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SubjectRe: [patch] cache-miss and cache-refs events on P6-mobile CPUs
On Tue, Aug 11, 2009 at 11:34:05AM +0200, Ingo Molnar wrote:
>
> Could you try the patch below, does it do the trick? Note, since
> there's just two generic counters and perf stat uses four counters,
> you'll need to run longer commands than 'true' or something like:
>
> perf stat -a sleep 1
>
> or:
>
> perf stat --repeat 10 /bin/ls -R /usr/bin >/dev/null
>
> to get all counters excercised and time-shared on your CPU.

OK, here are the results:

# ./perf stat -a true

Performance counter stats for 'true':

1.332145 task-clock-msecs # 1.057 CPUs
4 context-switches # 0.003 M/sec
0 CPU-migrations # 0.000 M/sec
121 page-faults # 0.091 M/sec
788333 cycles # 591.777 M/sec
610408 instructions # 0.774 IPC
<not counted> cache-references
<not counted> cache-misses

0.001260775 seconds time elapsed

# ./perf stat -a sleep 1

Performance counter stats for 'sleep 1':

1001.358010 task-clock-msecs # 1.000 CPUs
253 context-switches # 0.000 M/sec
0 CPU-migrations # 0.000 M/sec
145 page-faults # 0.000 M/sec
8841883 cycles # 8.830 M/sec (scaled from 85.04%)
6361047 instructions # 0.719 IPC (scaled from 78.03%)
801847 cache-references # 0.801 M/sec (scaled from 14.96%)
16925 cache-misses # 0.017 M/sec (scaled from 21.97%)

1.001540692 seconds time elapsed

# ./perf stat --repeat 10 /bin/ls -R /usr/bin >/dev/null

Performance counter stats for '/bin/ls -R /usr/bin' (10 runs):

8.642859 task-clock-msecs # 0.939 CPUs ( +- 2.382% )
1 context-switches # 0.000 M/sec ( +- 0.000% )
0 CPU-migrations # 0.000 M/sec ( +- 0.000% )
375 page-faults # 0.043 M/sec ( +- 0.000% )
14796621 cycles # 1712.005 M/sec ( +- 0.306% )
15526008 instructions # 1.049 IPC ( +- 0.020% )
<not counted> cache-references
<not counted> cache-misses

0.009207932 seconds time elapsed ( +- 4.020% )

# ./perf stat --repeat 10 /bin/ls -lR /usr/bin >/dev/null

Performance counter stats for '/bin/ls -lR /usr/bin' (10 runs):

49.894190 task-clock-msecs # 0.762 CPUs ( +- 8.231% )
45 context-switches # 0.001 M/sec ( +- 52.174% )
0 CPU-migrations # 0.000 M/sec ( +- 0.000% )
476 page-faults # 0.010 M/sec ( +- 0.000% )
81036819 cycles # 1624.173 M/sec ( +- 3.166% ) (scaled from 96.03%)
88822455 instructions # 1.096 IPC ( +- 2.108% ) (scaled from 96.42%)
573228 cache-references # 11.489 M/sec ( +- 37.947% )
<not counted> cache-misses

0.065464625 seconds time elapsed ( +- 19.349% )

# ./perf stat --repeat 10 /bin/ls -R /usr/lib >/dev/null

Performance counter stats for '/bin/ls -R /usr/lib' (10 runs):

136.771643 task-clock-msecs # 0.075 CPUs ( +- 19.292% )
757 context-switches # 0.006 M/sec ( +- 56.332% )
0 CPU-migrations # 0.000 M/sec ( +- 0.000% )
343 page-faults # 0.003 M/sec ( +- 0.000% )
173125500 cycles # 1265.800 M/sec ( +- 5.034% ) (scaled from 78.21%)
174597635 instructions # 1.009 IPC ( +- 1.829% ) (scaled from 78.34%)
2441413 cache-references # 17.850 M/sec ( +- 18.289% ) (scaled from 21.79%)
21112 cache-misses # 0.154 M/sec ( +- 11.183% ) (scaled from 21.66%)

1.824204481 seconds time elapsed ( +- 29.781% )


Johannes


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