2009-11-10 11:50:54 +00:00
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perf-bench(1)
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2010-05-05 14:23:27 +00:00
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=============
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2009-11-10 11:50:54 +00:00
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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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2012-06-20 06:08:06 +00:00
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This 'perf bench' command is a general framework for benchmark suites.
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2009-11-10 11:50:54 +00:00
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COMMON OPTIONS
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--------------
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2014-06-16 18:14:19 +00:00
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-r::
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--repeat=::
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2023-01-22 12:20:32 +00:00
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Specify number of times to repeat the run (default 10).
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2014-06-16 18:14:19 +00:00
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2009-11-10 11:50:54 +00:00
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-f::
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--format=::
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Specify format style.
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2010-03-31 18:31:00 +00:00
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Current available format styles are:
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2009-11-10 11:50:54 +00:00
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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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2010-03-31 18:31:00 +00:00
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% perf bench sched pipe # with no style specified
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2009-11-10 11:50:54 +00:00
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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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2019-03-08 18:17:47 +00:00
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'syscall'::
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System call performance (throughput).
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2012-06-20 06:08:06 +00:00
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'mem'::
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Memory access performance.
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2014-03-27 23:50:18 +00:00
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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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perf bench: Add epoll parallel epoll_wait benchmark
This program benchmarks concurrent epoll_wait(2) for file descriptors
that are monitored with with EPOLLIN along various semantics, by a
single epoll instance. Such conditions can be found when using
single/combined or multiple queuing when load balancing.
Each thread has a number of private, nonblocking file descriptors,
referred to as fdmap. A writer thread will constantly be writing to the
fdmaps of all threads, minimizing each threads's chances of epoll_wait
not finding any ready read events and blocking as this is not what we
want to stress. Full details in the start of the C file.
Committer testing:
# perf bench
Usage:
perf bench [<common options>] <collection> <benchmark> [<options>]
# List of all available benchmark collections:
sched: Scheduler and IPC benchmarks
mem: Memory access benchmarks
numa: NUMA scheduling and MM benchmarks
futex: Futex stressing benchmarks
epoll: Epoll stressing benchmarks
all: All benchmarks
# perf bench epoll
# List of available benchmarks for collection 'epoll':
wait: Benchmark epoll concurrent epoll_waits
all: Run all futex benchmarks
# perf bench epoll wait
# Running 'epoll/wait' benchmark:
Run summary [PID 19295]: 3 threads monitoring on 64 file-descriptors for 8 secs.
[thread 0] fdmap: 0xdaa650 ... 0xdaa74c [ 328241 ops/sec ]
[thread 1] fdmap: 0xdaa900 ... 0xdaa9fc [ 351695 ops/sec ]
[thread 2] fdmap: 0xdaabb0 ... 0xdaacac [ 381423 ops/sec ]
Averaged 353786 operations/sec (+- 4.35%), total secs = 8
#
Committer notes:
Fix the build on debian:experimental-x-mips, debian:experimental-x-mipsel
and others:
CC /tmp/build/perf/bench/epoll-wait.o
bench/epoll-wait.c: In function 'writerfn':
bench/epoll-wait.c:399:12: error: format '%ld' expects argument of type 'long int', but argument 2 has type 'size_t' {aka 'unsigned int'} [-Werror=format=]
printinfo("exiting writer-thread (total full-loops: %ld)\n", iter);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~
bench/epoll-wait.c:86:31: note: in definition of macro 'printinfo'
do { if (__verbose) { printf(fmt, ## arg); fflush(stdout); } } while (0)
^~~
cc1: all warnings being treated as errors
Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Davidlohr Bueso <dbueso@suse.de>
Cc: Jason Baron <jbaron@akamai.com> <jbaron@akamai.com>
Link: http://lkml.kernel.org/r/20181106152226.20883-2-dave@stgolabs.net
Link: http://lkml.kernel.org/r/20181106182349.thdkpvshkna5vd7o@linux-r8p5>
[ Applied above fixup as per Davidlohr's request ]
[ Use inttypes.h to print rlim_t fields, fixing the build on Alpine Linux / musl libc ]
[ Check if eventfd() is available, i.e. if HAVE_EVENTFD is defined ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2018-11-06 15:22:25 +00:00
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'epoll'::
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Eventpoll (epoll) stressing benchmarks.
