man-page

PERF-BENCH(1)
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

-r, --repeat=

Specify amount of times to repeat the run (default 10).

-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.

syscall

System call performance (throughput).

mem

Memory access performance.

numa

NUMA scheduling and MM benchmarks.

futex

Futex stressing benchmarks.

epoll

Eventpoll (epoll) stressing benchmarks.

internals

Benchmark internal perf functionality.

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, --nr_loops=

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 syscall

basic

Suite for evaluating performance of core system call throughput (both usecs/op and ops/sec metrics). This uses a single thread simply doing getppid(2), which is a simple syscall where the result is not cached by glibc.

SUITES FOR mem

memcpy

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

Options of memcpy

-l, --size

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

-f, --function

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

-l, --nr_loops

Repeat memcpy invocation this number of times.

-c, --cycles

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

memset

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

Options of memset

-l, --size

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

-f, --function

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

-l, --nr_loops

Repeat memset invocation this number of times.

-c, --cycles

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