I've seen similar results on big compile jobs, no acceleration. Need to test myself sometime.
Well, you could have some sort of big.LITTLE arrangement so that make runs blazing fast when only <=N files have changed for some small N... :-)
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There's a lot of criticism of the big.LITTLE approach, with many feeling it's still just better having a faster core getting work done sooner being able to sleep longer.
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The weaker cores are usually a substantially more efficient design, not just lower clocked variants of the main cores. Battery life is much better with all the big cores disabled than all LITTLE ones and devices with only those more efficient cores get much better battery life.
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Qualcomm 845 uses 4x modified Cortex-A75 (https://en.wikipedia.org/wiki/ARM_Cortex-A75 …) and 4x modified Cortex-A55 which are in-order (https://en.wikipedia.org/wiki/ARM_Cortex-A55 …). It works quite well with the current energy aware scheduler implementation. It would be terrible with the mainline Linux kernel scheduler.
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