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2020-04-02 15:43:53 +00:00
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'internals'::
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Benchmark internal perf functionality.
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2023-06-02 18:18:27 +00:00
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'uprobe'::
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Benchmark overhead of uprobe + BPF.
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2012-06-20 06:08:06 +00:00
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'all'::
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All benchmark subsystems.
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2009-11-10 11:50:54 +00:00
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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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2012-06-20 06:08:06 +00:00
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Options of *messaging*
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^^^^^^^^^^^^^^^^^^^^^^
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2009-11-10 11:50:54 +00:00
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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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2015-10-19 08:04:28 +00:00
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--nr_loops=::
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2009-11-10 11:50:54 +00:00
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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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2010-03-31 18:31:00 +00:00
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% perf bench sched messaging -t -g 20 # be multi-thread, with 20 groups
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2009-11-10 11:50:54 +00:00
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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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2023-10-17 20:23:42 +00:00
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-G::
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--cgroups=::
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Names of cgroups for sender and receiver, separated by a comma.
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This is useful to check cgroup context switching overhead.
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Note that perf doesn't create nor delete the cgroups, so users should
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make sure that the cgroups exist and are accessible before use.
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2009-11-10 11:50:54 +00:00
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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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2023-10-17 20:23:42 +00:00
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% perf bench sched pipe -G AAA,BBB
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(executing 1000000 pipe operations between cgroups)
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# Running 'sched/pipe' benchmark:
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# Executed 1000000 pipe operations between two processes
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Total time: 6.886 [sec]
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6.886208 usecs/op
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145217 ops/sec
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2009-11-10 11:50:54 +00:00
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---------------------
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2019-03-08 18:17:47 +00:00
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SUITES FOR 'syscall'
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~~~~~~~~~~~~~~~~~~
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*basic*::
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Suite for evaluating performance of core system call throughput (both usecs/op and ops/sec metrics).
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This uses a single thread simply doing getppid(2), which is a simple syscall where the result is not
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cached by glibc.
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2012-06-20 06:08:06 +00:00
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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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2015-10-19 08:04:25 +00:00
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--size::
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Specify size of memory to copy (default: 1MB).
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2012-06-20 06:08:06 +00:00
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Available units are B, KB, MB, GB and TB (case insensitive).
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2015-10-19 08:04:29 +00:00
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-f::
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--function::
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Specify function to copy (default: default).
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Available functions are depend on the architecture.
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2012-06-20 06:08:06 +00:00
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On x86-64, x86-64-unrolled, x86-64-movsq and x86-64-movsb are supported.
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2015-10-19 08:04:28 +00:00
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-l::
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--nr_loops::
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2012-06-20 06:08:06 +00:00
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Repeat memcpy invocation this number of times.
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-c::
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2015-10-19 08:04:23 +00:00
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--cycles::
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2012-06-20 06:08:06 +00:00
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Use perf's cpu-cycles event instead of gettimeofday syscall.
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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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2015-10-19 08:04:25 +00:00
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--size::
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Specify size of memory to set (default: 1MB).
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2012-06-20 06:08:06 +00:00
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Available units are B, KB, MB, GB and TB (case insensitive).
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2015-10-19 08:04:29 +00:00
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-f::
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--function::
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Specify function to set (default: default).
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Available functions are depend on the architecture.
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2012-06-20 06:08:06 +00:00
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On x86-64, x86-64-unrolled, x86-64-stosq and x86-64-stosb are supported.
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2015-10-19 08:04:28 +00:00
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-l::
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--nr_loops::
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2012-06-20 06:08:06 +00:00
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Repeat memset invocation this number of times.
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-c::
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2015-10-19 08:04:23 +00:00
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--cycles::
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2012-06-20 06:08:06 +00:00
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Use perf's cpu-cycles event instead of gettimeofday syscall.
