PERF-BENCH(1)

NAME
perf-bench - General framework for benchmark suites

SYNOPSIS

perf bench [<common options>] <subsystem> <suite> [<options>]

DESCRIPTION

This perf bench command is a general framework for benchmark suites.

COMMON OPTIONS

-f, --format=
    Specify format style. Current available format styles are:

default
    Default style. This is mainly for human reading.

    .ft C
    % perf bench sched pipe                      # with no style specified
    (executing 1000000 pipe operations between two tasks)
            Total time:5.855 sec
                    5.855061 usecs/op
                    170792 ops/sec
    .ft

simple
    This simple style is friendly for automated processing by scripts.

    .ft C
    % perf bench --format=simple sched pipe      # specified simple
    5.988
    .ft

SUBSYSTEM

sched
    Scheduler and IPC mechanisms.

mem
    Memory access performance.

all
    All benchmark subsystems.

  SUITES FOR sched

messaging
    Suite for evaluating performance of scheduler and IPC mechanisms. Based on hackbench by Rusty Russell.

Options of messaging

    -p, --pipe
        Use pipe() instead of socketpair()

    -t, --thread
        Be multi thread instead of multi process

    -g, --group=
        Specify number of groups

    -l, --loop=
        Specify number of loops

Example of messaging

        .ft C
        % perf bench sched messaging                 # run with default
        options (20 sender and receiver processes per group)
        (10 groups == 400 processes run)

              Total time:0.308 sec

        % perf bench sched messaging -t -g 20        # be multi-thread, with 20 groups
        (20 sender and receiver threads per group)
        (20 groups == 800 threads run)

              Total time:0.582 sec
        .ft

    pipe
        Suite for pipe() system call. Based on pipe-test-1m.c by Ingo Molnar.

Options of pipe

    -l, --loop=
        Specify number of loops.

Example of pipe

        .ft C
        % perf bench sched pipe
        (executing 1000000 pipe operations between two tasks)

                Total time:8.091 sec
                        8.091833 usecs/op
                        123581 ops/sec

        % perf bench sched pipe -l 1000              # loop 1000
        (executing 1000 pipe operations between two tasks)

                Total time:0.016 sec
                        16.948000 usecs/op
                        59004 ops/sec
        .ft

  SUITES FOR mem

memcpy
    Suite for evaluating performance of simple memory copy in various ways.

Options of memcpy

    -l, --length
        Specify length of memory to copy (default: 1MB). Available units are B, KB, MB, GB and TB (case insensitive).

    -r, --routine
        Specify routine to copy (default: default). Available routines are depend on the architecture. On x86-64, x86-64-unrolled, x86-64-movsq and x86-64-movsb are supported.

    -i, --iterations
        Repeat memcpy invocation this number of times.

    -c, --cycle
        Use perf’s cpu-cycles event instead of gettimeofday syscall.

    -o, --only-prefault
        Show only the result with page faults before memcpy.

    -n, --no-prefault
        Show only the result without page faults before memcpy.

    memset
        Suite for evaluating performance of simple memory set in various ways.

Options of memset

    -l, --length
        Specify length of memory to set (default: 1MB). Available units are B, KB, MB, GB and TB (case insensitive).

    -r, --routine
        Specify routine to set (default: default). Available routines are depend on the architecture. On x86-64, x86-64-unrolled, x86-64-stosq and x86-64-stosb are supported.

    -i, --iterations
        Repeat memset invocation this number of times.

    -c, --cycle
        Use perf’s cpu-cycles event instead of gettimeofday syscall.

    -o, --only-prefault
        Show only the result with page faults before memset.

    -n, --no-prefault
        Show only the result without page faults before memset.

SEE ALSO

perf(1)