vmstat.d(1m)

NAME
vmstat.d - vmstat demo in DTrace. Uses DTrace.

SYNOPSIS
vmstat.d

DESCRIPTION
This has been written to demonstrate fetching the same data as vmstat from DTrace. This program is intended as a starting point for other DTrace scripts, by beginning with familiar statistics. Since this uses DTrace, only the root user or users with the dtrace_kernel privilege can run this command.

EXAMPLES

Print virtual memory statistics every second,
    # vmstat.d

FIELDS

w   swapped out light weight processes

swap
    virtual memory free, Kbytes

free
    free RAM, Kbytes

re  page reclaims, Kbytes

mf  minor faults, Kbytes

pi  page ins, Kbytes

po  page outs, Kbytes

fr  pages freed, Kbytes

sr  scan rate, pages

in  interrupts, number

sy  system calls, number

cs  context switches, number

NOTES
Most of the statistics are in units of kilobytes, unlike the original vmstat command which sometimes uses page counts. As this program does not use Kstat, there is no summary since boot line. Free RAM is both free free + cache free.

DOCUMENTATION
See the DTraceToolkit for further documentation under the Docs directory. The DTraceToolkit docs may include full worked examples with verbose descriptions explaining the output.

EXIT
vmstat.d will run until Ctrl-C is hit.

AUTHOR
Brendan Gregg [Sydney, Australia]

SEE ALSO
vmstat(1M), dtrace(1M)