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2014-03-27 23:50:18 +00:00
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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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2015-05-08 18:37:59 +00:00
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*wake-parallel*::
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Suite for evaluating parallel wake calls.
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2014-03-27 23:50:18 +00:00
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*requeue*::
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Suite for evaluating requeue calls.
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2015-07-07 08:55:53 +00:00
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*lock-pi*::
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Suite for evaluating futex lock_pi calls.
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perf bench: Add epoll parallel epoll_wait benchmark
This program benchmarks concurrent epoll_wait(2) for file descriptors
that are monitored with with EPOLLIN along various semantics, by a
single epoll instance. Such conditions can be found when using
single/combined or multiple queuing when load balancing.
Each thread has a number of private, nonblocking file descriptors,
referred to as fdmap. A writer thread will constantly be writing to the
fdmaps of all threads, minimizing each threads's chances of epoll_wait
not finding any ready read events and blocking as this is not what we
want to stress. Full details in the start of the C file.
Committer testing:
# perf bench
Usage:
perf bench [<common options>] <collection> <benchmark> [<options>]
# List of all available benchmark collections:
sched: Scheduler and IPC benchmarks
mem: Memory access benchmarks
numa: NUMA scheduling and MM benchmarks
futex: Futex stressing benchmarks
epoll: Epoll stressing benchmarks
all: All benchmarks
# perf bench epoll
# List of available benchmarks for collection 'epoll':
wait: Benchmark epoll concurrent epoll_waits
all: Run all futex benchmarks
# perf bench epoll wait
# Running 'epoll/wait' benchmark:
Run summary [PID 19295]: 3 threads monitoring on 64 file-descriptors for 8 secs.
[thread 0] fdmap: 0xdaa650 ... 0xdaa74c [ 328241 ops/sec ]
[thread 1] fdmap: 0xdaa900 ... 0xdaa9fc [ 351695 ops/sec ]
[thread 2] fdmap: 0xdaabb0 ... 0xdaacac [ 381423 ops/sec ]
Averaged 353786 operations/sec (+- 4.35%), total secs = 8
#
Committer notes:
Fix the build on debian:experimental-x-mips, debian:experimental-x-mipsel
and others:
CC /tmp/build/perf/bench/epoll-wait.o
bench/epoll-wait.c: In function 'writerfn':
bench/epoll-wait.c:399:12: error: format '%ld' expects argument of type 'long int', but argument 2 has type 'size_t' {aka 'unsigned int'} [-Werror=format=]
printinfo("exiting writer-thread (total full-loops: %ld)\n", iter);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~
bench/epoll-wait.c:86:31: note: in definition of macro 'printinfo'
do { if (__verbose) { printf(fmt, ## arg); fflush(stdout); } } while (0)
^~~
cc1: all warnings being treated as errors
Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Davidlohr Bueso <dbueso@suse.de>
Cc: Jason Baron <jbaron@akamai.com> <jbaron@akamai.com>
Link: http://lkml.kernel.org/r/20181106152226.20883-2-dave@stgolabs.net
Link: http://lkml.kernel.org/r/20181106182349.thdkpvshkna5vd7o@linux-r8p5>
[ Applied above fixup as per Davidlohr's request ]
[ Use inttypes.h to print rlim_t fields, fixing the build on Alpine Linux / musl libc ]
[ Check if eventfd() is available, i.e. if HAVE_EVENTFD is defined ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2018-11-06 15:22:25 +00:00
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SUITES FOR 'epoll'
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~~~~~~~~~~~~~~~~~~
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*wait*::
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Suite for evaluating concurrent epoll_wait calls.
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2015-07-07 08:55:53 +00:00
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perf bench: Add epoll_ctl(2) benchmark
Benchmark the various operations allowed for epoll_ctl(2). The idea is
to concurrently stress a single epoll instance doing add/mod/del
operations.
Committer testing:
# perf bench epoll ctl
# Running 'epoll/ctl' benchmark:
Run summary [PID 20344]: 4 threads doing epoll_ctl ops 64 file-descriptors for 8 secs.
