Power consumption -- real vs actual
jal at mdacorporation.com
Mon Apr 5 14:20:22 CDT 2010
> > FYI, commands were
> > CPU heater: dd if=/dev/zero of=/dev/null & 8 to 16 times
> That's not a terribly good CPU-intensive load. Try something like
> this a few times in parallel
> pi=$(echo "scale=100000; 4*a(1)" | bc -l) &
> I can feel the space under my desk heating up after just a few seconds
> of this...
Switching to Matt's suggested heater, and revising tar to pipe to a dd (apparantly tar can tell when you are throwing away it's output...), I get 427 watts. Or, 413 watts, after a few minutes. Or 420, after a few more. So this is a little more like what would be expected from the calc website (252).
cpu heater: pi=$(echo "scale=100000; 4*a(1)" | bc -l) & ( 8 times )
disk heater: tar cf - /amsdata | dd of=/dev/null
The question remains what is it actually measuring?
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