[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Condor-users] Why do kflops and mips vary so much?

-----Original Message-----
From: Nick LeRoy [mailto:nleroy@xxxxxxxxxxx] 
Sent: 22 April 2010 19:00
To: condor-users@xxxxxxxxxxx
Cc: Matt Hope
Subject: Re: [Condor-users] Why do kflops and mips vary so much?

> Actually, there have been discussions here about whether it makes sense to 
> rerun the benchmarks at all.  After all, how often does a CPU get slower or 
> faster while the system is running?  Yes, I know that CPUs these days *do* 
> change their clocks, but nonetheless, these benchmarks are indented to capture 
> the system's capabilities, which should never change.

it's an interesting idea, but as data centres move to an active power management model: shutting down cores, reducing clockspeed and voltage in response not only to internal demands but external ones too (to the minute power prices for example) pretending that they never change is perhaps not the best option.

In many cases they don't change much, or are configured to not do so, so big clusters might benefit from just running it at start up and reporting that value for the life of the instance. Deciding that should be the way forward for everything is liable to be problematic in future me thinks.


Gloucester Research Limited believes the information provided herein is reliable. While every care has been taken to ensure accuracy, the information is furnished to the recipients with no warranty as to the completeness and accuracy of its contents and on condition that any errors or omissions shall not be made the basis for any claim, demand or cause for action.
The information in this email is intended only for the named recipient.  If you are not the intended recipient please notify us immediately and do not copy, distribute or take action based on this e-mail.
All messages sent to and from this email address will be logged by Gloucester Research Ltd and are subject to archival storage, monitoring, review and disclosure.
Gloucester Research Limited, 5th Floor, Whittington House, 19-30 Alfred Place, London WC1E 7EA.
Gloucester Research Limited is a company registered in England and Wales with company number 04267560.