SYSTAT(1) General Commands Manual SYSTAT(1)
systat - display system statistics
systat [-aBbiNn] [-d count] [-s delay] [-w width] [view] [delay]
systat displays various system statistics in a screen-oriented fashion
using the curses(3) screen display library.
While systat is running, the screen is divided into different areas. The
top line displays the current number of users, the three system load
average figures over the last 1, 5, and 15 minute intervals, and the
system time. The bottom line of the screen is reserved for user input
and error messages. The information displayed in the rest of the screen
comprises a view, and is the main interface for displaying different
types of system statistics. The vmstat view is the default.
Certain information may be discarded when the screen size is insufficient
for display. For example, on a machine with 10 drives the iostat bar
graph displays only 3 drives on a 24 line terminal.
The options are as follows:
-a Display all lines.
-B Raw, non-interactive mode. The default is to exit after two
screen updates, with statistics only ever displayed once. Useful
for views such as cpu, where initial calculations are useless.
-b Raw, non-interactive mode. The default is to exit after one
screen update, with statistics displayed every update.
Exit after count screen updates.
-i Interactive mode.
-N Resolve network addresses to names. This is the opposite of the
-n Do not try to reverse map IP addresses. This is the default.
Specifies the screen refresh time interval in seconds. This
option is overridden by the final delay argument, if given. The
default interval is 5 seconds.
Specifies the maximum width of the output in raw, non-interactive
view The view argument expects to be one of: vmstat, pigs, ifstat,
iostat, sensors, mbufs, netstat, swap, states, rules, queues, pf,
pool, pcache, malloc, buckets, nfsclient, nfsserver, cpu, or uvm.
These displays can also be requested interactively and are
described in full detail below. view may be abbreviated to the
minimum unambiguous prefix; for example, "io" for "iostat".
delay The delay argument specifies the screen refresh time interval in
seconds. This is provided for backwards compatibility, and
overrides any interval specified with the -s flag. The default
interval is 5 seconds.
Certain characters cause immediate action by systat. These are:
: Move the cursor to the command line and interpret the input
line typed as a command. While entering a command the
current character erase, word erase, and line kill characters
may be used.
o Select the next ordering which sorts the rows according to a
combination of columns. Available orderings depend on the
view. Not all views support orderings.
p Pause systat.
q Quit systat.
r Reverse the selected ordering if supported by the view.
, Print numbers with thousand separators, where applicable.
^A | <Home>
Jump to the beginning of the current view.
^B | <right arrow>
Select the previous view.
^E | <End> Jump to the end of the current view.
^F | <left arrow>
Select the next view.
^G Print the name of the current view being shown and the
^L Refresh the screen.
^N | <down arrow>
Scroll current view down by one line.
^P | <up arrow>
Scroll current view up by one line.
^V | <Page Down>
Scroll current view down by one page.
Alt-V | <Page Up>
Scroll current view up by one page.
^Z Suspend systat.
The following commands are interpreted by the "global" command
help Print the names of the available views on the command line.
order Print the names of the available orderings on the command
quit Quit systat. (This may be abbreviated to q.)
stop Stop refreshing the screen.
Start (continue) refreshing the screen. If a second,
numeric, argument is provided it is interpreted as a refresh
interval (in seconds). Supplying only a number will set the
refresh interval to this value.
view may be abbreviated to the minimum unambiguous prefix. The available
buckets Display kernel malloc(9) bucket statistics similar to the
output of vmstat -m.
cpu Display information about the average usage of each CPU,
similar to the output provided by top(1).
ifstat Display interface statistics. The "State" column has the
format up|dn[:U|D]. `up' and `dn' represent whether the
interface is up or down. `U' and `D' represent whether the
interface is connected or not; in the case of carp(4)
interfaces, whether the interface is in master or backup
The character B changes the counter view between bytes and
bits. Pressing b displays statistics as calculated from boot
time. r changes the counters to show their totals as
calculated between display refreshes. t changes the counters
to show the average per second over the display refresh
interval; this is the default.
iostat Display statistics about disk throughput. Statistics on disk
throughput show, for each drive, data transferred in bytes,
number of disk transactions performed, and time spent in disk
accesses (in fractions of a second).
malloc Display kernel malloc(9) type statistics similar to the
output of vmstat -m. Available orderings are: name, inuse,
memuse, and requests.
