[GE users] Slots, Machines & CPUs

Olesen, Mark Mark.Olesen at emcontechnologies.com
Thu Apr 17 14:08:07 BST 2008

> Is the number of slots set per host during the installation of the
> execution
> host software and its then fixed (i.e. it's not smart enough to see
> when a
> CPU is missing)?

The 'slots' are a queue property or a queue instance property and does
not necessarily reflect the number of cpus. This is a good thing.

Example 1:
We have a number of dual-cpu, dual-core machines that report having 4
cpus, but we configure them as having only 2 slots. We get better
performance using a single core per cpu (eg, 8 cpus spread over 4
machines is about 30% faster than 8 cores across 2 machines).

Example 2:
Nastran is a notorious IO hog. The special fea queue is configured with
1 slot per node, regardless of number of cpus, cores, etc.
Other queues on the same machine have a more realistic number of slots.
The fea queue is subordinate to other queues on the machine and other
queues on the machine are subordinate to the fea queue

This e-mail message and any attachments may contain 
legally privileged, confidential or proprietary Information, 
or information otherwise protected by law of EMCON 
Technologies, its affiliates, or third parties. This notice 
serves as marking of its ?Confidential? status as defined 
in any confidentiality agreements concerning the sender 
and recipient. If you are not the intended recipient(s), 
or the employee or agent responsible for delivery of this 
message to the intended recipient(s), you are hereby 
notified that any dissemination, distribution or copying 
of this e-mail message is strictly prohibited. 
If you have received this message in error, please 
immediately notify the sender and delete this e-mail 
message from your computer.

To unsubscribe, e-mail: users-unsubscribe at gridengine.sunsource.net
For additional commands, e-mail: users-help at gridengine.sunsource.net

More information about the gridengine-users mailing list