The Intel Xeon E7 v2 Review: Quad Socket, Up to 60 Cores/120 Threads
by Johan De Gelas on February 21, 2014 6:00 AM EST- Posted in
- IT Computing
- Intel
- Xeon
- Ivy Bridge EX
- server
- Brickland
OpenFoam
Several of our readers have already suggested that we look into OpenFoam. That's easier said than done, as good benchmarking means you have to master the sofware somewhat. Luckily, my lab was able to work with the professionals of Actiflow. Actiflow specialises in combining aerodynamics and product design. Calculating aerodynamics involves the use of CFD software, and Actiflow uses OpenFoam to accomplish this. To give you an idea what these skilled engineers can do, they worked with Ferrari to improve the underbody airflow of the Ferrari 599 and increase its downforce.
The Ferrari 599: an improved product thanks to Openfoam.
We were allowed to use one of their test cases as a benchmark, but we are not allowed to discuss the specific solver. All tests were done on OpenFoam 2.2.1 and openmpi-1.6.3.
Many CFD calculations do not scale well on clusters, unless you use InfiniBand. InfiniBand switches are quite expensive and even then there are limits to scaling. We do not have an InfiniBand switch in the lab, unfortunately. Although it's not as low latency as InfiniBand, we do have a good 10G Ethernet infrastructure, which performs rather well.
So we added a fifth configuration to our testing: the quad-node Intel Server System H2200JF. The only CPU that we have eight of right now is the Xeon E5-2650L 1.8GHz. Yes, it is not perfect, but this is the start of our first clustered HPC benchmark. This way we can get an of idea whether or not the Xeon E7 v2 platform can replace a complete quad-node cluster system and at the same time offer much higher RAM capacity.
The results are pretty amazing: the quad Xeon E7-4980 v2 runs circles around our quad-node HPC cluster. Even if we were to outfit it with 50% higher clocked Xeons, the quad Xeon E7 v2 would still be the winner. Of course, there is no denying that our quad-node cluster is a lot cheaper to buy. Even with an InfiniBand switch, an HPC cluster with dual socket servers is a lot cheaper than a quad socket Intel Xeon E7 v2.
However, this bodes well for the soon to be released Xeon E5-46xx v2 parts. QPI links are even lower latency than InfiniBand. But since we do not have a lot of HPC testing experience, we'll leave it up to our readers to discuss this in more detail.
Another interesting detail is that the Xeon 2650L at 1.8GHz is about twice as fast as a Xeon L5650. We found AVX code inside OpenFoam 2.2.1, so we assume that this is one of the cases where AVX improves FP performance tremendously. Seasoned OpenFoam users, let us know whether is the accurate assessment.
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Brutalizer - Tuesday, February 25, 2014 - link
Clusters can not replace SMP servers. Clusters can not run SMP workloads.Kevin G - Tuesday, February 25, 2014 - link
I'm sorry, but it is considered best practice to run databases in pairs for redundancy. For example, here is an Oracle page explaining how clustering is used to maintain high availability: http://docs.oracle.com/cd/B28359_01/server.111/b28...Other databases like MySQL and MS SQL Server have similar offerings.
There is a reason why big hardware like this is purchased in pair or sets of three.
EmmR - Friday, March 14, 2014 - link
Kevin G. you are actually correct. We are in the process for comparing performance of Power7+ vs Xeon v2 for SAP batch workload and we got pretty much the same arguments from our AIX guys as Brutalizer mentionned.We are using real batch jobs rather than an synthetic benchmark and we set up each system to compare core-for-core, down to running a memory defrag on the Power system to make sure memory access is a good as possible. The only thing we could not fix is that in terms of network access, the Intel system was handicapped.
What we are seeing is that we can tune the Intel system to basically get similar performance (< 5% difference of total runtime) than from the Power7+ system (P780). This was quite unexpected but it's an illustration of how far Intel and the hardware vendors building servers/blades based on those CPUs have come.
