One example, 'triad_loop' runs on cpu16 (atom core), while we can see the
scaled value for core cycles is 160,444,092 and the percentage is 0.47%.
-perf stat -e cycles -- taskset -c 16 ./triad_loop
+perf stat -e cycles \-- taskset -c 16 ./triad_loop
As previous, two events are created.
--------
[verse]
'perf stat' [-e <EVENT> | --event=EVENT] [-a] <command>
-'perf stat' [-e <EVENT> | --event=EVENT] [-a] -- <command> [<options>]
-'perf stat' [-e <EVENT> | --event=EVENT] [-a] record [-o file] -- <command> [<options>]
+'perf stat' [-e <EVENT> | --event=EVENT] [-a] \-- <command> [<options>]
+'perf stat' [-e <EVENT> | --event=EVENT] [-a] record [-o file] \-- <command> [<options>]
'perf stat' report [-i file]
DESCRIPTION
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
+ 3>results perf stat --log-fd 3 \-- $cmd
+ 3>>results perf stat --log-fd 3 --append \-- $cmd
--control=fifo:ctl-fifo[,ack-fifo]::
--control=fd:ctl-fd[,ack-fd]::
perf stat -D -1 -e cpu-cycles -a -I 1000 \
--control fd:${ctl_fd},${ctl_fd_ack} \
- -- sleep 30 &
+ \-- sleep 30 &
perf_pid=$!
sleep 5 && echo 'enable' >&${ctl_fd} && read -u ${ctl_fd_ack} e1 && echo "enabled(${e1})"
--post::
Pre and post measurement hooks, e.g.:
-perf stat --repeat 10 --null --sync --pre 'make -s O=defconfig-build/clean' -- make -s -j64 O=defconfig-build/ bzImage
+perf stat --repeat 10 --null --sync --pre 'make -s O=defconfig-build/clean' \-- make -s -j64 O=defconfig-build/ bzImage
-I msecs::
--interval-print msecs::
EXAMPLES
--------
-$ perf stat -- make
+$ perf stat \-- make
Performance counter stats for 'make':