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Intel E5-2698 16core CPU

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Old   May 17, 2016, 11:36
Default Intel E5-2698 16core CPU
Andy Robertson
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Does anyone have any experience with the Intel 16 core CPUs?
Specifically we are looking at the E5-2698 v3 16 core 2.3GHz
Two sockets per motherboard for a 32 core compute node.

Our experience with the 16 core AMDs was not a good one.
The fact that every pair of cores had to share a floating point unit and every 4 cores had to share a memory channel, slowed the machine down quite a bit.

I am concerned that we may run into a similar issue with the Intel

Any help is appreciated
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Old   May 17, 2016, 12:30
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The problem with shared execution units does not exist with the Xeon CPUs.
The bottleneck will be a different one: Memory bandwidth. The CPU only has 4 memory channels which can be a limiting factor for CFD simulations on 16 cores. Unless you know that your applications are not bandwidth limited the E5-2698 v3 (v4 is available) might not be the ideal choice
For a typical CFD compute node you should rather go for the "frequency optimized" versions of the Xeon Processors with less cores. Xeon E5-2687W v4 is the latest and greatest.
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Old   May 18, 2016, 09:10
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Go check out the SpecRates on the site. For our last server they gave a good estimate of relative speed.

We are looking at a smaller system and may go 12 core. The newest V4 cores have DDR4 2400 which helps bandwidth and they are 15-20% faster than the V3s (at least in this CPU number).

The CPU price varies quite a lot between quite similar CPUs so that is also a factor.

We found CPU locking was a significant factor in our present cluster for CCM+.

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