PERF-STAT(1) perf Manual PERF-STAT(1)NAMEperf-stat - Run a command and gather performance counter statistics
SYNOPSIS
perf stat [-e <EVENT> | --event=EVENT] [-a] <command>
perf stat [-e <EVENT> | --event=EVENT] [-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, --no-inherit
child tasks do not inherit counters
-p, --pid=<pid>
stat events on existing process id (comma separated list)
-t, --tid=<tid>
stat events on existing thread id (comma separated list)
-a, --all-cpus
system-wide collection from all CPUs
-c, --scale
scale/normalize counter values
-r, --repeat=<n>
repeat command and print average + stddev (max: 100)
-B, --big-num
print large numbers with thousands' separators according to locale
-C, --cpu=
Count only on the list of CPUs provided. Multiple CPUs can be
provided as a comma-separated list with no space: 0,1. Ranges of
CPUs are specified with -: 0-2. In per-thread mode, this option is
ignored. The -a option is still necessary to activate system-wide
monitoring. Default is to count on all CPUs.
-A, --no-aggr
Do not aggregate counts across all monitored CPUs in system-wide
mode (-a). This option is only valid in system-wide mode.
-n, --null
null run - don’t start any counters
-v, --verbose
be more verbose (show counter open errors, etc)
-x SEP, --field-separator SEP
print counts using a CSV-style output to make it easy to import
directly into spreadsheets. Columns are separated by the string
specified in SEP.
-G name, --cgroup name
monitor only in the container (cgroup) called "name". This option
is available only in per-cpu mode. The cgroup filesystem must be
mounted. All threads belonging to container "name" are monitored
when they run on the monitored CPUs. Multiple cgroups can be
provided. Each cgroup is applied to the corresponding event, i.e.,
first cgroup to first event, second cgroup to second event and so
on. It is possible to provide an empty cgroup (monitor all the
time) using, e.g., -G foo,,bar. Cgroups must have corresponding
events, i.e., they always refer to events defined earlier on the
command line.
-o file, --output file
Print the output into the designated file.
--append
Append to the output file designated with the -o option. Ignored if
-o is not specified.
--log-fd
Log output to fd, instead of stderr. Complementary to --output, and
mutually exclusive with it. --append may be used here. Examples:
3>results perf stat --log-fd 3 — $cmd 3>>results perf stat
--log-fd 3 --append — $cmd
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 ALSOperf-top(1), perf-list(1)perf 3.6.11-4.fc16.x8 01/08/2013 PERF-STAT(1)
