I'm trying to track down a slowing/timeout problem on one of our CF servers
(MS/IIS machines) and I've noticed something strange.
Using the performance monitor on all 3 of our webservers shows a "spike" in
CPU resources. It looks like a heartbeat - every 20 sec or so (lasts less
than a second). The biggest spike is on the problem machine (97% - the
others are lower). We've worked it back to JRun.
High CPU utilisation is not necessarily a bad thing. Throughput is really what you should be worried about. Clearly it is a good thing that when work needs to be done the CPU is utilised. However, that said, sustained CPU load is often indicative of not-so-good things.
JRUN spikes when it is compiling CF code and when it is doing garbage collection. And of course it spikes when it has high traffic and work to do.
Did you say this is happening on only one of three identical servers? What are your JVM settings for the servers? Are you seeing slowdowns during peak traffic or just "for no apparent reason"? Are these slow downs only related to the MS Access database environment you mentioned earlier?
-- geoff http://www.daemon.com.au/
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