[thread 0] fdmap: 0x21a46b0 ... 0x21a47ac [ add: 1680960 ops; mod: 1680960 ops; del: 1680960 ops ]
[thread 1] fdmap: 0x21a4960 ... 0x21a4a5c [ add: 1685440 ops; mod: 1685440 ops; del: 1685440 ops ]
[thread 2] fdmap: 0x21a4c10 ... 0x21a4d0c [ add: 1674368 ops; mod: 1674368 ops; del: 1674368 ops ]
[thread 3] fdmap: 0x21a4ec0 ... 0x21a4fbc [ add: 1677568 ops; mod: 1677568 ops; del: 1677568 ops ]
Averaged 1679584 ADD operations (+- 0.14%)
Averaged 1679584 MOD operations (+- 0.14%)
Averaged 1679584 DEL operations (+- 0.14%)
#
Lets measure those calls with 'perf trace' to get a glympse at what this
benchmark is doing in terms of syscalls:
# perf trace -m32768 -s perf bench epoll ctl
# Running 'epoll/ctl' benchmark:
Run summary [PID 20405]: 4 threads doing epoll_ctl ops 64 file-descriptors for 8 secs.
[thread 0] fdmap: 0x21764e0 ... 0x21765dc [ add: 1100480 ops; mod: 1100480 ops; del: 1100480 ops ]
[thread 1] fdmap: 0x2176790 ... 0x217688c [ add: 1250176 ops; mod: 1250176 ops; del: 1250176 ops ]
[thread 2] fdmap: 0x2176a40 ... 0x2176b3c [ add: 1022464 ops; mod: 1022464 ops; del: 1022464 ops ]
[thread 3] fdmap: 0x2176cf0 ... 0x2176dec [ add: 705472 ops; mod: 705472 ops; del: 705472 ops ]
Averaged 1019648 ADD operations (+- 11.27%)
Averaged 1019648 MOD operations (+- 11.27%)
Averaged 1019648 DEL operations (+- 11.27%)
Summary of events:
epoll-ctl (20405), 1264 events, 0.0%
syscall calls total min avg max stddev
(msec) (msec) (msec) (msec) (%)
--------------- -------- --------- --------- --------- --------- ------
eventfd2 256 9.514 0.001 0.037 5.243 68.00%
clone 4 1.245 0.204 0.311 0.531 24.13%
mprotect 66 0.345 0.002 0.005 0.021 7.43%
openat 45 0.313 0.004 0.007 0.073 21.93%
mmap 88 0.302 0.002 0.003 0.013 5.02%
futex 4 0.160 0.002 0.040 0.140 83.43%
sched_setaffinity 4 0.124 0.005 0.031 0.070 49.39%
read 44 0.103 0.001 0.002 0.013 15.54%
fstat 40 0.052 0.001 0.001 0.003 5.43%
close 39 0.039 0.001 0.001 0.001 1.48%
stat 9 0.034 0.003 0.004 0.006 7.30%
access 3 0.023 0.007 0.008 0.008 4.25%
open 2 0.021 0.008 0.011 0.013 22.60%
getdents 4 0.019 0.001 0.005 0.009 37.15%
write 2 0.013 0.004 0.007 0.009 38.48%
munmap 1 0.010 0.010 0.010 0.010 0.00%
brk 3 0.006 0.001 0.002 0.003 26.34%
rt_sigprocmask 2 0.004 0.001 0.002 0.003 43.95%
rt_sigaction 3 0.004 0.001 0.001 0.002 16.07%
prlimit64 3 0.004 0.001 0.001 0.001 5.39%
prctl 1 0.003 0.003 0.003 0.003 0.00%
epoll_create 1 0.003 0.003 0.003 0.003 0.00%
lseek 2 0.002 0.001 0.001 0.001 11.42%
sched_getaffinity 1 0.002 0.002 0.002 0.002 0.00%
arch_prctl 1 0.002 0.002 0.002 0.002 0.00%
set_tid_address 1 0.001 0.001 0.001 0.001 0.00%
getpid 1 0.001 0.001 0.001 0.001 0.00%
set_robust_list 1 0.001 0.001 0.001 0.001 0.00%
execve 1 0.000 0.000 0.000 0.000 0.00%
epoll-ctl (20406), 1245480 events, 14.6%
syscall calls total min avg max stddev
(msec) (msec) (msec) (msec) (%)
--------------- -------- --------- --------- --------- --------- ------
epoll_ctl 619511 1034.927 0.001 0.002 6.691 0.67%
nanosleep 3226 616.114 0.006 0.191 10.376 7.57%
futex 2 11.336 0.002 5.668 11.334 99.97%
set_robust_list 1 0.001 0.001 0.001 0.001 0.00%
clone 1 0.000 0.000 0.000 0.000 0.00%
epoll-ctl (20407), 1243151 events, 14.5%
