perf_2.6.32-stat1
Run a command and gather performance counter statistics
Usage
perf stat
[{-e
<EVENT> | --event=EVENT}]
[-S]
[-a]
<command>
perf stat
[{-e
<EVENT> | --event=EVENT}]
[-S]
[-a]
—
<command>
[<options>]
Overview
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