Hi,
So, the reason you don't want to buy Desktop Core i5s for a server
room is that they're missing quite a lot of stuff that the equivalent
(more expensive) Xeon E5s have in them...
(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).
Sam
On 6 April 2014 09:19, Daniel Traynor <[log in to unmask]> wrote:
> I think hepsepc pretty much scales with Hz and if they are 4 real cores then 20 is probably about right for 3.4Ghz.
>
> Adding an SSDs to a C6100 (24 threads) showed no improvement in hepsepc, and did not see any improvement in real life jobs.
>
> There might well some cases where a high Hz cpu would be the right choice but I would still put them in a server box for space, power redundancy, ipmi.
>
> It would be interesting to see what the hep spec of the new kit people have brought recently is though?
>
> dan
>
> ********************************************
> Dr Daniel Traynor, Grid cluster manager
> Tel: +44(0)2078825059, QML
> ********************************************
>
> On 6 Apr 2014, at 08:57, Mark Slater <[log in to unmask]> wrote:
>
>> Hi All,
>>
>> For comparison purposes and completeness, I've just run some HS06 benchmarks on some basic Tier3 desktops (i5-3570 CPU @ 3.40GHz) and got some surprising results. On these 4 core machines running 32-bit SL 6.5, I got a total HS06 of 83 => 20.75 HS06 per physical core!! This is *massively* better than any server kit we've got or have just bought and as they only cost ~600 GBP I'm wondering if I should have been buying roomfulls of these instead of expensive stuff!
>>
>> Is this expected? Am I doing something obviously wrong? The only thing I can think of at present is that there's some effect with having SSD drives instead of hard drives but I would like to think HS06 is independent of I/O.
>>
>> Any ides/comments??
>>
>> Thanks!
>>
>> Mark
>>
>> P.S. It's worth noting that http://www.cpubenchmark.net puts one of our typical Xeons at ~10K and the desktop i5 at 7K!
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