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Allows a way of measuring low level kernel implementation of FUTEX_LOCK_PI and FUTEX_UNLOCK_PI. The program comes in two flavors: (i) single futex (default), all threads contend on the same uaddr. For the sake of the benchmark, we call into kernel space even when the lock is uncontended. The kernel will set it to TID, any waters that come in and contend for the pi futex will be handled respectively by the kernel. (ii) -M option for multiple futexes, each thread deals with its own futex. This is a trivial scenario and only measures kernel handling of 0->TID transition. Signed-off-by: Davidlohr Bueso <dbueso@suse.de> Cc: Mel Gorman <mgorman@suse.de> Link: http://lkml.kernel.org/r/1436259353.12255.78.camel@stgolabs.net Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
225 lines
4.5 KiB
Text
225 lines
4.5 KiB
Text
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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-r::
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--repeat=::
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Specify amount of times to repeat the run (default 10).
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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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'numa'::
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NUMA scheduling and MM benchmarks.
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'futex'::
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Futex stressing benchmarks.
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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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SUITES FOR 'numa'
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~~~~~~~~~~~~~~~~~
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*mem*::
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Suite for evaluating NUMA workloads.
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SUITES FOR 'futex'
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~~~~~~~~~~~~~~~~~~
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*hash*::
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Suite for evaluating hash tables.
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*wake*::
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Suite for evaluating wake calls.
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*wake-parallel*::
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Suite for evaluating parallel wake calls.
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*requeue*::
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Suite for evaluating requeue calls.
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*lock-pi*::
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Suite for evaluating futex lock_pi calls.
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SEE ALSO
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--------
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linkperf:perf[1]
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