Re: [Xen-users] Re: Xen Scheduler: Credit Scheduler ?

[Emmanuel Ackaouy <ack@xxxxxxxxxxxxx>]

On Fri, Nov 24, 2006 at 08:23:54AM +0100, Ulrich Windl wrote:
> > I threw around some ideas to get more data points and help
> > debug this:
> > - run spinners on the guest that consume CPU
> >     "int main() { while (1); return 0; }" and run X copies (for X vcpus)
> > - take scheduler traces (man xentrace)
> 
> A bad example, because that will either be optimized that it will execute in 
> CPU's 
> L1 cache, thus causing about no load at all (assuming a SMP system).
> 
> What about "find /usr -type f | xargs cat | gzip >/dev/null" instead. If you 
> have 
> plenty of room output to some real file. That's some load.

Why would you want to generate cache misses or file system I/O in
this case? We just want to keep a domain artificially runnable
to verify that Xen schedules its VCPUs appropriately. An infinite
loop does just that.

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