Energy Consumption

We tested the energy consumption of our servers for a one-minute period in several scenario. The first scenario is the point where the server under testing performs best in MySQL: the highest throughput just before the response time goes up significantly. 

To test the power usage of the FPU, we measure the power consumption when POV-Ray was using all available threads. 

SKU TDP
(on paper)
spec
Idle
Server

W
MySQL
Best Throughput
at Lowest Resp. Time (*)
(W)
POV-Ray
100% CPU load
Dual Xeon E5-2699 v4 2x145 W 106 412 425
Dual Xeon 8176  2x165W 190 300 453
Dual EPYC 7601 2x180W 151 321 327

Both the Xeon 8176 and Dual EPYC server had a few more additional components (a separate 10 GBe card for example) than the Dual Xeon E5-2699v4 system, but that does not fully explain why idle power is so much higher, especially on the Dual Xeon 8176. We lacked the time to fully investigate this, and the last two systems have relatively new firmware.

The only conclusion that we can draw so far, is that the EPYC 7601 is likely to draw more power when running integer applications, while the rather wide FP units of the Intel CPUs are real power hogs even if they do not run heavy AVX applications. To be continued...

Floating Point performance Closing Thoughts
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  • CajunArson - Tuesday, July 11, 2017 - link

    And another followup: The time kernel compilation on the i9 7900X got almost a factor of 2 speedup over the Ubuntu 16.04 using more modern distros. Reply
  • tamalero - Tuesday, July 11, 2017 - link

    How is that different if AMD ran stuff that is extremely optimized for them? Reply
  • Friendly0Fire - Tuesday, July 11, 2017 - link

    That's kinda the point? You want to benchmark the CPUs in optimal scenarios, since that's what you'd be looking at in practice. If one CPU's weakness is eliminated by using a more recent/tweaked compiler, then it's not a weakness. Reply
  • coder543 - Tuesday, July 11, 2017 - link

    Rather, you want to test under practical scenarios. Very few people are going to be running 17.04 on production grade servers, they will run an LTS release, which in this case is 16.04.

    It would be good to have benchmarks from 17.04 as another point of comparison, but given how many things they didn't have time to do just using 16.04, I can understand why they didn't use 17.04.
    Reply
  • Santoval - Wednesday, July 12, 2017 - link

    A compromise can be found by upgrading Ubuntu 16.04's outdated kernel. Ubuntu LTS releases include support for rolling HWE Stacks, which is a simple meta package for installing newer kernels compiled, modified, tested and packaged by the Ubuntu Kernel Team, and installed directly from the official Ubuntu repositories (not via a Launchpad PPA). With HWE 16.04 LTS can install up to the kernel of 18.04 LTS.

    I also use 16.04 LTS + HWE (it just requires installing the linux-generic-hwe-16.04 package), which currently provides the 4.8 kernel. There is even a "beta" version of HWE (the same package plus an -edge at the end) for installing the 4.10 kernel (aka the kernel of 17.04) earlier, which will normally be released next month.

    I just spotted various 4.10 kernel listings after checking in Synaptic, so they must have been added very recently. After that there are two more scheduled kernel upgrades, as is shown in the following link. Of course HWE upgrades solely the kernel, it does not upgrade any application or any of the user level parts to a more recent version of Ubuntu.
    https://wiki.ubuntu.com/Kernel/RollingLTSEnablemen...
    Reply
  • CajunArson - Tuesday, July 11, 2017 - link

    Considering the similarities between RyZen and Haswell (that aren't coincidental at all) you are already seeing a highly optimized set of RyZen results.

    But I have no problem seeing RyZen be tested with the newest distros, the only difference being that even Ubuntu 16.04 already has most of the optimizations for RyZen baked in.
    Reply
  • coder543 - Tuesday, July 11, 2017 - link

    What similarities? They're extremely different architectures. I can't think of any obvious similarities. Between the CCX model, caches being totally different layouts, the infinity fabric, Intel having better AVX-256/512 stuff (IIRC), etc.

    I don't think 16.04 is naturally any more optimized for Ryzen than it is for Skylake-SP.
    Reply
  • CajunArson - Tuesday, July 11, 2017 - link

    Oh please, at the core level RyZen is a blatant copy-n-paste of Haswell with the only exception being they just omitted half the AVX hardware to make their lives easier.

    It's so obvious that if you followed any of the developer threads for people optimizing for RyZen they say to just use the Haswell compiler optimizations that actually work better than the official RyZen optimization flags.
    Reply
  • ddriver - Tuesday, July 11, 2017 - link

    Can't tell if this post is funny or sad. Reply
  • CajunArson - Tuesday, July 11, 2017 - link

    It's neither: It's accurate.

    Don't believe me? Look at the differences in performance of the holy 1800X over multiple Linux distros ranging from pretty new (OpenSuse Tumbleweed) to pretty old (Fedora 23 from 2015): http://www.phoronix.com/scan.php?page=article&...

    Nowhere near the variation that we see with Skylake X since Haswell was already a solved problem long before RyZen lauched.
    Reply

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