perf_3.16-bench (1)

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

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

-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

sched

Scheduler and IPC mechanisms.

mem

Memory access performance.

numa

NUMA scheduling and MM benchmarks.

futex

Futex stressing benchmarks.

all

All benchmark subsystems.

SUITES FOR \fIsched\fR

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 \fImem\fR

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\(cqs 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\(cqs 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.

SUITES FOR \fInuma\fR

mem

Suite for evaluating NUMA workloads.

SUITES FOR \fIfutex\fR

hash

Suite for evaluating hash tables.

wake

Suite for evaluating wake calls.

requeue

Suite for evaluating requeue calls.

perf(1)