> >As Qemu cannot use multicore CPUs (partially due to missing thread > >safety), yet, you won't benefit from this unless you want to run > >multiple instances of Qemu in parallel. > > how close is thread safey?
In a useful form: a fair way off. It's relatively simple to hack something together than runs. Making it work correctly and go fast is much harder though. My current prototype (running on 2 cores) runs about a quarter the speed of normal qemu, and dies shortly after booting because the guest atomic synchronisation primitives don't work right. Either way, for a tinderbox or automated testing yo *do* have lots of different tests you can run in parallel, so it doesn't matter that each qemu instance only uses one core. We're only talking about small SMP here - maybe 16 cores, but not thousands. Paul