mbufs Display mbuf usage information from kernel pools and mbuf
cluster pool statistics of each network interface.
netstat Display network connections. Each address is displayed
numerically in the format "host:port". By default, network
servers awaiting requests are not displayed. It is also
possible to have addresses displayed symbolically, when
possible, and limit the display to a set of protocols (the
minimum unambiguous prefix may be supplied):
all Toggle the displaying of server processes
awaiting requests (this is the equivalent of
the -a flag to netstat(1)).
names Display network addresses symbolically.
numbers Display network addresses numerically.
reset Reset matching mechanisms to the default.
tcp | udp | other
Display only network connections using the
nfsclient Display statistics about NFS client activity. Output
resembles nfsstat -c.
nfsserver Display statistics about NFS server activity. Output
resembles nfsstat -s.
pf Display filter information about pf(4), similar to the output
of pfctl -s info option.
pigs Display those processes resident in main memory and getting
the largest portion of the processor. When less than 100% of
the processor is scheduled to user processes, the remaining
time is accounted to the "idle" process.
pool Display kernel pool(9) statistics similar to the output of
vmstat -m. Available orderings are: name, requests, size,
and number of pages.
By default only the statistics of active pools are displayed
but pressing A changes the view to show all of them.
pcache Display kernel pool(9) per CPU cache statistics. Ordering is
available on all columns.
queues Display statistics about the active queues, similar to the
output of pfctl -s queue.
rules Display pf rules statistics, similar to the output of pfctl
sensors Display the current values of available hardware sensors, in
a format similar to that of sysctl(8).
states Display pf states statistics, similar to the output of pfctl
-s states. Available orderings are: none, bytes, expiry,
packets, age, source address, source port, destination
address, destination port, rate, and peak columns.
swap Show information about swap space usage on all the swap areas
compiled into the kernel. The first column is the device
name of the partition. The next column is the total space
available in the partition. The Used column indicates the
total blocks used so far; the graph shows the percentage of
space in use on each partition. If there is more than one
swap partition in use, a total line is also shown. Areas
known to the kernel but not in use are shown as not
vmstat Take over the entire display and show a (rather crowded)
compendium of statistics related to virtual memory usage,
process scheduling, device interrupts, system name
translation caching, disk I/O, etc. This view is the
Below the top line are statistics on memory utilization. The
first row of the table reports memory usage only among active
processes, that is, processes that have run in the previous
twenty seconds. The second row reports on memory usage of
all processes. The first column reports on the amount of
physical memory claimed by processes. The second column
reports the same figure for virtual memory, that is, the
amount of memory that would be needed if all processes were
resident at the same time. Finally, the last column shows
the amount of physical memory on the free list.
Below the memory display is a list of the average number of
processes (over the last refresh interval) that are runnable
(`r'), in disk wait other than paging (`d'), sleeping (`s'),
and swapped out but desiring to run (`w'). Below the queue
length listing is a numerical listing and a bar graph showing
the amount of interrupt (shown as `|'), spinning (shown as
`@'), system (shown as `='), user plus nice (shown as `>'),
and idle time (shown as ` ').
To the right of the Proc display are statistics about Context
switches ("Csw"), Traps ("Trp"), Syscalls ("Sys"), Interrupts
("Int"), Soft interrupts ("Sof"), and Faults ("Flt") which
have occurred during the last refresh interval.
Below the CPU usage graph are statistics on name
translations. It lists the number of names translated in the
previous interval, the number and percentage of the
translations that were handled by the system wide name
translation cache, and the number and percentage of the
translations that were handled by the per process name
At the bottom left is the disk usage display. It reports the
number of seeks, transfers, number of kilobyte blocks
transferred per second averaged over the refresh period of
the display, and the time spent in disk accesses.
Under the date in the upper right hand quadrant are
statistics on paging and swapping activity. The first two
columns report the average number of pages brought in and out
per second over the last refresh interval due to page faults
and the paging daemon. The third and fourth columns report
the average number of pages brought in and out per second
over the last refresh interval due to swap requests initiated
by the scheduler. The first row of the display shows the
average number of disk transfers per second over the last
refresh interval. The second row of the display shows the
average number of pages transferred per second over the last
Running down the right hand side of the display is a
breakdown of the interrupts being handled by the system. At
the top of the list is the total interrupts per second over
the time interval. The rest of the column breaks down the
total on a device by device basis. Only devices that have
interrupted at least once since boot time are shown.
