On Jan 17, 2008 1:09 AM, Joe Landman <[EMAIL PROTECTED]> wrote: > That said, and the point of this is that many HPC apps are rapidly > becoming IO bound, as they need to move ginormous (meaning really large) > amounts of data to and from disk, and MPI codes usually need to move > data at the lowest latency possible. > > There VMs which negatively impact IO performance (bandwidth/latency) > will be problematic. > > What would be interesting is a VM OS bypass for IO. VM talk directly to > hardware. Not sure it is possible though, unless you are using a > hypervisor, and a thin VM (OpenVZ?).
I believe Xen is working towards that. For instance, their latest release (Xen 3.2.0) has: - Preliminary PCI pass-through support (using appropriate Intel or AMD I/O-virtualisation hardware) I have read on the Xen lists that some folks have successfully increased network performance this way. OpenVZ is a possibility and it definitely is "thinner" than Xen in this aspect. This is why we are using the libvirt library which is starting to include support for containers like OpenVZ. > > Just some thoughts, hopefully not all that flammable (Jeff, what is > that rule? I am being asked, and I don't have an answer ...) Not at all. In fact, its great to hear and learn from you guys. Thanks! Regards, Meng Kuan _______________________________________________ Beowulf mailing list, Beowulf@beowulf.org To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
