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Re: Energy consumption vs % utilization?
In message <[email protected]>, Alex Rubenst ein writes: > > >Hello, > >I've done quite a bit of studyin power usage and such in datacenters over >the last year or so. > >> I'm looking for information on energy consumption vs percent utilization. In > >> other words if your datacenter consumes 720 MWh per month, yet on average >> your servers are 98% underutilized, you are wasting a lot of energy (a hot >> topic these days). Does anyone here have any real data on this? > >I've never done a study on power used vs. CPU utilization, but my guess is >that the heat generated from a PC remains fairly constant -- in the grand >scheme of things -- no matter what your utilization is. > I doubt that very much, or we wouldn't have variable speed fans. I've monitored CPU temperature when doing compilations; it goes up significantly. That suggests that the CPU is drawing more power at such times. Of course, there's another implication -- if the CPU isn't using the power, the draw from the power line is less, which means that much less electricity is being used. --Steve Bellovin, http://www.research.att.com/~smb