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> From: discuss-bounces+blu=nedharvey.com at blu.org [mailto:discuss- > bounces+blu=nedharvey.com at blu.org] On Behalf Of Matt Shields > > A long time ago I got fed up with trying to calculate amperage, so I > invested in a clamp on ammeter. Then I test my servers when I get them and > record the high and average usage. This is an excellent practice. I have been using kill-a-watt, but the clamp is more convenient. Besides knowing the A, you also want to know the VA and W so you can spec your UPS appropriately. One thing to be keenly aware of is that power draw of a server is variable. To reach max power, you need to find ways of stressing the high power components - Usually the CPU and GPU (if any.) But a "while 1 { ; }" loop will not stress much of the cpu, so it doesn't do a good job of reaching max power. The best stuff will be things like the AES instruction set, and generating random numbers and doing parallel compression. Get the max power of the system and fluff it a bit.
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