On 7 April 2014 10:56, Ewan MacMahon <[log in to unmask]> wrote:
>> -----Original Message-----
>> From: Testbed Support for GridPP member institutes [mailto:TB-
>> [log in to unmask]] On Behalf Of Sam Skipsey
>>
>> (Xeons have hyperthreading, more on-die cache, more memory bandwidth, and
>> better performance-per-watt... and given the memory use of WLCG jobs, you
>> might expect that those things would be important in the overall real-
>> world performance of code, vs the pure-CPU test values in HEPSPEC).
>>
> Though from a funding model POV, the ideal CPU is the one with the
> highest ratio of HS06 score to actual speed.
Sure, but (to give the response your statement is artfully constructed
to produce) that's because the funding model assumes that HS06 (or any
cpu-bound test with little memory-bandwidth dependance) is a good
enough proxy for real job performance.
(It's clear reading between the lines of several test results that
HS06 scores do not scale the same way that real jobs do, and this is
an entirely expected phenomenon.)
From an "actually letting experiments do more work per unit time"
perspective, the Xeons win ;)
Sam
>
> Also, £600 for an i5 desktop seems a bit high; is that with a monitor?
>
> Ewan
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