VM_STAT(1) BSD General Commands Manual VM_STAT(1)NAMEvm_stat — show Mach virtual memory statistics
SYNOPSISvm_stat [[-c count] interval]
DESCRIPTIONvm_stat displays Mach virtual memory statistics. If the optional
interval is specified, then vm_stat will display the statistics every
interval seconds. In this case, each line of output displays the change
in each statistic (an interval count of 1 displays the values per sec‐
ond). However, the first line of output following each banner displays
the system-wide totals for each statistic. If a count is provided, the
command will terminate after count intervals. The following values are
displayed:
Pages free
the total number of free pages in the system.
Pages active
the total number of pages currently in use and pageable.
Pages inactive
the total number of pages on the inactive list.
Pages speculative
the total number of pages on the speculative list.
Pages throttled
the total number of pages on the throttled list (not wired but
not pageable).
Pages wired down
the total number of pages wired down. That is, pages that cannot
be paged out.
Pages purgeable
the total number of purgeable pages.
Translation faults
the number of times the "vm_fault" routine has been called.
Pages copy-on-write
the number of faults that caused a page to be copied (generally
caused by copy-on-write faults).
Pages zero filled
the total number of pages that have been zero-filled on demand.
Pages reactivated
the total number of pages that have been moved from the inactive
list to the active list (reactivated).
Pages purged
the total number of pages that have been purged.
File-backed pages
the total number of pages that are file-backed (non-swap)
Anonymous pages
the total number of pages that are anonymous
Uncompressed pages
the total number of pages (uncompressed) held within the compres‐
sor
Pages used by VM compressor:
the number of pages used to store compressed VM pages.
Pages decompressed
the total number of pages that have been decompressed by the VM
compressor.
Pages compressed
the total number of pages that have been compressed by the VM
compressor.
Pageins
the total number of requests for pages from a pager (such as the
inode pager).
Pageouts
the total number of pages that have been paged out.
Swapins
the total number of compressed pages that have been swapped out
to disk.
Swapouts
the total number of compressed pages that have been swapped back
in from disk.
If interval is not specified, then vm_stat displays all accumulated sta‐
tistics along with the page size.
Mac OS X August 13, 1997 Mac OS X
