| perf-stat(1) |
| ============ |
| |
| NAME |
| ---- |
| perf-stat - Run a command and gather performance counter statistics |
| |
| SYNOPSIS |
| -------- |
| [verse] |
| 'perf stat' [-e <EVENT> | --event=EVENT] [-S] [-a] <command> |
| 'perf stat' [-e <EVENT> | --event=EVENT] [-S] [-a] -- <command> [<options>] |
| |
| DESCRIPTION |
| ----------- |
| This command runs a command and gathers performance counter statistics |
| from it. |
| |
| |
| OPTIONS |
| ------- |
| <command>...:: |
| Any command you can specify in a shell. |
| |
| |
| -e:: |
| --event=:: |
| Select the PMU event. Selection can be a symbolic event name |
| (use 'perf list' to list all events) or a raw PMU |
| event (eventsel+umask) in the form of rNNN where NNN is a |
| hexadecimal event descriptor. |
| |
| -i:: |
| --inherit:: |
| child tasks inherit counters |
| -p:: |
| --pid=<pid>:: |
| stat events on existing pid |
| |
| -a:: |
| system-wide collection |
| |
| -c:: |
| scale counter values |
| |
| EXAMPLES |
| -------- |
| |
| $ perf stat -- make -j |
| |
| Performance counter stats for 'make -j': |
| |
| 8117.370256 task clock ticks # 11.281 CPU utilization factor |
| 678 context switches # 0.000 M/sec |
| 133 CPU migrations # 0.000 M/sec |
| 235724 pagefaults # 0.029 M/sec |
| 24821162526 CPU cycles # 3057.784 M/sec |
| 18687303457 instructions # 2302.138 M/sec |
| 172158895 cache references # 21.209 M/sec |
| 27075259 cache misses # 3.335 M/sec |
| |
| Wall-clock time elapsed: 719.554352 msecs |
| |
| SEE ALSO |
| -------- |
| linkperf:perf-top[1], linkperf:perf-list[1] |