> From: Steve G.B. [mailto:[EMAIL PROTECTED]
> I've created a VM with 4 VCores, and all of the cores are
> allocated to the VM.
OK, so 50% CPU = 2 cores maxed out. Out of interest, is it 25% with only one
Tomcat started?
> I'm using Sun JVM 1.6, and stressing the Guest with
> Loadrunner on another
> machine (if you ask: this machine with loadrunner isn't the
> bottleneck)
>
> No Databases, no I/O requests, no Network saturation.
OK.
Given that you're getting exactly 50% CPU use (it *is* exact, right?) that
indicates the test harness is very unlikely to be the problem. It would almost
certainly bottleneck at some other CPU value.
> that's why I think it's the JVM.
> For my tests I used the standard demo webapp in Loarunner
> (Mercury Tours),
> and a couple of stupid jsp pages. So Apache and Tomcat both.
I'll highlight that to the folks who know the demo app better: does it run
properly under load? I'd assume so...
> Fun thing is that when using Tomcat and Apache combined, I
> can get an 80-85% CPU Utilization.
Yes. If you've got httpd passing everything through it as well, you'll
increase the CPU load - that's expected!
> Problem is that for my tests I need
> something more simple and the same server.
Yes. Why add complexity when it's not required? :-)
> How do you saturate an 8-core host?
With some reasonably complex code in the JSPs :-). Out of interest, if your
JSPs call something that loops a couple of million times before returning, what
happens to the CPU use?
- Peter
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