linux/tools/perf/Documentation/perf-stat.txt
<<
>>
Prefs
   1perf-stat(1)
   2============
   3
   4NAME
   5----
   6perf-stat - Run a command and gather performance counter statistics
   7
   8SYNOPSIS
   9--------
  10[verse]
  11'perf stat' [-e <EVENT> | --event=EVENT] [-a] <command>
  12'perf stat' [-e <EVENT> | --event=EVENT] [-a] -- <command> [<options>]
  13
  14DESCRIPTION
  15-----------
  16This command runs a command and gathers performance counter statistics
  17from it.
  18
  19
  20OPTIONS
  21-------
  22<command>...::
  23        Any command you can specify in a shell.
  24
  25
  26-e::
  27--event=::
  28        Select the PMU event. Selection can be a symbolic event name
  29        (use 'perf list' to list all events) or a raw PMU
  30        event (eventsel+umask) in the form of rNNN where NNN is a
  31         hexadecimal event descriptor.
  32
  33-i::
  34--no-inherit::
  35        child tasks do not inherit counters
  36-p::
  37--pid=<pid>::
  38        stat events on existing process id
  39
  40-t::
  41--tid=<tid>::
  42        stat events on existing thread id
  43
  44
  45-a::
  46--all-cpus::
  47        system-wide collection from all CPUs
  48
  49-c::
  50--scale::
  51        scale/normalize counter values
  52
  53-r::
  54--repeat=<n>::
  55        repeat command and print average + stddev (max: 100)
  56
  57-B::
  58--big-num::
  59        print large numbers with thousands' separators according to locale
  60
  61-C::
  62--cpu=::
  63Count only on the list of CPUs provided. Multiple CPUs can be provided as a
  64comma-separated list with no space: 0,1. Ranges of CPUs are specified with -: 0-2.
  65In per-thread mode, this option is ignored. The -a option is still necessary
  66to activate system-wide monitoring. Default is to count on all CPUs.
  67
  68-A::
  69--no-aggr::
  70Do not aggregate counts across all monitored CPUs in system-wide mode (-a).
  71This option is only valid in system-wide mode.
  72
  73-n::
  74--null::
  75        null run - don't start any counters
  76
  77-v::
  78--verbose::
  79        be more verbose (show counter open errors, etc)
  80
  81-x SEP::
  82--field-separator SEP::
  83print counts using a CSV-style output to make it easy to import directly into
  84spreadsheets. Columns are separated by the string specified in SEP.
  85
  86-G name::
  87--cgroup name::
  88monitor only in the container (cgroup) called "name". This option is available only
  89in per-cpu mode. The cgroup filesystem must be mounted. All threads belonging to
  90container "name" are monitored when they run on the monitored CPUs. Multiple cgroups
  91can be provided. Each cgroup is applied to the corresponding event, i.e., first cgroup
  92to first event, second cgroup to second event and so on. It is possible to provide
  93an empty cgroup (monitor all the time) using, e.g., -G foo,,bar. Cgroups must have
  94corresponding events, i.e., they always refer to events defined earlier on the command
  95line.
  96
  97EXAMPLES
  98--------
  99
 100$ perf stat -- make -j
 101
 102 Performance counter stats for 'make -j':
 103
 104    8117.370256  task clock ticks     #      11.281 CPU utilization factor
 105            678  context switches     #       0.000 M/sec
 106            133  CPU migrations       #       0.000 M/sec
 107         235724  pagefaults           #       0.029 M/sec
 108    24821162526  CPU cycles           #    3057.784 M/sec
 109    18687303457  instructions         #    2302.138 M/sec
 110      172158895  cache references     #      21.209 M/sec
 111       27075259  cache misses         #       3.335 M/sec
 112
 113 Wall-clock time elapsed:   719.554352 msecs
 114
 115SEE ALSO
 116--------
 117linkperf:perf-top[1], linkperf:perf-list[1]
 118