and look in tomcat/logs/catalina.out for Garbage Collections.
(set Environment Variables JAVA_OPTS or CATALINA_OPTS in bin/catalina.sh to do this in Tomcat)
================================
Try using a bigger Heapsize (though if you've got a Memory Leak that will only delay your problem)
or set initial Heapsize to same as maximum, for example 128MB:
-Xmx128m -Xms128m
================================
Modify the Connector you are using to access Tomcat (in tomcat/conf/server.xml) and
try using more Tomcat Processors (maxProcessors=XX) or a bigger accept queue length (acceptCount=XX)
(test value for acceptCount: at least > concurrent users x 3)
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Try using another method of garbage collection, if you're using JDK 1.4.1 i'd try either
ConcurrentGC with ParNewGC (ParNewGC on Multi-CPU machines): -XX:+UseConcMarkSweepGC -XX:+UseParNewGC
or ParallelGC with AdaptiveSizePolicy (saves you the work of Java Heap usage analyzing :-) :
-XX:UseParallelGC -XX:+UseAdaptiveSizePolicy
A good article on GC can be found here: http://wireless.java.sun.com/midp/articles/garbagecollection2/
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At 18:04 11.07.2003 +0000, you wrote:
With Tomcat 4.1.x
We've recently run into an issue where some of our pages either
a) take a really long time to come up (20+ seconds) or
b) come up, but never really finish loading (the status bar in IE shows the the
response hasn't finished).
These are very simple pages (for example, a login page) and our server load is
minimal (maybe 10 concurrent users). Then, mysteriously, the problem will go
away by itself. It will also return.
Given the information above, I'm not expecting any solutions, but I could use some help steering me in the right direction with things to check. We're hooking up monitoring on the systems (Linux) to examine memory and CPU utilization during the slowdowns.
Any things in particular we should be examining to try to find the problem? Any idea why the pages would never fully return from the server?
TIA
-- Dave
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