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![Namhyung Kim](/assets/img/avatar_default.png)
Sometimes I can see that 'perf record' piped with 'perf inject' take a long time processing build-ids. So introduce a inject-build-id benchmark to the internals benchmark suite to measure its overhead regularly. It runs the 'perf inject' command internally and feeds the given number of synthesized events (MMAP2 + SAMPLE basically). Usage: perf bench internals inject-build-id <options> -i, --iterations <n> Number of iterations used to compute average (default: 100) -m, --nr-mmaps <n> Number of mmap events for each iteration (default: 100) -n, --nr-samples <n> Number of sample events per mmap event (default: 100) -v, --verbose be more verbose (show iteration count, DSO name, etc) By default, it measures average processing time of 100 MMAP2 events and 10000 SAMPLE events. Below is a result on my laptop. $ perf bench internals inject-build-id # Running 'internals/inject-build-id' benchmark: Average build-id injection took: 25.789 msec (+- 0.202 msec) Average time per event: 2.528 usec (+- 0.020 usec) Average memory usage: 8411 KB (+- 7 KB) Committer testing: $ perf bench Usage: perf bench [<common options>] <collection> <benchmark> [<options>] # List of all available benchmark collections: sched: Scheduler and IPC benchmarks syscall: System call benchmarks mem: Memory access benchmarks numa: NUMA scheduling and MM benchmarks futex: Futex stressing benchmarks epoll: Epoll stressing benchmarks internals: Perf-internals benchmarks all: All benchmarks $ perf bench internals # List of available benchmarks for collection 'internals': synthesize: Benchmark perf event synthesis kallsyms-parse: Benchmark kallsyms parsing inject-build-id: Benchmark build-id injection $ perf bench internals inject-build-id # Running 'internals/inject-build-id' benchmark: Average build-id injection took: 14.202 msec (+- 0.059 msec) Average time per event: 1.392 usec (+- 0.006 usec) Average memory usage: 12650 KB (+- 10 KB) Average build-id-all injection took: 12.831 msec (+- 0.071 msec) Average time per event: 1.258 usec (+- 0.007 usec) Average memory usage: 11895 KB (+- 10 KB) $ $ perf stat -r5 perf bench internals inject-build-id # Running 'internals/inject-build-id' benchmark: Average build-id injection took: 14.380 msec (+- 0.056 msec) Average time per event: 1.410 usec (+- 0.006 usec) Average memory usage: 12608 KB (+- 11 KB) Average build-id-all injection took: 11.889 msec (+- 0.064 msec) Average time per event: 1.166 usec (+- 0.006 usec) Average memory usage: 11838 KB (+- 10 KB) # Running 'internals/inject-build-id' benchmark: Average build-id injection took: 14.246 msec (+- 0.065 msec) Average time per event: 1.397 usec (+- 0.006 usec) Average memory usage: 12744 KB (+- 10 KB) Average build-id-all injection took: 12.019 msec (+- 0.066 msec) Average time per event: 1.178 usec (+- 0.006 usec) Average memory usage: 11963 KB (+- 10 KB) # Running 'internals/inject-build-id' benchmark: Average build-id injection took: 14.321 msec (+- 0.067 msec) Average time per event: 1.404 usec (+- 0.007 usec) Average memory usage: 12690 KB (+- 10 KB) Average build-id-all injection took: 11.909 msec (+- 0.041 msec) Average time per event: 1.168 usec (+- 0.004 usec) Average memory usage: 11938 KB (+- 10 KB) # Running 'internals/inject-build-id' benchmark: Average build-id injection took: 14.287 msec (+- 0.059 msec) Average time per event: 1.401 usec (+- 0.006 usec) Average memory usage: 12864 KB (+- 10 KB) Average build-id-all injection took: 11.862 msec (+- 0.058 msec) Average time per event: 1.163 usec (+- 0.006 usec) Average memory usage: 12103 KB (+- 10 KB) # Running 'internals/inject-build-id' benchmark: Average build-id injection took: 14.402 msec (+- 0.053 msec) Average time per event: 1.412 usec (+- 0.005 usec) Average memory usage: 12876 KB (+- 10 KB) Average build-id-all injection took: 11.826 msec (+- 0.061 msec) Average time per event: 1.159 usec (+- 0.006 usec) Average memory usage: 12111 KB (+- 10 KB) Performance counter stats for 'perf bench internals inject-build-id' (5 runs): 4,267.48 msec task-clock:u # 1.502 CPUs utilized ( +- 0.14% ) 0 context-switches:u # 0.000 K/sec 0 cpu-migrations:u # 0.000 K/sec 102,092 page-faults:u # 0.024 M/sec ( +- 0.08% ) 3,894,589,578 cycles:u # 0.913 GHz ( +- 0.19% ) (83.49%) 140,078,421 stalled-cycles-frontend:u # 3.60% frontend cycles idle ( +- 0.77% ) (83.34%) 948,581,189 stalled-cycles-backend:u # 24.36% backend cycles idle ( +- 0.46% ) (83.25%) 5,835,587,719 instructions:u # 1.50 insn per cycle # 0.16 stalled cycles per insn ( +- 0.21% ) (83.24%) 1,267,423,636 branches:u # 296.996 M/sec ( +- 0.22% ) (83.12%) 17,484,290 branch-misses:u # 1.38% of all branches ( +- 0.12% ) (83.55%) 2.84176 +- 0.00222 seconds time elapsed ( +- 0.08% ) $ Acked-by: Jiri Olsa <jolsa@redhat.com> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: Namhyung Kim <namhyung@kernel.org> Link: https://lore.kernel.org/r/20201012070214.2074921-2-namhyung@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
322 lines
8.1 KiB
C
322 lines
8.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* builtin-bench.c
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*
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* General benchmarking collections provided by perf
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*
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* Copyright (C) 2009, Hitoshi Mitake <mitake@dcl.info.waseda.ac.jp>
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*/
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/*
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* Available benchmark collection list:
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*
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* sched ... scheduler and IPC performance
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* syscall ... System call performance
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* mem ... memory access performance
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* numa ... NUMA scheduling and MM performance
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* futex ... Futex performance
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* epoll ... Event poll performance
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*/
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#include <subcmd/parse-options.h>
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#include "builtin.h"
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#include "bench/bench.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/prctl.h>
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#include <linux/zalloc.h>
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typedef int (*bench_fn_t)(int argc, const char **argv);
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struct bench {
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const char *name;
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const char *summary;
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bench_fn_t fn;
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};
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#ifdef HAVE_LIBNUMA_SUPPORT
