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Tuesday, February 09, 2010
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SNAFU: Intel recommends GPGPU on a wrong server



Without any doubt, SC09 conference in Portland was marked with further development in HPC space with largest accent on reducing the cost of TFLOPS. As such, GPU technology is taking pole position in HPC space when it comes to processing power.

In our discussions with several HPC OEMs, we learned that approximately 90% of new HPC installations on order will feature at least one GPU board or whole GPGPU server "for evaluation purposes" i.e. Tesla S1070, S2070 or an 8GPU machine such as Tyan's FT72B7015 barebone carried by HPC vendors such as Colfax International or system integrators such as AVADirect.

Intel's GPGPU SNAFU - Reccomending Server that doesn't support GPGPU at all
Intel's GPGPU SNAFU - Reccomending Server that doesn't support GPGPU at all

Thus, a picture where Intel Corporation, maker of 80% CPUs inside all Top500 systems is promoting GPGPU was somewhat a surprise to us. At first, small-scale events such as SC09 aren't the ones clad by deceiving clouds of marketers and marketing messages but events where multi-million dollar contracts are signed and where there is business - there is no talk for "messaging".

As an example of the ideal link between Intel's Xeon 5500 processors and GPGPU products, Intel was promoting HP ProLiant DL160se G6 server, and the demos in front of the panel were all performed by nVidia Quadro FX 5800 and Tesla C1060 boards. According to Intel, ProLiant DL160se G6 should pack up to six GPUs in a single server.

And everything would be fine, if there wasn't for one small thing: according to HP's website, ProLiant DL160se G6 is a 1U server incapable of hosting a GPGPU card. Unlike Supermicro's new line of dual-GPU capable servers, DL160se G6 comes with very limited expansion options and nVidia Tesla C1060 or AMD FireStream 9170/9270 boards are not featured on the approved upgrade list.

Last minute banner SNAFU, we'd say.



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Comments:

Maybe possible; not recommended by: Craig Dunwoody on 11/27/2009
Hi Theo,

Some configs of HP DL160se-G6 have two available PCIe-x16-Gen2 expansion card slots, one full-height and one low-profile. There are
a number of PCIe extension products that could be used to connect this server to 6+ GPU cards mounted in external chassis.

I don't know if this type of config is specifically what Intel and HP had in mind to promote at SC09, but I think that it's at least possible.

As one example, you can plug in two NVIDIA Host Interface Cards (HICs), one full-height dual-port and one low-profile single-port. Each HIC port drives two GPUs, e.g. half of Tesla-S1070. You can therefore get six external GPUs connected, and if this server's mainboard BIOS can actually support that many GPUs, you can actually use them.

There are also a number of companies, e.g. www.nextio.com also exhibiting at SC09, offering various generic PCIe expansion chassis that might be able to connect 6+ external GPUs to this HP unit.

I personally believe that for many multi-GPU applications, a more efficient approach is to mount GPUs inside servers. Advantages include lower hardware cost/complexity, better hardware reliability, and in some cases also better performance, by giving each GPU card a dedicated true PCIe-x16-Gen2 8+8 GByte/sec (peak) full-duplex path all the way from CPUs.

As you pointed out, a number of companies
including Supermicro and Tyan currently offer relatively space-efficient 1RU and 4RU rackmountable server models that can support up to 2, 4, or 8 internal high-end 2slot-wide GPU cards, each with dedicated true PCIe-x16-Gen2 interface.

Several companies ran demos at SC09 using these servers as system building blocks. My company (www.graphstream.com) showed Supermicro and Tyan based 6GPU and 7GPU server configs in the Mellanox and Los Alamos Nat'l Lab booths.
Kakkoii by: Kakkoii on 11/26/2009
Intel knows the GPGPU market is going to rise, and since they have their own GPU in the works, it makes sense for them to show face with GPGPU. Trying to set their spot in this blossoming industry.
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