17d7a1123f
As Namhyung Kim pointed, there are confused namings and descriptions of words "cycle" and "clock" in mem-memset.c and mem-memcpy.c. With the option "-c" (or "--clock", now renamed as "--cycle"), mem subsystem measures cost of memset() and memcpy() with cpu-cycles event. But current mem subsystem source code contains lots of confused variable namings and descriptions with "clock" (e.g. the variable use_clock). This is a very bad style because there is another software event named "cpu-clock". This patch replaces wrong usage of "clock" to "cycle". v2: modified Documentation/perf-bench.txt for the descriptions of --cycle option Signed-off-by: Hitoshi Mitake <h.mitake@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Link: http://lkml.kernel.org/r/1341236777-18457-1-git-send-email-h.mitake@gmail.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
193 lines
3.9 KiB
Plaintext
193 lines
3.9 KiB
Plaintext
perf-bench(1)
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=============
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NAME
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----
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perf-bench - General framework for benchmark suites
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SYNOPSIS
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--------
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[verse]
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'perf bench' [<common options>] <subsystem> <suite> [<options>]
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DESCRIPTION
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-----------
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This 'perf bench' command is a general framework for benchmark suites.
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COMMON OPTIONS
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--------------
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-f::
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--format=::
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Specify format style.
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Current available format styles are:
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'default'::
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Default style. This is mainly for human reading.
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---------------------
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% perf bench sched pipe # with no style specified
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(executing 1000000 pipe operations between two tasks)
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Total time:5.855 sec
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5.855061 usecs/op
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170792 ops/sec
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---------------------
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'simple'::
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This simple style is friendly for automated
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processing by scripts.
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---------------------
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% perf bench --format=simple sched pipe # specified simple
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5.988
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---------------------
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SUBSYSTEM
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---------
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'sched'::
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Scheduler and IPC mechanisms.
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'mem'::
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Memory access performance.
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'all'::
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All benchmark subsystems.
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SUITES FOR 'sched'
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~~~~~~~~~~~~~~~~~~
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*messaging*::
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Suite for evaluating performance of scheduler and IPC mechanisms.
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Based on hackbench by Rusty Russell.
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Options of *messaging*
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^^^^^^^^^^^^^^^^^^^^^^
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-p::
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--pipe::
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Use pipe() instead of socketpair()
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-t::
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--thread::
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Be multi thread instead of multi process
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-g::
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--group=::
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Specify number of groups
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-l::
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--loop=::
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Specify number of loops
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Example of *messaging*
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^^^^^^^^^^^^^^^^^^^^^^
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---------------------
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% perf bench sched messaging # run with default
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options (20 sender and receiver processes per group)
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(10 groups == 400 processes run)
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Total time:0.308 sec
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% perf bench sched messaging -t -g 20 # be multi-thread, with 20 groups
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(20 sender and receiver threads per group)
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(20 groups == 800 threads run)
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Total time:0.582 sec
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---------------------
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*pipe*::
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Suite for pipe() system call.
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Based on pipe-test-1m.c by Ingo Molnar.
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Options of *pipe*
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^^^^^^^^^^^^^^^^^
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-l::
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--loop=::
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Specify number of loops.
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Example of *pipe*
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^^^^^^^^^^^^^^^^^
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---------------------
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% perf bench sched pipe
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(executing 1000000 pipe operations between two tasks)
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Total time:8.091 sec
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8.091833 usecs/op
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123581 ops/sec
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% perf bench sched pipe -l 1000 # loop 1000
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(executing 1000 pipe operations between two tasks)
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Total time:0.016 sec
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16.948000 usecs/op
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59004 ops/sec
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---------------------
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SUITES FOR 'mem'
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~~~~~~~~~~~~~~~~
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*memcpy*::
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Suite for evaluating performance of simple memory copy in various ways.
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Options of *memcpy*
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^^^^^^^^^^^^^^^^^^^
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-l::
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--length::
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Specify length of memory to copy (default: 1MB).
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Available units are B, KB, MB, GB and TB (case insensitive).
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-r::
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--routine::
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Specify routine to copy (default: default).
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Available routines are depend on the architecture.
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On x86-64, x86-64-unrolled, x86-64-movsq and x86-64-movsb are supported.
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-i::
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--iterations::
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Repeat memcpy invocation this number of times.
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-c::
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--cycle::
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Use perf's cpu-cycles event instead of gettimeofday syscall.
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-o::
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--only-prefault::
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Show only the result with page faults before memcpy.
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-n::
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--no-prefault::
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Show only the result without page faults before memcpy.
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*memset*::
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Suite for evaluating performance of simple memory set in various ways.
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Options of *memset*
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^^^^^^^^^^^^^^^^^^^
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-l::
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--length::
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Specify length of memory to set (default: 1MB).
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Available units are B, KB, MB, GB and TB (case insensitive).
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-r::
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--routine::
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Specify routine to set (default: default).
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Available routines are depend on the architecture.
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On x86-64, x86-64-unrolled, x86-64-stosq and x86-64-stosb are supported.
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-i::
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--iterations::
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Repeat memset invocation this number of times.
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-c::
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--cycle::
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Use perf's cpu-cycles event instead of gettimeofday syscall.
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-o::
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--only-prefault::
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Show only the result with page faults before memset.
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-n::
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--no-prefault::
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Show only the result without page faults before memset.
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SEE ALSO
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--------
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linkperf:perf[1]
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