Hi,
We have a Tomcat app that is loadbalanced by hardware. I have 4 boxes
available in our test env, all of which vary slightly but not massively in
spec.
Anyway I moved from 2 tomcat instances on each machine ( listening on
different ports ) down to 1 and I noticed for the same load the cpu
utilisation dropped by 20%. Interesting, how can this be explained? Is
this the extra effort in tomcat or something? Or is it memory related? the
2 instances had 1gb each, and the single one has been given 4gb. However I
have jprofiled the instance and it has never seemed memory hungry. Anyway I
suspect even at 2gb for 1 instance it would still be 20% less cpu - i can
always do a run to prove this if people think that necessary..
Another thing i've found is that on one server I have abnormally high CPU
utilisation for the same load. I've checked the logging levels are all the
same as are the java VM and the VM config settings. I wonder what else
could cause this? All i can think is some sort of OS or hardware
malfunction! maybe the CPU cache is duff or something.
Many thanks to any input to my Friday weird-ness!
Dan
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