Pointers Are More Abstract Than You Might Expect in C

Re:Pointers Are More Abstract Than You Might Expect in C by tomp on Monday July 02, 2018 @08:26AM (#17441052)

> memory doesn't work like a simple flat address space

Can you expand on that? I thought that modern (non-segmented) memory does work like a simple flat address space, at least from the perspective of userspace programs. Isn't all the weirdness only a result of compiler optimisations?

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Re:Pointers Are More Abstract Than You Might Expect in C by thechao on Monday July 02, 2018 @09:31AM (#17441446)

Just to take one example: multisocket x86 is NUMA. There’s HW to paper over that fact, but the power/perf cost is quite high.

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Re:Pointers Are More Abstract Than You Might Expect in C by mastax on Monday July 02, 2018 @10:29AM (#17441915)

Also Epyc and (even more so) Threadripper have somewhat NUMA memory access in a single CPU.

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