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perf-stat

Langue: en

Version: 09/20/2010 (ubuntu - 24/10/10)

Section: 1 (Commandes utilisateur)

NAME

perf-stat - Run a command and gather performance counter statistics

SYNOPSIS

 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, --no-inherit

child tasks do not inherit counters

-p, --pid=<pid>

stat events on existing pid

-a

system-wide collection

-c

scale counter values

-B

print large numbers with thousands' separators according to locale

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

perf-top(1), perf-list(1)

La dernière démarche de la raison est de reconnaître
qu'il y a une infinité de choses qui la surpassent.
-+- Blaise Pascal (1623-1662), Pensées IV.267 -+-