1 perf-bench(1) 2 ============= 3 4 NAME 5 ---- 6 perf-bench - General framework for benchmark suites 7 8 SYNOPSIS 9 -------- 10 [verse] 11 'perf bench' [<common options>] <subsystem> <suite> [<options>] 12 13 DESCRIPTION 14 ----------- 15 This 'perf bench' command is a general framework for benchmark suites. 16 17 COMMON OPTIONS 18 -------------- 19 -r:: 20 --repeat=:: 21 Specify number of times to repeat the run (default 10). 22 23 -f:: 24 --format=:: 25 Specify format style. 26 Current available format styles are: 27 28 'default':: 29 Default style. This is mainly for human reading. 30 --------------------- 31 % perf bench sched pipe # with no style specified 32 (executing 1000000 pipe operations between two tasks) 33 Total time:5.855 sec 34 5.855061 usecs/op 35 170792 ops/sec 36 --------------------- 37 38 'simple':: 39 This simple style is friendly for automated 40 processing by scripts. 41 --------------------- 42 % perf bench --format=simple sched pipe # specified simple 43 5.988 44 --------------------- 45 46 SUBSYSTEM 47 --------- 48 49 'sched':: 50 Scheduler and IPC mechanisms. 51 52 'syscall':: 53 System call performance (throughput). 54 55 'mem':: 56 Memory access performance. 57 58 'numa':: 59 NUMA scheduling and MM benchmarks. 60 61 'futex':: 62 Futex stressing benchmarks. 63 64 'epoll':: 65 Eventpoll (epoll) stressing benchmarks. 66 67 'internals':: 68 Benchmark internal perf functionality. 69 70 'uprobe':: 71 Benchmark overhead of uprobe + BPF. 72 73 'all':: 74 All benchmark subsystems. 75 76 SUITES FOR 'sched' 77 ~~~~~~~~~~~~~~~~~~ 78 *messaging*:: 79 Suite for evaluating performance of scheduler and IPC mechanisms. 80 Based on hackbench by Rusty Russell. 81 82 Options of *messaging* 83 ^^^^^^^^^^^^^^^^^^^^^^ 84 -p:: 85 --pipe:: 86 Use pipe() instead of socketpair() 87 88 -t:: 89 --thread:: 90 Be multi thread instead of multi process 91 92 -g:: 93 --group=:: 94 Specify number of groups 95 96 -l:: 97 --nr_loops=:: 98 Specify number of loops 99 100 Example of *messaging* 101 ^^^^^^^^^^^^^^^^^^^^^^ 102 103 --------------------- 104 % perf bench sched messaging # run with default 105 options (20 sender and receiver processes per group) 106 (10 groups == 400 processes run) 107 108 Total time:0.308 sec 109 110 % perf bench sched messaging -t -g 20 # be multi-thread, with 20 groups 111 (20 sender and receiver threads per group) 112 (20 groups == 800 threads run) 113 114 Total time:0.582 sec 115 --------------------- 116 117 *pipe*:: 118 Suite for pipe() system call. 119 Based on pipe-test-1m.c by Ingo Molnar. 120 121 Options of *pipe* 122 ^^^^^^^^^^^^^^^^^ 123 -l:: 124 --loop=:: 125 Specify number of loops. 126 127 -G:: 128 --cgroups=:: 129 Names of cgroups for sender and receiver, separated by a comma. 130 This is useful to check cgroup context switching overhead. 131 Note that perf doesn't create nor delete the cgroups, so users should 132 make sure that the cgroups exist and are accessible before use. 133 134 135 Example of *pipe* 136 ^^^^^^^^^^^^^^^^^ 137 138 --------------------- 139 % perf bench sched pipe 140 (executing 1000000 pipe operations between two tasks) 141 142 Total time:8.091 sec 143 8.091833 usecs/op 144 123581 ops/sec 145 146 % perf bench sched pipe -l 1000 # loop 1000 147 (executing 1000 pipe operations between two tasks) 148 149 Total time:0.016 sec 150 16.948000 usecs/op 151 59004 ops/sec 152 153 % perf bench sched pipe -G AAA,BBB 154 (executing 1000000 pipe operations between cgroups) 155 # Running 'sched/pipe' benchmark: 156 # Executed 1000000 pipe operations between two processes 157 158 Total time: 6.886 [sec] 159 160 6.886208 usecs/op 161 145217 ops/sec 162 163 --------------------- 164 165 SUITES FOR 'syscall' 166 ~~~~~~~~~~~~~~~~~~ 167 *basic*:: 168 Suite for evaluating performance of core system call throughput (both usecs/op and ops/sec metrics). 169 This uses a single thread simply doing getppid(2), which is a simple syscall where the result is not 170 cached by glibc. 171 172 173 SUITES FOR 'mem' 174 ~~~~~~~~~~~~~~~~ 175 *memcpy*:: 176 Suite for evaluating performance of simple memory copy in various ways. 177 178 Options of *memcpy* 179 ^^^^^^^^^^^^^^^^^^^ 180 -l:: 181 --size:: 182 Specify size of memory to copy (default: 1MB). 183 Available units are B, KB, MB, GB and TB (case insensitive). 184 185 -f:: 186 --function:: 187 Specify function to copy (default: default). 188 Available functions are depend on the architecture. 189 On x86-64, x86-64-unrolled, x86-64-movsq and x86-64-movsb are supported. 190 191 -l:: 192 --nr_loops:: 193 Repeat memcpy invocation this number of times. 194 195 -c:: 196 --cycles:: 197 Use perf's cpu-cycles event instead of gettimeofday syscall. 198 199 *memset*:: 200 Suite for evaluating performance of simple memory set in various ways. 201 202 Options of *memset* 203 ^^^^^^^^^^^^^^^^^^^ 204 -l:: 205 --size:: 206 Specify size of memory to set (default: 1MB). 207 Available units are B, KB, MB, GB and TB (case insensitive). 208 209 -f:: 210 --function:: 211 Specify function to set (default: default). 212 Available functions are depend on the architecture. 213 On x86-64, x86-64-unrolled, x86-64-stosq and x86-64-stosb are supported. 214 215 -l:: 216 --nr_loops:: 217 Repeat memset invocation this number of times. 218 219 -c:: 220 --cycles:: 221 Use perf's cpu-cycles event instead of gettimeofday syscall. 222 223 SUITES FOR 'numa' 224 ~~~~~~~~~~~~~~~~~ 225 *mem*:: 226 Suite for evaluating NUMA workloads. 227 228 SUITES FOR 'futex' 229 ~~~~~~~~~~~~~~~~~~ 230 *hash*:: 231 Suite for evaluating hash tables. 232 233 *wake*:: 234 Suite for evaluating wake calls. 235 236 *wake-parallel*:: 237 Suite for evaluating parallel wake calls. 238 239 *requeue*:: 240 Suite for evaluating requeue calls. 241 242 *lock-pi*:: 243 Suite for evaluating futex lock_pi calls. 244 245 SUITES FOR 'epoll' 246 ~~~~~~~~~~~~~~~~~~ 247 *wait*:: 248 Suite for evaluating concurrent epoll_wait calls. 249 250 *ctl*:: 251 Suite for evaluating multiple epoll_ctl calls. 252 253 SUITES FOR 'internals' 254 ~~~~~~~~~~~~~~~~~~~~~~ 255 *synthesize*:: 256 Suite for evaluating perf's event synthesis performance. 257 258 SEE ALSO 259 -------- 260 linkperf:perf[1]
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