Below the Interrupts display are the average number of input
and output packets per second for all interfaces over the
last refresh interval.
Below the SWAPPING display and slightly to the left of the
Interrupts display is a list of virtual memory statistics.
The abbreviations are:
forks process forks
fkppw forks where parent waits
fksvm forks where vmspace is shared
pwait fault had to wait on a page
relck fault relock called
rlkok fault relock is successful
noram faults out of ram
ndcpy number of times fault clears "need copy"
fltcp number of times fault promotes with copy
zfod fault promotes with zerofill
cow number of times fault anon cow
fmin min number of free pages
ftarg target number of free pages
itarg target number of inactive pages
wired wired pages
pdfre pages daemon freed since boot
pdscn pages daemon scanned since boot
pzidl number of zeroed pages
kmape number of kernel map entries
uvm Display statistics relevant to the UVM subsystem. The
statistics are divided into eight groups.
npages pages managed by UVM
free free pages
active active pages
inactive freed pages that may be wanted back
paging pages in the process of being paged
wired wired pages
zeropages zero'd pages
reserve_pagedaemon pages reserved for pagedaemon
reserve_kernel pages reserved for kernel.
vnodepages pages used by vnode page cache
vtextpages pages used by vtext vnodes
faults page fault count
traps trap count
intrs interrupt count
swtch context switch count
softs software interrupt count
syscalls system calls
pageins pagein operation count
pgswapin pages swapped in
pgswapout pages swapped out
forks_ppwait forks where parent waits
forks_sharevm forks where vmspace is shared
pga_zerohit pagealloc found requested zero'd
pga_zeromiss pagealloc failed to obtain zero'd
fltnoram fault was out of ram
fltnoanon fault was out of anons
fltnoamap fault was out of amap chunks
fltpgwait fault had to wait on a page
fltpgrele fault found a released page
fltrelck fault relock called
fltrelckok fault relock was a success
fltanget fault got anon page
fltanretry fault retried an anon get
fltamcopy fault cleared "needs copy"
fltnamap fault mapped a neighbor anon page
fltnomap fault mapped a neighbor obj page
fltlget fault did a locked pgo_get
fltget fault did an unlocked get
flt_anon fault anon (case 1a)
flt_acow fault anon cow (case 1b)
flt_obj fault was on object page (2a)
flt_prcopy fault promotes with copy (2b)
flt_przero fault promotes with zerofill (2b)
freemin minimum number of free pages
freetarg target number of free pages
inactarg target number of inactive pages
wiredmax maximum number of wired pages
anonmin mininumu threshold for anon pages
vtextmin minimum threshold for vtext pages
vnodemin minimum threshold for vnode pages
anonminpct minimum percent anon pages
vtextminpct minimum percent vtext pages
vnodeminpct minimum percent vnode pages
nswapdev configured swap devices
swpages PAGE_SIZE'ed swap pages
swpginuse swap pages in use
swpgonly in use swap pages not in RAM
nswget fault called uvm_swap_get()
nanon total anon's
pdwoke times daemon woke up
pdrevs times daemon rev'd clock hand
pdswout times daemon called for swapout
pdfreed pages daemon freed since boot
pdscans pages daemon scanned since boot
pdanscan anonymous pages scanned by daemon
pdobscan object pages scanned by daemon
pdreact pages daemon reactivated since boot
pdbusy times daemon found a busy page
pdpageouts times daemon started a pageout
pdpending times daemon got a pending pagout
pddeact pages daemon deactivates
fpswtch FPU context switches
kmapent kernel map entries
pagesize size of a page, always a power of 2
pagemask page mask
pageshift page shift
/etc/hosts Host names.
/etc/pf.conf pf(4) configuration.
/etc/services Port names.
fstat(1), kill(1), netstat(1), nfsstat(1), ps(1), top(1), iostat(8),
pfctl(8), pstat(8), renice(8), sysctl(8), vmstat(8)
The systat program first appeared in 4.3BSD.
Certain displays presume a minimum of 80 characters per line. The vmstat
display looks out of place because it is (it was added in as a separate
display rather than created as a new program).
OpenBSD 6.4 July 25, 2018 OpenBSD 6.4
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