_O_n_l_i_n_e _M_a_n_u_a_l User Commands vmstat(1) NNNNAAAAMMMMEEEE vmstat - report statistics on system activity SSSSYYYYNNNNTTTTAAAAXXXX vvvvmmmmssssttttaaaatttt [ _p_u_n_a_m_e ] [ ----SSSSffffmmmmsssstttt ] [ _i_n_t_e_r_v_a_l [ _c_o_u_n_t ] ] DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN By default, _v_m_s_t_a_t prints iterative statistics for: processes, memory usage, traps, disk activity, and cpu usage. _p_u_n_a_m_e Specifies an alphnumeric name of a PU on the sys- tem. ----SSSS Print swapped-process information instead of page reclaims (``re'') and cache hits on freed pages (``at'') in default. ----ffff Reports on the number of _f_o_r_ks and _v_f_o_r_ks since system startup and the number of pages of virtual memory involved in each kind of fork. ----mmmm Prints statistics on memory usage and swap volume. ----ssss Prints statistics on swapping and paging (the con- tents of the sum structure) since the system boot. ----tttt Prints time statistics in milliseconds and microseconds for page reclaims and for page ins. iiiinnnntttteeeerrrrvvvvaaaallll Specifies in seconds the reporting interval. For example, vmstat 5 prints system statistics every 5 seconds, which is the sampling interval for some statistics. Other samplings occur every second (as shown by running the output for a while). ccccoooouuuunnnntttt Specifies the number of times to repeat printing the statistics. FFFFoooorrrrmmmmaaaatttt FFFFiiiieeeellllddddssss Procs: information about numbers of processes in various states. r in the ``run queue'' b blocked for resources (I/O, paging, and others.) w runnable or ``short sleeper'' (that is, < 20 secs) but swapped Memory: information about the usage of virtual and real memory. Virtual pages are considered active if associated with processes that are running or have run in the last 20 seconds. Pagesize is 4096 bytes. avm active virtual pages fre size of the free list re number of unshared page reclaims, where the page was ``stolen'' by the page- replacement algorithm and reclaimed due to page fault (before reuse) at number of cache hits on text pages that were freed (by _e_x_e_c or _e_x_i_t for example) and ``hit'' by a new process Page: information about page faults and paging activity. These are averaged each five seconds, and given in units per second. si swapp-in processes so swapped-out processes pi paged-in pages po paged-out pages fr pages freed-per-second by the page-replacement (clock) algorithm de short-term memory requirements to swap in jobs sr pages scanned-per-second by the page-replacement (clock) algorithm 10/11/20/21: Disk operations per second on disk units 0 to 3. Faults: trap/interrupt rate averages per second over last 5 seconds. in (nonclock) device interrupts per second sy system calls per second cs cpu context-switch rate (switches/second) Cpu: breakdown of percentage usage of CPU time us user time for normal- and low-priority processes sy system time id cpu idle OOOOppppttttiiiioooonnnnaaaallll SSSSttttaaaattttiiiissssttttiiiiccccssss This information is subject to change. ----SSSS option This option produces the default data except for swapped- page information instead of the page reclaims (``re'') and cache hits on freed pages (``at''). ----ffff option [value] forks, [value] pages, average=[value] [value] vforks, [value] pages, average=[value] ----mmmm option (intended for internal system maintenance only) Memory usage: [value] 4k pages free real memory [value] 4k pages virtual memory [value] 4k pages unshared real memory [value] 4k pages text real memory [value] 4k pages system wired-down memory [value] 4k pages system pmemall'ed memory [value] 4k pages u.area memory [value] 4k pages page table memory Swap traffic: [value] curr/[value] max command-block waiters [value] curr/[value] max concurrent async page pushes [value] curr/[value] max concurrent swap-volume I/Os [value] incidences of swap volume I/O saturation [value] curr/[value] max swap-buffer headers in use [value] incidences of swap-buffer headers unavailable ----ssss option: [value] cpu context switches [value] traps [value] system calls [value] RPU interrupts [value] tlbmiss (excl. utlbmiss) [value] tlbmiss in kernel (excl. kpte window) [value] pages swapped in [value] pages swapped out [value] page ins [value] page outs [value] pages paged in [value] pages paged out [value] intransit blocking page faults [value] total reclaims [value] swap text pages found in free list [value] inode text pages found in free list [value] executable fill page faults [value] zero fill page faults [value] shared-memory page faults [value] executable fill pages created [value] zero fill pages created [value] shared-memory pages created [value] reclaims from free list [value] total address trans. faults taken [value] pages examined by the clock daemon [value] revolutions of the clock hand [value] sequential process pages freed [value] pages freed by the clock daemon [value] swap ins [value] swap outs ----tttt option: (these statistics are displayed as 0, since they are not normally gathered by the system) 3713 reclaims, 0 total time (usec) average: 0 usec / reclaim 1167 page ins, 0 total time (msec) average: 0.0 msec / page in SSSSEEEEEEEE AAAALLLLSSSSOOOO User Commands (1): ps, diskstat March 1989 TX User's Reference