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

[Matt Hope <Matt.Hope@xxxxxxxxxxxxxxx>]

-----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.

Matt

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