Manual Pages for UNIX Operating System command usage for man vmstat

System Administration Commands                         vmstat(1M)



NAME
     vmstat - report virtual memory statistics

SYNOPSIS
     vmstat [-ipqsS] [-T u | d] [disks] [interval [count]]


DESCRIPTION
     vmstat reports virtual memory  statistics  regarding  kernel
     thread, virtual memory, disk, trap, and CPU activity.


     On MP (multi-processor) systems, vmstat averages the  number
     of  CPUs  into the output. For per-processor statistics, see
     mpstat(1M).


     vmstat only supports statistics  for  certain  devices.  For
     more  general  system statistics, use sar(1), iostat(1M), or
     sar(1M).


     Without options, vmstat displays a one-line summary  of  the
     virtual memory activity since the system was booted.


     During execution of the kernel status command, the state  of
     the  system  can change. If relevant, a state change message
     is included in the vmstat output, in one  of  the  following
     forms:

       <>
       <>
       <>
       <>




     See  for device naming conventions for disks.

OPTIONS
     The following options are supported:

     -i          Report the  number  of  interrupts  per  device.
                 count  and  interval  does  not  apply to the -i
                 option.


     -p          Report paging activity in details.  This  option
                 will display the following, respectively:




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System Administration Commands                         vmstat(1M)



                 epi    Executable page-ins.


                 epo    Executable page-outs.


                 epf    Executable page-frees.


                 api    Anonymous page-ins.


                 apo    Anonymous page-outs.


                 apf    Anonymous page-frees.


                 fpi    File system page-ins.


                 fpo    File system page-outs.


                 fpf    File system page-frees.

                 When executed in a zone and if the pools  facil-
                 ity  is  active,  all  of  the above only report
                 actitivity on the processors  in  the  processor
                 set of the zone's pool.


     -q          Suppress messages related to state changes.


     -s          Display  the  total  number  of  various  system
                 events  since  boot. count and interval does not
                 apply to the -s option.


     -S          Report on swapping rather than paging  activity.
                 This  option  will change two fields in vmstat's
                 ``paging'' display: rather than the  ``re''  and
                 ``mf''  fields, vmstat will report ``si'' (swap-
                 ins) and ``so'' (swap-outs).


     -T u | d    Specify u for a printed  representation  of  the
                 internal  representation  of  time. See time(2).
                 Specify d for standard date format. See date(1).





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System Administration Commands                         vmstat(1M)



OPERANDS
     The following operands are supported:

     count       Specifies the number of times that  the  statis-
                 tics  are  repeated. count does not apply to the
                 -i and -s options.


     disks       Specifies which disks are to be  given  priority
                 in  the  output (only four disks fit on a line).
                 Common disk names are id, sd, xd,  or  xy,  fol-
                 lowed by a number (for example, sd2, xd0, and so
                 forth).


     interval    Specifies the last number of seconds over  which
                 vmstat   summarizes  activity.  This  number  of
                 seconds repeats forever. interval does not apply
                 to the -i and -s options.


EXAMPLES
     Example 1 Using vmstat


     The following command displays a summary of what the  system
     is doing every five seconds.


       example% vmstat 5


       kthr   memory          page             disk      faults        cpu
       r b w swap  free re mf pi p fr de sr s0 s1 s2 s3  in  sy  cs us sy id
       0 0 0 11456 4120 1  41 19 1  3  0  2  0  4  0  0  48 112 130  4 14 82
       0 0 1 10132 4280 0   4 44 0  0  0  0  0 23  0  0 211 230 144  3 35 62
       0 0 1 10132 4616 0   0 20 0  0  0  0  0 19  0  0 150 172 146  3 33 64
       0 0 1 10132 5292 0   0  9 0  0  0  0  0 21  0  0 165 105 130  1 21 78
       1 1 1 10132 5496 0   0  5 0  0  0  0  0 23  0  0 183  92 134  1 20 79
       1 0 1 10132 5564 0   0 25 0  0  0  0  0 18  0  0 131 231 116  4 34 62
       1 0 1 10124 5412 0   0 37 0  0  0  0  0 22  0  0 166 179 118  1 33 67
       1 0 1 10124 5236 0   0 24 0  0  0  0  0 14  0  0 109 243 113  4 56 39
       ^C

       example%




     The fields of vmstat's display are





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System Administration Commands                         vmstat(1M)



     kthr      Report the number of kernel threads in each of the
               three following states:

               r    the number of kernel threads in run queue


               b    the number of blocked kernel threads that are
                    waiting  for  resources  I/O,  paging, and so
                    forth


               w    the  number  of   swapped   out   lightweight
                    processes  (LWPs)  that  are waiting for pro-
                    cessing resources to finish.



     memory    Report on usage of virtual and real memory.

               swap    available swap space (Kbytes)


               free    size of the free list (Kbytes)



     page      Report information about page  faults  and  paging
               activity. The information on each of the following
               activities is given in units per second.

               re    page reclaims - but see the  -S  option  for
                     how this field is modified.


               mf    minor faults - but see the -S option for how
                     this field is modified.


               pi    kilobytes paged in


               po    kilobytes paged out


               fr    kilobytes freed


               de    anticipated  short-term   memory   shortfall
                     (Kbytes)






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System Administration Commands                         vmstat(1M)



               sr    pages scanned by clock algorithm

               When executed in a zone and if the pools  facility
               is active, all of the above (except for "de") only
               report activity on the processors in the processor
               set of the zone's pool.


     disk      Report the number of disk operations  per  second.
               There are slots for up to four disks, labeled with
               a single letter and number. The  letter  indicates
               the  type  of  disk  (s  =  SCSI,  i = IPI, and so
               forth); the number is the logical unit number.


     faults    Report the trap/interrupt rates (per second).

               in    interrupts


               sy    system calls


               cs    CPU context switches

               When executed in a zone and if the pools  facility
               is active, all of the above only report actitivity
               on the processors in  the  processor  set  of  the
               zone's pool.


     cpu       Give a breakdown of percentage usage of CPU  time.
               On  MP systems, this is an average across all pro-
               cessors.

               us    user time


               sy    system time


               id    idle time

               When executed in a zone and if the pools  facility
               is active, all of the above only report actitivity
               on the processors in  the  processor  set  of  the
               zone's pool.


ATTRIBUTES
     See attributes(5) for descriptions of the  following  attri-
     butes:



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System Administration Commands                         vmstat(1M)



     ____________________________________________________________
    |       ATTRIBUTE TYPE        |       ATTRIBUTE VALUE       |
    |_____________________________|_____________________________|
    | Availability                | SUNWcs                      |
    |_____________________________|_____________________________|
    | Interface Stability         | See below.                  |
    |_____________________________|_____________________________|



     Invocation is evolving. Human readable output is unstable.

SEE ALSO
     date(1), sar(1), iostat(1M), mpstat(1M),  sar(1M),  time(2),
     attributes(5)

NOTES
     The sum of CPU utilization  might  vary  slightly  from  100
     because of rounding errors in the production of a percentage
     figure.



































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