I was under the impression that virtual CPUs in the UML are there for testing purposes, and that the process for any given UML (no matter how many virtual CPUs it had) ran on only one physical CPU.
On Thursday 03 November 2005 03:36 pm, Ian Smith-Heisters wrote: > I still don't know how that option works. If they're virtual cpus, do > they map to real cpus? Is this option what's required for UML instances > to use both CPUs? All I know is the switch is there, I've no idea how it > works, and I'd be interested to know. > > -Ian > > Alexander Charbonnet wrote: > > I suppose my information is way out of date, then. Sorry! > > > > On Thursday 03 November 2005 02:59 pm, Ian Smith-Heisters wrote: > >>There is > >> > >>ncpus=<# of desired CPUs> > >> This tells an SMP kernel how many virtual processors to start. > >> > >>in vmlinux --help > >> > >>Alexander Charbonnet wrote: > >>>>Actually, I use UML on one server in my firm. I want to migrate my > >>>> server on a new machine which have 2 processors. Is UML can use all > >>>> processors ? My kernel version is 2.6.12.2 with skas mode on host. > >>> > >>>My understanding is that each UML instance will see only one processor. > >>>You can run twice as many UMLs on a machine (at least as far as CPU > >>>time), but each machine only gets one CPU. > >>> > >>> > >>> > >>>------------------------------------------------------- > >>>SF.Net email is sponsored by: > >>>Tame your development challenges with Apache's Geronimo App Server. > >>>Download it for free - -and be entered to win a 42" plasma tv or your > >>>very own Sony(tm)PSP. Click here to play: > >>>http://sourceforge.net/geronimo.php > >>>_______________________________________________ > >>>User-mode-linux-user mailing list > >>>User-mode-linux-user@lists.sourceforge.net > >>>https://lists.sourceforge.net/lists/listinfo/user-mode-linux-user > > > > ------------------------------------------------------- > > SF.Net email is sponsored by: > > Tame your development challenges with Apache's Geronimo App Server. > > Download it for free - -and be entered to win a 42" plasma tv or your > > very own Sony(tm)PSP. Click here to play: > > http://sourceforge.net/geronimo.php > > _______________________________________________ > > User-mode-linux-user mailing list > > User-mode-linux-user@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/user-mode-linux-user ------------------------------------------------------- SF.Net email is sponsored by: Tame your development challenges with Apache's Geronimo App Server. Download it for free - -and be entered to win a 42" plasma tv or your very own Sony(tm)PSP. Click here to play: http://sourceforge.net/geronimo.php _______________________________________________ User-mode-linux-user mailing list User-mode-linux-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-user
