Posts by Leycester Whewell
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(Message 1394)
Posted 23 Jul 2013 by 
Leycester Whewell
Post: I looked at comparing tasks on my Raspberry Pi (RPi)and my i7 laptop but found that the nature of those tasks can vary greatly. I have Einstein tasks running on my laptop, which take about 110mins to complete per thread, whereas AsteroidAtHome (AAH) on RPi was taking 80h (at 800MHz clock). When I looked at the details of those tasks, the Einstein was typically 17.5TFlops, whereas AAH was 315TFlops, so scaling up my laptop to the AAH task should take about 33h to complete. On that basis, a RPi is roughly equivalent to 40% of a thread in an i7 laptop, ie 20 RPis would perform the same throughput, at a cost of $700, cheaper than the laptop. A few extra £ would be needed for the SD cards, a common power supply (lots of individual mains plug transformers is inefficient), ethernet cables and an ethernet switch, but it would still prove cheaper. I would probably reduce this to 15 RPis by overclocking and use a single 16 way hub for comms. |