Geoff Galitz
Sat, 19 Jul 2008 13:48:45 -0700
Many, many, many moons ago I wrote a plugin for the clustering framework (now defunct) that we used and I was a developer on back at UC Berkeley. It was quite simple... it simply checked to see if jobs were in the queue, if not it looked to see what nodes were free (using OpenPBS/Torque native commands), did the necessary parsing of a few backend config files and then issued standard shutdown commands to the idle nodes. When jobs started to back up in the queue, the plugin used WOL to start up nodes. It was in perl and less than 100 lines. I easily could have used IPMI instead, but many of the boxes we were using had better WOL support than IPMI. WOL is standard while IPMI can vary from vendor to vendor... so if your needs are no more complex than this, WOL is a good way to go. -geoff Geoff Galitz Blankenheim NRW, Deutschland http://www.galitz.org -----Original Message----- From: [EMAIL PROTECTED] [EMAIL PROTECTED] On Behalf Of Nathan Moore Sent: Samstag, 19. Juli 2008 22:02 To: beowulf@beowulf.org Subject: Re: [Beowulf] Green Cluster? I think the feature you're looking for is "Wake on LAN", http://en.wikipedia.org/wiki/Wake-on-LAN I've wondered similar things - the small cluster I run for a students/departmental use is generally off, except when I'm teaching computational physics, or have a student interested in a specific research project. It would be nice to be able to "turn on" a few machines (from home, at 11:30pm) when I have to run something substantial. If you find a good step-by-step resource describing how to do this, I'd love to hear about it. Nathan Moore On Sat, Jul 19, 2008 at 11:53 AM, Perry E. Metzger <[EMAIL PROTECTED]> wrote: [EMAIL PROTECTED] writes: > 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? Depending on the motherboard, there are ways to do this. You can do wake on network and other tricks. However, if you would really save half the power, that implies that your cluster is half idle. If it is really half idle, why aren't you simply shutting half of it down? Perry _______________________________________________ Beowulf mailing list, Beowulf@beowulf.org To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf -- - - - - - - - - - - - - - - - - - - - - - Nathan Moore Assistant Professor, Physics Winona State University AIM: nmoorewsu - - - - - - - - - - - - - - - - - - - - - _______________________________________________ Beowulf mailing list, Beowulf@beowulf.org To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf