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fatalme
Beginner
110 Views

DP FLOPS of intel xeon 5680

Hi, I have used intel optimized LINPACK benchmark tool and I got a result of 70 GFLOPS on Intel xeon 5680. I think this should be for SP FLOP. Anybody knows the GFLOPS for DP FLOP? And how to calculate the theoretical peak performance for DP FLOP?
Thanks.
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5 Replies
TimP
Black Belt
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Peak DP performance is 3.33x10^9 ticks/sec (if Turbo is disabled) x 4 flops/tick x 12 cores (if HT is disabled) so your performance is a little short of expectation.
merwin101
Beginner
110 Views

Quoting TimP (Intel)
Peak DP performance is 3.33x10^9 ticks/sec (if Turbo is disabled) x 4 flops/tick x 12 cores (if HT is disabled) so your performance is a little short of expectation.

Doesn't the formula also hold if hyperthreading is enabled? My understanding is that even with hyperthreading enabled, each core can still execute at most 4 flops per tick, so the formula for peak DP performance in FLOPS is still the same. Hyperthreading only improves performance when there are less than 4 instructions ready for a given thread in a clock cycle, right? Or am I misunderstanding hyperthreading (and if this is the case, is there an additional x2 for hyperthreading, or is the factor something else?)

Thanks.

TimP
Black Belt
110 Views

Sorry, you're right, the Xeon architecture doesn't supply additional floating point resource for hyperthreading.
SKost
Valued Contributor II
110 Views

Quoting fatalme
Hi, I have used intel optimized LINPACK benchmark tool...

[SergeyK] Where could I download it from? Could you give a link, please?

and I got a result of 70 GFLOPS on Intel xeon 5680. I think this should be for SP FLOP. Anybody knows the GFLOPS for DP FLOP? And how to calculate the theoretical peak performance for DP FLOP?
Thanks.

SKost
Valued Contributor II
110 Views

Quoting fatalme
Hi, I have used intel optimized LINPACK benchmark tool...

[SergeyK] Where could I download it from? Could you give a link, please?

...


That was easy to find:

http://software.intel.com/en-us/articles/intel-linpack-benchmark-download-license-agreement/