syscall calls total min avg max stddev
(msec) (msec) (msec) (msec) (%)
--------------- -------- --------- --------- --------- --------- ------
epoll_ctl 618350 1042.181 0.001 0.002 2.512 0.40%
nanosleep 3220 366.261 0.012 0.114 18.162 9.59%
futex 4 5.463 0.001 1.366 5.427 99.12%
set_robust_list 1 0.002 0.002 0.002 0.002 0.00%
epoll-ctl (20408), 1801690 events, 21.1%
syscall calls total min avg max stddev
(msec) (msec) (msec) (msec) (%)
--------------- -------- --------- --------- --------- --------- ------
epoll_ctl 896174 1540.581 0.001 0.002 6.987 0.74%
nanosleep 4667 783.393 0.006 0.168 10.419 7.10%
futex 2 4.682 0.002 2.341 4.681 99.93%
set_robust_list 1 0.002 0.002 0.002 0.002 0.00%
clone 1 0.000 0.000 0.000 0.000 0.00%
epoll-ctl (20409), 4254890 events, 49.8%
syscall calls total min avg max stddev
(msec) (msec) (msec) (msec) (%)
--------------- -------- --------- --------- --------- --------- ------
epoll_ctl 2116416 3768.097 0.001 0.002 9.956 0.41%
nanosleep 11023 1141.778 0.006 0.104 9.447 4.95%
futex 3 0.037 0.002 0.012 0.029 70.50%
set_robust_list 1 0.008 0.008 0.008 0.008 0.00%
madvise 1 0.005 0.005 0.005 0.005 0.00%
clone 1 0.000 0.000 0.000 0.000 0.00%
#
Committer notes:
Fix build on fedora:24-x-ARC-uClibc, debian:experimental-x-mips,
debian:experimental-x-mipsel, ubuntu:16.04-x-arm and ubuntu:16.04-x-powerpc
CC /tmp/build/perf/bench/epoll-ctl.o
bench/epoll-ctl.c: In function 'init_fdmaps':
bench/epoll-ctl.c:214:16: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare]
for (i = 0; i < nfds; i+=inc) {
^
bench/epoll-ctl.c: In function 'bench_epoll_ctl':
bench/epoll-ctl.c:377:16: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare]
for (i = 0; i < nthreads; i++) {
^
bench/epoll-ctl.c:388:16: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare]
for (i = 0; i < nthreads; i++) {
^
cc1: all warnings being treated as errors
Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Davidlohr Bueso <dbueso@suse.de>
Cc: Jason Baron <jbaron@akamai.com>
Link: http://lkml.kernel.org/r/20181106152226.20883-3-dave@stgolabs.net
[ Use inttypes.h to print rlim_t fields, fixing the build on Alpine Linux / musl libc ]
[ Check if eventfd() is available, i.e. if HAVE_EVENTFD is defined ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2018-11-06 15:22:26 +00:00
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*ctl*::
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Suite for evaluating multiple epoll_ctl calls.
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2020-04-02 15:43:53 +00:00
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SUITES FOR 'internals'
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~~~~~~~~~~~~~~~~~~~~~~
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*synthesize*::
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Suite for evaluating perf's event synthesis performance.
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2009-11-10 11:50:54 +00:00
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SEE ALSO
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--------
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linkperf:perf[1]
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