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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] [-l] [-a] <command> | ||
12 | 'perf stat' [-e <EVENT> | --event=EVENT] [-l] [-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 | --inherit:: | ||
35 | child tasks inherit counters | ||
36 | -p:: | ||
37 | --pid=<pid>:: | ||
38 | stat events on existing pid | ||
39 | |||
40 | -a:: | ||
41 | system-wide collection | ||
42 | |||
43 | -l:: | ||
44 | scale counter values | ||
45 | |||
46 | EXAMPLES | ||
47 | -------- | ||
48 | |||
49 | $ perf stat -- make -j | ||
50 | |||
51 | Performance counter stats for 'make -j': | ||
52 | |||
53 | 8117.370256 task clock ticks # 11.281 CPU utilization factor | ||
54 | 678 context switches # 0.000 M/sec | ||
55 | 133 CPU migrations # 0.000 M/sec | ||
56 | 235724 pagefaults # 0.029 M/sec | ||
57 | 24821162526 CPU cycles # 3057.784 M/sec | ||
58 | 18687303457 instructions # 2302.138 M/sec | ||
59 | 172158895 cache references # 21.209 M/sec | ||
60 | 27075259 cache misses # 3.335 M/sec | ||
61 | |||
62 | Wall-clock time elapsed: 719.554352 msecs | ||
63 | |||
64 | SEE ALSO | ||
65 | -------- | ||
66 | linkperf:perf-top[1], linkperf:perf-list[1] | ||