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 number 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.

       uprobe
           Benchmark overhead of uprobe + BPF.

       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.

           -G, --cgroups=
               Names of cgroups for sender and receiver, separated by a comma. This is useful to
               check cgroup context switching overhead. Note that perf doesn’t create nor delete
               the cgroups, so users should make sure that the cgroups exist and are accessible
               before use.

       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

               % perf bench sched pipe -G AAA,BBB
               (executing 1000000 pipe operations between cgroups)
               # Running 'sched/pipe' benchmark:
               # Executed 1000000 pipe operations between two processes

                    Total time: 6.886 [sec]

                      6.886208 usecs/op
                        145217 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.

   SUITES FOR numa
       mem
           Suite for evaluating NUMA workloads.

   SUITES FOR futex
       hash
           Suite for evaluating hash tables.

       wake
           Suite for evaluating wake calls.

       wake-parallel
           Suite for evaluating parallel wake calls.

       requeue
           Suite for evaluating requeue calls.

       lock-pi
           Suite for evaluating futex lock_pi calls.

   SUITES FOR epoll
       wait
           Suite for evaluating concurrent epoll_wait calls.

       ctl
           Suite for evaluating multiple epoll_ctl calls.

   SUITES FOR internals
       synthesize
           Suite for evaluating perf’s event synthesis performance.

SEE ALSO

       perf(1)