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Livre :
Expressions régulières,
Syntaxe et mise en oeuvre :

ISBN : 978-2-7460-9712-4
EAN : 9782746097124
(Editions ENI)

GNU/Linux	Debian 6.0.1 (Squeeze)
	perf_2.6.32-stat(1)

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PERF−STAT

NAME
SYNOPSIS
DESCRIPTION
OPTIONS
EXAMPLES
SEE ALSO

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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, −−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

perf_2.6.32-top(1), perf_2.6.32-list(1)

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perf_2.6.32-stat(1)