alt Hacker NewsI'd bet for the null hypothesis: the memory behaviour changes would hold if the core count was kept constant and only the VM's memory size was adjusted.
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dmitrygr • yesterday at 3:25 PM
There is a per-cpu data structure in the xnu kernel, but it is not big enough to tilt the scales when you are talking about RAM in units of gigabytes.
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Agreed. This is the OS adapting to available memory.
Similarly if you started with 4GB and there was 900MB available for user apps, I expect you could launch apps that consume 1500MB just fine; the OS is leaving enough to launch anything, and making use of unused memory for cache/etc.