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Workstation with new E5 Xeon Ivy-bridge

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Old   November 19, 2013, 09:59
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  #21
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Kim Bindesbøll Andersen
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Quote:
Originally Posted by RodriguezFatz View Post
What about one motherboard with two CPUs? Do they have twice the memory bandwidth, compared with a single CPU board?
The number of memory channels is associated with the individual CPU. So yes, two CPUs on one motherboard will totally have twice the memory bandwidth as a single CPU (of same type).

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Originally Posted by RodriguezFatz View Post
Do you get any improvement for 8-core license, when using two CPUs in one workstation?
I guess your question is: "Does a system with dual 4-core CPUs on one motherboard perform better than a single 8-core CPU?" (correct me if I am wrong).

As it appears in one of my previous posts above regarding scaling efficiency:
Quote:
Originally Posted by bindesboll View Post
From 4 to 8 cores: 0.62 (clearly memorybandwidth limited, more cores will not increase speed).
From 8 to 16 cores (Motherboard CPU interconnect): 0.92
The scaling from 4 to 8 cores is within a single CPU, showing a pretty poor scaling (0.62), which indicates that the calculation power of the 8-cores is restricted by the external bandwidth.
However, the scaling from 8 to 16 cores (going from 8 cores in a single CPU to 8 cores in two CPUs on the same motherboard) is very good (0.92), which indicates that the motherboard CPU-interconnect is adequate.
Conclusion: A system of dual 4-core CPUs will have a performance that is better than a single 8-core CPU by roughly a factor 0.92/0.62 = 1.5.

Please note that these numbers are based on cluster with Xeon E5-2670 (Sandy Bridge EP), whereas the new Xeon E5 26xx v2 (Ivy Bridge) might scale better as it has increased memory speed and cache. However, still I would expect the most efficient 8-core system to be a dual CPU motherboard with 2 x Xeon E5-2637 v2.

Best regards
Kim Bindesbøll
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Old   June 19, 2014, 18:06
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f-w
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Does anyone have any updates on this topic. How about actual benchmarks of a single node with dual e5-2600(series)v2 CPU's vs. a cluster of i7 nodes?
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Old   June 19, 2014, 18:37
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Erik
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Quote:
Originally Posted by f-w View Post
Does anyone have any updates on this topic. How about actual benchmarks of a single node with dual e5-2600(series)v2 CPU's vs. a cluster of i7 nodes?
I tested dual XEON-E5 vs 2 i7s. Post is here:
42% gain from dual E5-2643 to i7-3930K (x2)

I also tested the exact same benchmark on only one i7 and saw that it solved in almost exactly twice the time. Performance scaling from 1 to two machines was 100.2%. Better than perfect with infiniband.

In the past I had used gigE and saw 99% efficient performance scaling going from 1 to two machines, but this was on a large problem, smaller models do not scale as well of course.
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Old   November 24, 2014, 15:11
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Maybe its too late, but please , check this out

single i7 MUCH faster than dual xeon E5-2650 v3 !!!
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