2009-04-20 21:52:29 +08:00
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perf-stat(1)
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2008-04-16 04:39:31 +08:00
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============
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2009-04-20 21:52:29 +08:00
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NAME
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----
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perf-stat - Run a command and gather performance counter statistics
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SYNOPSIS
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--------
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[verse]
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2009-06-23 04:52:39 +08:00
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'perf stat' [-e <EVENT> | --event=EVENT] [-S] [-a] <command>
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'perf stat' [-e <EVENT> | --event=EVENT] [-S] [-a] -- <command> [<options>]
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2009-04-20 21:52:29 +08:00
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DESCRIPTION
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-----------
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This command runs a command and gathers performance counter statistics
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from it.
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OPTIONS
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-------
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<command>...::
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Any command you can specify in a shell.
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2009-06-04 22:33:00 +08:00
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2009-04-20 21:52:29 +08:00
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-e::
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--event=::
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2009-06-06 20:56:33 +08:00
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Select the PMU event. Selection can be a symbolic event name
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(use 'perf list' to list all events) or a raw PMU
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event (eventsel+umask) in the form of rNNN where NNN is a
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hexadecimal event descriptor.
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2009-04-20 21:52:29 +08:00
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2009-06-04 22:33:00 +08:00
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-i::
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2010-05-12 16:40:01 +08:00
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--no-inherit::
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child tasks do not inherit counters
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2009-06-04 22:33:00 +08:00
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-p::
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--pid=<pid>::
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stat events on existing pid
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2009-04-20 21:52:29 +08:00
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-a::
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system-wide collection
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2009-08-07 16:18:39 +08:00
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-c::
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2009-04-20 21:52:29 +08:00
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scale counter values
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perf stat: add perf stat -B to pretty print large numbers
It is hard to read very large numbers so provide an option to perf stat
to separate thousands using a separator. The patch leverages the locale
support of stdio. You need to set your LC_NUMERIC appropriately, for
instance LC_NUMERIC=en_US.UTF8. You need to pass -B to activate this
feature. This way existing scripts parsing the output do not need to be
changed. Here is an example.
$ perf stat noploop 2
noploop for 2 seconds
Performance counter stats for 'noploop 2':
1998.347031 task-clock-msecs # 0.998 CPUs
61 context-switches # 0.000 M/sec
0 CPU-migrations # 0.000 M/sec
118 page-faults # 0.000 M/sec
4,138,410,900 cycles # 2070.917 M/sec (scaled from 70.01%)
2,062,650,268 instructions # 0.498 IPC (scaled from 70.01%)
2,057,653,466 branches # 1029.678 M/sec (scaled from 70.01%)
40,267 branch-misses # 0.002 % (scaled from 30.04%)
2,055,961,348 cache-references # 1028.831 M/sec (scaled from 30.03%)
53,725 cache-misses # 0.027 M/sec (scaled from 30.02%)
2.001393933 seconds time elapsed
$ perf stat -B noploop 2
noploop for 2 seconds
Performance counter stats for 'noploop 2':
1998.297883 task-clock-msecs # 0.998 CPUs
59 context-switches # 0.000 M/sec
0 CPU-migrations # 0.000 M/sec
119 page-faults # 0.000 M/sec
4,131,380,160 cycles # 2067.450 M/sec (scaled from 70.01%)
2,059,096,507 instructions # 0.498 IPC (scaled from 70.01%)
2,054,681,303 branches # 1028.216 M/sec (scaled from 70.01%)
25,650 branch-misses # 0.001 % (scaled from 30.05%)
2,056,283,014 cache-references # 1029.017 M/sec (scaled from 30.03%)
47,097 cache-misses # 0.024 M/sec (scaled from 30.02%)
2.001391016 seconds time elapsed
Cc: David S. Miller <davem@davemloft.net>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Tom Zanussi <tzanussi@gmail.com>
LKML-Reference: <4bf28fe8.914ed80a.01ca.fffff5f5@mx.google.com>
Signed-off-by: Stephane Eranian <eranian@google.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2010-05-18 21:00:01 +08:00
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-B::
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print large numbers with thousands' separators according to locale
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2009-04-20 21:52:29 +08:00
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EXAMPLES
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--------
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2009-06-04 22:33:00 +08:00
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$ perf stat -- make -j
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2009-04-20 21:52:29 +08:00
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2009-06-04 22:33:00 +08:00
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Performance counter stats for 'make -j':
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2009-04-20 21:52:29 +08:00
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2009-06-04 22:33:00 +08:00
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8117.370256 task clock ticks # 11.281 CPU utilization factor
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678 context switches # 0.000 M/sec
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133 CPU migrations # 0.000 M/sec
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235724 pagefaults # 0.029 M/sec
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24821162526 CPU cycles # 3057.784 M/sec
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18687303457 instructions # 2302.138 M/sec
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172158895 cache references # 21.209 M/sec
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27075259 cache misses # 3.335 M/sec
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2009-04-20 21:52:29 +08:00
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2009-06-04 22:33:00 +08:00
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Wall-clock time elapsed: 719.554352 msecs
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2009-04-20 21:52:29 +08:00
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SEE ALSO
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--------
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2009-06-06 20:56:33 +08:00
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linkperf:perf-top[1], linkperf:perf-list[1]
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