[Beowulf] power usage, Intel 5160 vs. AMD 2216
jmdavis1 at vcu.edu
Thu Jul 12 13:14:09 EDT 2007
I have spun up Sun x4100 dual core, dual processor to 100% processor
usage and normal HD writes and measured the actually powerusage at 267
watts. Obviously higher than normal HD usage (such as swapping) would
drive the number up, but I was very pleased with these results as well
as those of the x2200 machines.
These tests were made with CentOS 4 installed.
Donald Becker wrote:
> On Tue, 10 Jul 2007, Jon Bernard wrote:
>>Vendor A estimates that at peak load a compute node with two AMD 2216s,
>>4 GB of 667 DDR2 RAM, a hard drive, and an IB board will draw 265 watts.
>>Vendor B estimates that such a node will draw 450 watts.
> Considering that the regular 2216 is 95W peak (the 'HE' version is about
> 65W), and the memory and IB card are both pretty warm, 265 watts is
> unrealistic. Multiply a realistic max power by a power supply
> efficiency and you'll get about 450 watts.
> There is way to get that lower number: 2216HE processors, and very efficient
> (93% would be exceptional, high 80s more realistic) power supplies. But
> that will be significantly more expensive. Easily enough $$ that you would
> know if that's what you are buying. (We use 'HE' processors, special
> memory and highly-efficient power supplies in our blade systems to make
> the thermals work, and system price/MIPS looks pretty bad compared to
> standard 1U products.)
> The chipsets and base processors are same between vendors, and the IB
> cards and disks are about the same. The memory power use will vary a bit,
> but you might get different numbers between the sample and shipped nodes.
> The biggest variation will be the power supply efficiency. And even there
> it will be vary significantly with the power draw.
> We've measured between 50% and 93% efficiency. The worst are the supplies
> in old generic 1U cases, which hopefully we won't see again. There is
> a significant cost difference between today's low-end, low-efficiency
> supplies and the better 80+% units. Doing an extra conversion e.g. to
> 50VDC then to the final board voltage, won't improve the
> overall numbers, but will move the conversion and thermals to "behind the
> We could get into an interesting discussion about the best way to decrease
> the typical power use of a cluster. The best way to do this is with
> software -- laptop-style power control, and powering nodes down. But when
> purchasing and installing clusters you have to design for that
> long-running job that stays at the peak power draw and thermal state of
> the cluster.
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