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How does macOS manage virtual cores on Apple silicon?
(eclecticlight.co)
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this post was submitted on 23 Oct 2023
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Just want to point out that this is far from unique to apple. Lots of Arm processors have this. I think my first phone that had it was the OnePlus 2, which launched in 2015.
I would honestly be surprised if any major smartphone didn't have this.
It's worth noting that Apple's partnership with ARM goes back to the 1980's and included both resources and people all the way back to then (from memory I think the first CEO of ARM was an Apple employee). Your OnePlus 2 has efficiency cores because of Apple's investment in that architecture.
But this article is about Macs, not phones. Some Apple Silicon Macs would only last about 2 minutes if they ran on the battery in your OnePlus 2, and the "efficiency cores" aren't really there to reduce power consumption... it's more about producing less heat.
For example the M2 cores are more than capable of running high end PC games, and because they generate almost no heat at all even under full load you can push the GPU much harder than you could if the performance cores were active. Your entire cooling system only needs to keep the GPU cool.
I'm consistently impressed with how relatively cool my M2 Air stays when I'm playing No Man's Sky. I was expecting the game to be throttled to death, but I never see any real performance drops, while still being able to play it on my lap.
Yeah I was going to say, this is far from Apple Silicon’s distinctive feature, let alone an “Apple” thing.
Also most modern x86 desktop CPUs have this too.
As far as I know not to the same degree? For example I'm pretty sure Apple's efficiency cores don't do speculative execution or at least don't do much of it.
AFAIK the x86 chips mostly just reduce the clock speed don't they?
x86-64 doesn’t need efficiency cores because unlike ARM, it doesn’t care about limiting power draw.
ARM’s main appeal has always been ability to compute with minimal current (I think the first ARM processor consumed no power).
Now that would be some efficiency aight.
I recall something about operating on leak current alone, which is probability where you got that from.
Don't try this at home. You could cause an infinitly powered electro-black-hole.
@Skelectus @ultratiem yes, that happened. It first worked on residual energy from the board it was on. It was a funny accident actually. They forgot to turn on the power supply, but it was working.
That can't be quite right either, as it would be eaten immediately.
I looked it up, most specific I could find is this quote:
Not sure how accurate this is, but the power has to originate from something that is actively powered.