since we're running the CPU at 100%, we don't think the problem is all page waits, although there have been some kernel messages from the Websphere machine in particular that memory allocations for Java processes (tasks?) are failing.
Check the max heap size for the JVM.
Conceptually, I understand what you're saying.
Implementation-wise, I have to ask: "How?"
Most disturbing have been a couple of episodes in which the Websphere guest just simply stops responding to terminal inputs. Our terminal sessions are via ssh, but these sessions seem to just hang. New connections time out, and logged in users can't kill running tasks and so forth. As I say, the Linux images are getting (taking) a fair amount of the CPU, so it's not that the whole Linux images are just dormant.
I've seen this happen in situations where the kernel gets hammered by very high volumes of memory allocation requests and goes off into la-la land during a swap operation. Also, what filesystem are you using? We discovered a rather nasty bug related to journaling in ReiserFS at very high traffic volumes a few days ago that was causing a lot of kernel overhead and occasionally sending things out into the void.
We're using ReiserFS for now on these systems.
What do your swap rate and vmstat output look like?
I'm not sure, in either case. The AIX guy says we're not swapping, but he may be referring to the Oracle instance.
Nick
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