1 perf-stat(1) 2 ============ 3 4 NAME 5 ---- 6 perf-stat - Run a command and gather performance counter statistics 7 8 SYNOPSIS 9 -------- 10 [verse] 11 'perf stat' [-e <EVENT> | --event=EVENT] [-a] <command> 12 'perf stat' [-e <EVENT> | --event=EVENT] [-a] -- <command> [<options>] 13 14 DESCRIPTION 15 ----------- 16 This command runs a command and gathers performance counter statistics 17 from it. 18 19 20 OPTIONS 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=:: 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. 67 68 -A:: 69 --no-aggr:: 70 Do not aggregate counts across all monitored CPUs in system-wide mode (-a). 71 This 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:: 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. 85 86 -G name:: 87 --cgroup name:: 88 monitor only in the container (cgroup) called "name". This option is available only 89 in per-cpu mode. The cgroup filesystem must be mounted. All threads belonging to 90 container "name" are monitored when they run on the monitored CPUs. Multiple cgroups 91 can be provided. Each cgroup is applied to the corresponding event, i.e., first cgroup 92 to first event, second cgroup to second event and so on. It is possible to provide 93 an empty cgroup (monitor all the time) using, e.g., -G foo,,bar. Cgroups must have 94 corresponding events, i.e., they always refer to events defined earlier on the command 95 line. 96 97 EXAMPLES 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 114 115 SEE ALSO 116 -------- 117 linkperf:perf-top[1], linkperf:perf-list[1] 118
