Available megabytes implied by a block of vm_stat output

Inactive and speculative pages are reclaimed on demand, so they count as available to an allocation in the same sense as Linux's MemAvailable; macOS keeps almost nothing on the free list, so the free count alone understates what a large matrix can actually obtain.

Usage

vm_stat_available_mb(vm, page_size)

Arguments

vm

Character vector of vm_stat output lines.

page_size

Page size in bytes, as returned by vm_stat_page_size().

Value

Numeric scalar (MB available), or NA_real_ if unparseable.

Details

Split from get_free_ram_mb() so the page-size and page-class handling can be checked without a macOS host.