I want to monitor Linux cache miss rate.

I want to print out what percentage of L2 cache miss rate is on the screen when using a specific command, which command should I use?

linux cache

2022-09-22 22:00

1 Answers

Linux has a tool called perf.

perf stat -B <command...>

When executed as above, performance indicators are output after the command output (i.e., after the program runs and exits) as follows:

<The screen output of the command>

 Performance counter stats for 'ls':

          2.076373      task-clock (msec)         #    0.775 CPUs utilized
                 0      context-switches          #    0.000 K/sec
                 0      cpu-migrations            #    0.000 K/sec
               262      page-faults               #    0.126 M/sec
         5,062,230      cycles                    #    2.438 GHz                     [64.69%]
         3,657,439      stalled-cycles-frontend   #   72.25% frontend cycles idle    [52.08%]
         3,131,202      stalled-cycles-backend    #   61.85% backend  cycles idle
         2,006,362      instructions              #    0.40  insns per cycle
                                                  #    #    1.82  stalled cycles per insn
           495,853      branches                  #  238.807 M/sec
            14,877      branch-misses             #    3.00% of all branches

       0.002679898 seconds time elapsed

For the perf tool, see https://perf.wiki.kernel.org/index.php/Tutorial.

L2 Cache

If it's L2 cache, you can see LLC-loads and LLC-load-misses, LLC-store-misses, LLC-prefetch-misses. LLC stands for Last Level Cache.

To check with perf, do the following:

perf record -e LLC-loads, LLC-load-misses <command...>

If you run as above, you will see a file called perf.data that you can check the history by using the following command:

perf report

If compilation is possible, I think we can get better results if we use the -g option.

2022-09-22 22:00

If you have any answers or tips

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