[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Condor-users] Windows wake-on-lan / "green" computing environments query
- Date: Wed, 1 Apr 2009 09:44:19 -0700
- From: David Brodbeck <brodbd@xxxxxxxxxxxxxxxx>
- Subject: Re: [Condor-users] Windows wake-on-lan / "green" computing environments query
On Mar 31, 2009, at 5:05 PM, Rob wrote:
Say, you have a pool of 1000 PCs and there is a submitted job that
cannot find a resource
to run on, possibly because Condor has sent too many PCs into
You should then decide to wake up an appropriate PC.
How can you decide which PC in hibernation is the right one?
Condor can help if it has stored the ClassAds of the hibernated PCs,
before hibernating them.
Therefore, if Condor remembers the ClassAds of PCs it has
hibernated, it can then also
quickly decide which hibernated PC should be woken up by WOL to run
That would obviously be the best situation. I get the impression that
it's a planned feature, but it's not implemented in 7.2. Obviously an
external script isn't going to have all the information it needs to
wake up the "best" machine. However, our cluster is fairly
homogenous, so I think I'm going to write a fairly naive script that
just wakes up machines based on the number of idle jobs in the queue.
[ A practical problem here: immediately after start-up, a PC is in
Owner state ]
[ and thus it takes a while before it becomes available for running
You could get around this by using suspend-to-RAM or suspend-to-disk
instead of actually shutting the machine down. There's support for
that in Condor already, but it won't work in my case because my
machines won't respond to wake-on-LAN when they're hibernating, only
when they're off.
System Administrator, Linguistics
University of Washington