Gigabyte GA-7PESH1 Review: A Dual Processor Motherboard through a Scientist’s Eyes
by Ian Cutress on January 5, 2013 10:00 AM EST- Posted in
- Motherboards
- Gigabyte
- C602
USB Speed
For this benchmark, we run CrystalDiskMark to determine the ideal sequential read and write speeds for the USB port using our 240 GB OCZ Vertex3 SSD with a SATA 6 Gbps to USB 3.0 converter. Then we transfer a set size of files from the SSD to the USB drive using DiskBench, which monitors the time taken to transfer. The files transferred are a 1.52 GB set of 2867 files across 320 folders – 95% of these files are small typical website files, and the rest (90% of the size) are the videos used in the Sorenson Squeeze test.
USB speed is dictated by the chipset and the BIOS implementation, and the GA-7PESH1 performance is comparable to our Z77/X79 testing.
DPC Latency
Deferred Procedure Call latency is a way in which Windows handles interrupt servicing. In order to wait for a processor to acknowledge the request, the system will queue all interrupt requests by priority. Critical interrupts will be handled as soon as possible, whereas lesser priority requests, such as audio, will be further down the line. So if the audio device requires data, it will have to wait until the request is processed before the buffer is filled. If the device drivers of higher priority components in a system are poorly implemented, this can cause delays in request scheduling and process time, resulting in an empty audio buffer – this leads to characteristic audible pauses, pops and clicks. Having a bigger buffer and correctly implemented system drivers obviously helps in this regard. The DPC latency checker measures how much time is processing DPCs from driver invocation – the lower the value will result in better audio transfer at smaller buffer sizes. Results are measured in microseconds and taken as the peak latency while cycling through a series of short HD videos - under 500 microseconds usually gets the green light, but the lower the better.
As a workstation motherboard, having a low DPC latency would be critical for recording and analyzing time sensitive information. Scoring 110 microseconds at its peak latency is great for this motherboard.
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mayankleoboy1 - Saturday, January 5, 2013 - link
Ian :How much difference do you think Xeon Phi will make in these very different type of Computations?
Will buying a Xeon Phi "pay itself out" as you said in the above comments ? (or is xeon phi linux only ?)
IanCutress - Saturday, January 5, 2013 - link
As far as we know, Xeon Phi will be released for Linux only to begin with. I have friends who have been able to play with them so far, and getting 700 GFlops+ in DGEMM in double precision.It always comes down to the algorithm with these codes. It seems that if you have single precision code that doesn't mind being in a 2P system, then the GPU route may be preferable. If not, then Phi is an option. I'm hoping to get my hands on one inside H1 this year. I just have to get my hands dirty with Linux as well.
In terms of the codes used here, if I were to guess, the Implicit Finite Difference would probably benefit a lot from Xeon Phi if it works the way I hope it does.
Ian
mayankleoboy1 - Saturday, January 5, 2013 - link
Rather stupid question, but have you tried using PGO builds ?Also, do you build the code with the default optimizations, or use the MSVC equivalent switch of -O2 ?
IanCutress - Saturday, January 5, 2013 - link
Using Visual Studio 2012, all the speed optimisations were enabled including /GL, /O2, /Ot and /fp:fast. For each part I analysed the sections which took the most time using the Performance Analysis tools, and tried to avoid the long memory reads. Hence the Ex-FD uses an iterative loading which actually boosts speed by a good 20-30% than without it.Ian
Klimax - Sunday, January 6, 2013 - link
Interesting. Why not Ox (all optimisations on)BTW: Do you have access to VTune?
IanCutress - Wednesday, January 9, 2013 - link
In case /Ox performs an optimisation for memory over speed in an attempt to balance optimisations. As speed is priority #1, it made more sense to me to optimise for that only. If VS2012 gave more options, I'd adjust accordingly.Never heard of VTune, but I did use the Performance Analysis tools in VS2012 to optimise certain parts of the code.
Ian
Beenthere - Saturday, January 5, 2013 - link
Business and mobo makers do not use 2P mobos to get high benches or performance bragging rights per se. These systems are build for bullet-proof reliability and up time. It does no good for a mobo/system to be 3% faster if it crashes while running a month long analysis. These 2P mobos are about 100% reliability, something rarely found in a enthusiasts mobo.Enterprise mobos are rarely sold by enthusiast marketeers. Newegg has a few enterprise mobos listed primarily because they have started a Newegg Biz website to expand their revenue streams. They don't have much in the line of true enterprise hardware however. It's a token offering because manufacturers are not likely to support whoring of the enterprise market lest they lose all of their quality vendors who provide customer technical product support.
psyq321 - Sunday, January 6, 2013 - link
Actually, ASUS Z9PE-D8 WS allows for some overclocking capabilities.CPU overclocking with 2P/4P Xeon E5 (2600/4600 sequence) is a no-go because Intel explicitly did not store proper ICC data so it is impossible to manipulate BCLK meaningfully (set the different ratios). Oh, and the multipliers are locked :)
However, Z9PE D8 WS allows memory overclocking - I managed to run 100% 24/7 stable with the Samsung ECC 1600 DDR3 "low voltage" RAM (16 GB sticks) - just switching memory voltage from 1.35v to 1.55v allows overclocking memory from 1600 MHz to 2133 MHz.
Why would anyone want to do that in a scientific or b2b environment? The only usage I can see are applications where memory I/O is the biggest bottleneck. Large-scale neural simulations are one of such applications, and getting 10 GB/s more of memory I/O can help a lot - especially if stable.
Also, low-latency trading applications are known to benefit from overclocked hardware and it is, in fact, used in production environment.
Modern hardware does tend to have larger headrooms between the manufacturer's operating point and the limits - if the benefit from an overclock is more benefitial than work invested to find the point where the results become unstable - and, of course, shorter life span of the hardware - then, it can be used. And it is used, for example in some trading scenarios.
Drazick - Saturday, January 5, 2013 - link
Will You, Please, Update Your Google+ Page?It would be much easier to follow you there.
Ryan Smith - Saturday, January 5, 2013 - link
Our Google+ page is just a token page. If you wish to follow us then your best option is to follow our RSS feeds.