Kevin G - Monday, March 17, 2014 - link
Looking at the Xeon E7 V2's right now is wise since they're just hitting market and the core infrastructure is expected to last three generations. It wouldn't surprise me if you can take a base system today using memory daughter cards and eventually upgrade it to Broadwell-EX and more DDR4 memory by the end of the product life cycle. This infrastructure is going to be around for awhile.POWER7+ on the other hand is going to be replaced by the POWER8 later this year. I'd expect it to perform better than the POWER7+ though how much will have to wait for the benchmarks after it is released. There is always going to be something faster/better/cheaper coming down the road in the computing world. Occasionally waiting makes sense due to generational changes like this. Intel and IBM tend to leap frog each other and it is IBM's turn to jump.
Ultimately if you gotta sign the check next week, I'd opt for the Xeon but if you can hold off a few months, I'd see what the POWER8 brings.
EmmR - Monday, March 17, 2014 - link
Power8 will be interesting to look at, but based on current data it will have to yield a pretty impressive performance boost over Power7+ (and Xeon v2) in order to be competitive on a performance per dollar spent.Kevin G - Monday, March 17, 2014 - link
IBM is claiming two to three times the throughput over POWER7+. Most of that gain isn't hard to see where it comes from: increasing the core count from 8 to 12. That change alone will put it ahead of the Xeon E7 v2's in terms of raw performance. Minor IPC and clock speed increases are expected too. The increase from 4 way to 8 way SMT will help some workloads, though it could also hurt others (IBM does support dynamic changes in SMT so this is straightforward to tune). The rest will likely come from system level changes like lower memory access times thanks to the L4 cache on the serial-to-parallel memory buffer and more bandwidth all around. What really interests me is that IBM is finally dropping the GX bus they introduced for coherency in the POWER4. What the POWER8 does is encapsulates coherency over a PCIe physical link. It'll be interesting to see how it plays out.As you may suspect, the cost of this performance may be rather high. We'll have to see when IBM formally launches systems.
amilayajr - Thursday, March 6, 2014 - link
I think Brutalizer is saying that, this new Xeon CPU is pretty much for targeted market. Unix since then has been the backbone of the internet, Intel as much as they can they want to cover the general area of server market. Sure it's a nice CPU, but as reliability goes, I would rather use a slower system but reliable in terms of calculations. I would still give intel the thumbs up for trying something new or updating the cpu. As for replacing unix servers for large database enterprise servers, probably not in a long time for intel. I would say to intel to leave on the real experts on this area that just focuses on these market. Intel is just covering their turf for smaller scale server market.Kevin G - Thursday, March 6, 2014 - link
The x86 servers have caught up in RAS features. High end features like hot memory add/remove are available on select systems. (Got a bad DIMM? Replace it while the systems is running.) Processor add/remove on a running system is also possible on newer systems but requires some system level support (though I'm not immediately familiar with a system offering it.) In most cases with the base line RAS features, Xeons are more than good enough for the job. Hardware lockstep is also an option on select systems.Uses for ultra high end features like two bit error correction for memory, RAID5-like parity across memory channels, and hot processor add/remove are a very narrow niche. Miscellaneous features like instruction replay don't actually add much in terms of RAS (replay on Itanium is used mainly to fill up unused instruction slots in its VLIW architecture, where as lock step would catch a similar error in all cases). Really, the main reason to go with Unix is on the software side, not the hardware side anymore.
djscrew - Wednesday, March 12, 2014 - link
"Sound like we are solving a problem with hardware instead of being innovative in software."that doesn't happen... ever... http://www.anandtech.com/show/7793/imaginations-po... ;)
mapesdhs - Sunday, February 23, 2014 - link
Brutalizer writes;
"Some examples of Scale-out servers (clusters) are all servers on the Top-500 supercomputer list. Other examples are SGI Altix / UV2000 servers or the ScaleMP server, they have 10,000s of cores and 64 TB RAM or more, i.e. cluster. Sure, they run a single unified Linux kernel image - but they are still clusters. ..."
Re the UV, that's not true at all. The UV is a shared memory system with a hardware MPI
implentation. It can scale codes well beyond just a few dozen sockets. Indeed, some key
work going on atm is how to scale relevant codes beyond 512 CPUs, not just 32 or 64.
The Cosmos installation is one such example. Calling a UV a cluster is just plain wrong.
Its shared memory architecture means it can handle very large datasets (hundreds of
GB) and extremely demanding I/O workloads; no conventional 'cluster' can do that.
Ian.