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What's a CPU to do when it has nothing to do?
By Thom Holwerda on 2018-10-11 20:12:17

It would be reasonable to expect doing nothing to be an easy, simple task for a kernel, but it isn't. At Kernel Recipes 2018, Rafael Wysocki discussed what CPUs do when they don't have anything to do, how the kernel handles this, problems inherent in the current strategy, and how his recent rework of the kernel's idle loop has improved power consumption on systems that aren't doing anything.

I had no idea doing nothing was this complex.

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CppCast
By kwan_e on 2018-10-11 21:48:20
I think there was an episode of CppCast about embedded systems a while ago, about how making the microcontroller/cpu in microwave ovens slightly more efficient when idle could actually significantly reduce the carbon footprint of the US.
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Comment by flanque
By flanque on 2018-10-12 07:06:55
> I had no idea doing nothing was this complex.
You clearly haven't worked in an enterprise organisation. ;-)
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RE: Comment by flanque
By The123king on 2018-10-12 09:37:14
Or a government organisation.
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RE[2]: Comment by flanque
By placebo on 2018-10-12 13:08:07
Or an organization.

Edited 2018-10-12 13:08 UTC
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I assume...
By fretinator on 2018-10-12 13:20:58
I assume it's called the Costanza protocol.
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Unawareness
By dionicio on 2018-10-13 14:22:37
Unawareness is a privilege as recent as Neolithic.

Sleep. Maybe Dream. Of electric sheep.

Edited 2018-10-13 14:28 UTC
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RE: Unawareness
By dionicio on 2018-10-13 14:31:41
Suggesting security core to take charge of awareness functions. (NOT, only, or always).

Edited 2018-10-13 14:41 UTC
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RE[3]: Comment by flanque
By dionicio on 2018-10-13 14:37:03
All extremelly efficient. At not doing. Main job of a CEO is finding the way to the eye of the storm.
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