On Mon, Jul 21, 2008 at 10:58:56AM -0700, David Mathog wrote: > > "Lombard, David N" <[EMAIL PROTECTED]> wrote > > > On Fri, Jul 18, 2008 at 10:20:54PM -0700, [EMAIL PROTECTED] wrote: > > > > > > Hi All, > > > > > > I am wondering whether there is any mechanism to automatically > > > power down nodes (e.g., ACPI S3) when idle for some time, and > > > automatically wake up when requested (e.g., by WOL, some cluster > > > scheduler, ssh). I imagine that I could cut down power & cooling > > > on our system by more than 50%. Any hints? > > > > The key is whether S3 is supported on your nodes; it's usually not > > on servers. > > The key is more often than not "how badly broken is the BIOS"? We have > two IBM X3455 systems with identical CPUs and the one with the older > BIOS has CPU frequency control working, whereas the latest and greatest > BIOS breaks it. Here we're not talking about going all the way to S3, > just providing the option to spin a bit more slowly when the system > isn't busy. Also, as somebody mentioned earlier in this thread, WOL > which works but is not correctly initialized by the BIOS at power up is > incredibly common (here is one: Asus A8N5X motherboard).
I meant "supported" in the larger sense, so, in order: Hardware BIOS OS (kernel & drivers) How you configure and manage it all in the userland... with lots of fun interactions amongst them. Once you can get the node to go into, and *most* importantly, return from, S3, then you can work on managing it via the resource manager. > This is one instance where I wish the Federal government (and/or the > European Union) would get off its collective duff and set a standard ... > with this software when shipping a broken BIOS would result in fines. As a Libertarian, I will respectfully disagree :) -- David N. Lombard, Intel, Irvine, CA I do not speak for Intel Corporation; all comments are strictly my own. _______________________________________________ Beowulf mailing list, [email protected] To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
