6 perf-stat - Run a command and gather performance counter statistics
11 'perf stat' [-e <EVENT> | --event=EVENT] [-a] <command>
12 'perf stat' [-e <EVENT> | --event=EVENT] [-a] -- <command> [<options>]
16 This command runs a command and gathers performance counter statistics
23 Any command you can specify in a shell.
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.
35 child tasks do not inherit counters
38 stat events on existing process id
42 stat events on existing thread id
47 system-wide collection from all CPUs
51 scale/normalize counter values
55 repeat command and print average + stddev (max: 100)
59 print large numbers with thousands' separators according to locale
63 Count only on the list of CPUs provided. Multiple CPUs can be provided as a
64 comma-separated list with no space: 0,1. Ranges of CPUs are specified with -: 0-2.
65 In per-thread mode, this option is ignored. The -a option is still necessary
66 to activate system-wide monitoring. Default is to count on all CPUs.
70 Do not aggregate counts across all monitored CPUs in system-wide mode (-a).
71 This option is only valid in system-wide mode.
75 null run - don't start any counters
79 be more verbose (show counter open errors, etc)
82 --field-separator SEP::
83 print counts using a CSV-style output to make it easy to import directly into
84 spreadsheets. Columns are separated by the string specified in SEP.
89 $ perf stat -- make -j
91 Performance counter stats for 'make -j':
93 8117.370256 task clock ticks # 11.281 CPU utilization factor
94 678 context switches # 0.000 M/sec
95 133 CPU migrations # 0.000 M/sec
96 235724 pagefaults # 0.029 M/sec
97 24821162526 CPU cycles # 3057.784 M/sec
98 18687303457 instructions # 2302.138 M/sec
99 172158895 cache references # 21.209 M/sec
100 27075259 cache misses # 3.335 M/sec
102 Wall-clock time elapsed: 719.554352 msecs
106 linkperf:perf-top[1], linkperf:perf-list[1]