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Memory normally refers to RAM. Temporary, high-speed storage used to keep frequently accessed information available for use and helps keep the computer running smoothly
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What scale or measure does Mavericks' and Yosemite's "memory pressure" adhere to?
Memory pressure is defined by two counters Mach keeps internally:
vm_page_free_count: How many pages of RAM are presently free
vm_page_free_target: How many pages of RAM, at a minimum, should optimally …