Seems to be some excitement in Europe over Xen, a paravirtualisation package.
Ta Andy On 09/10/2007, Joe Landman <[EMAIL PROTECTED]> wrote: > > > Jeffrey B. Layton wrote: > > The recent emails from rgb and Doug lead me to a question. Has anyone > > tested codes running under a VM versus running them "natively" on > > the hardware (native isn't a good word and I hope everyone gets my > > meaning)? The last word I heard is that performance takes a substantial > > You have two major types, the heavyweight emulators (VMware, et al) and > the lighter weight hypervisors. I have seen studies of various codes > that show not a huge hit ... the caveat being that these codes spent > very little time in system calls (usually thunked to the host somehow) > and most of the time computing. > > > hit if you are running a code in a VM. Some of the reasons are that the > > code has only virtualized access to the hardware (particularly the NICs) > > and memory management is a bit more difficult (although Barcelona with > > nested page tables should help there). I do remember VirtualIron saying > > that they had IB drivers so that the VM had direct access to the hardware. > > The more layers you have to pass through, the lower your overall > performance (of course). > > > > > Thanks! > > > > Jeff > > > > _______________________________________________ > > Beowulf mailing list, [email protected] > > To change your subscription (digest mode or unsubscribe) visit > > http://www.beowulf.org/mailman/listinfo/beowulf > > > -- > Joseph Landman, Ph.D > Founder and CEO > Scalable Informatics LLC, > email: [EMAIL PROTECTED] > web : http://www.scalableinformatics.com > http://jackrabbit.scalableinformatics.com > phone: +1 734 786 8423 > fax : +1 866 888 3112 > cell : +1 734 612 4615 > _______________________________________________ > Beowulf mailing list, [email protected] > To change your subscription (digest mode or unsubscribe) visit > http://www.beowulf.org/mailman/listinfo/beowulf > _______________________________________________ Beowulf mailing list, [email protected] To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