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static struct bench numa_benchmarks[] = {
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{ "mem", "Benchmark for NUMA workloads", bench_numa },
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{ "all", "Run all NUMA benchmarks", NULL },
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{ NULL, NULL, NULL }
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};
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#endif
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static struct bench sched_benchmarks[] = {
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{ "messaging", "Benchmark for scheduling and IPC", bench_sched_messaging },
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{ "pipe", "Benchmark for pipe() between two processes", bench_sched_pipe },
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{ "all", "Run all scheduler benchmarks", NULL },
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{ NULL, NULL, NULL }
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};
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static struct bench syscall_benchmarks[] = {
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{ "basic", "Benchmark for basic getppid(2) calls", bench_syscall_basic },
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{ "all", "Run all syscall benchmarks", NULL },
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{ NULL, NULL, NULL },
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};
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static struct bench mem_benchmarks[] = {
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{ "memcpy", "Benchmark for memcpy() functions", bench_mem_memcpy },
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{ "memset", "Benchmark for memset() functions", bench_mem_memset },
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{ "find_bit", "Benchmark for find_bit() functions", bench_mem_find_bit },
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{ "all", "Run all memory access benchmarks", NULL },
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{ NULL, NULL, NULL }
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};
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static struct bench futex_benchmarks[] = {
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{ "hash", "Benchmark for futex hash table", bench_futex_hash },
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{ "wake", "Benchmark for futex wake calls", bench_futex_wake },
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{ "wake-parallel", "Benchmark for parallel futex wake calls", bench_futex_wake_parallel },
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{ "requeue", "Benchmark for futex requeue calls", bench_futex_requeue },
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/* pi-futexes */
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{ "lock-pi", "Benchmark for futex lock_pi calls", bench_futex_lock_pi },
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{ "all", "Run all futex benchmarks", NULL },
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{ NULL, NULL, NULL }
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};
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#ifdef HAVE_EVENTFD_SUPPORT
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static struct bench epoll_benchmarks[] = {
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{ "wait", "Benchmark epoll concurrent epoll_waits", bench_epoll_wait },
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{ "ctl", "Benchmark epoll concurrent epoll_ctls", bench_epoll_ctl },
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{ "all", "Run all futex benchmarks", NULL },
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{ NULL, NULL, NULL }
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};
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#endif // HAVE_EVENTFD_SUPPORT
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static struct bench internals_benchmarks[] = {
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{ "synthesize", "Benchmark perf event synthesis", bench_synthesize },
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{ "kallsyms-parse", "Benchmark kallsyms parsing", bench_kallsyms_parse },
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{ "inject-build-id", "Benchmark build-id injection", bench_inject_build_id },
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{ NULL, NULL, NULL }
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};
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struct collection {
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const char *name;
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const char *summary;
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struct bench *benchmarks;
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};
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static struct collection collections[] = {
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{ "sched", "Scheduler and IPC benchmarks", sched_benchmarks },
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{ "syscall", "System call benchmarks", syscall_benchmarks },
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{ "mem", "Memory access benchmarks", mem_benchmarks },
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#ifdef HAVE_LIBNUMA_SUPPORT
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{ "numa", "NUMA scheduling and MM benchmarks", numa_benchmarks },
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#endif
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{"futex", "Futex stressing benchmarks", futex_benchmarks },
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#ifdef HAVE_EVENTFD_SUPPORT
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{"epoll", "Epoll stressing benchmarks", epoll_benchmarks },
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#endif
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{ "internals", "Perf-internals benchmarks", internals_benchmarks },
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{ "all", "All benchmarks", NULL },
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{ NULL, NULL, NULL }
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};
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/* Iterate over all benchmark collections: */
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#define for_each_collection(coll) \
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for (coll = collections; coll->name; coll++)
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/* Iterate over all benchmarks within a collection: */
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#define for_each_bench(coll, bench) \
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for (bench = coll->benchmarks; bench && bench->name; bench++)
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static void dump_benchmarks(struct collection *coll)
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{
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struct bench *bench;
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printf("\n # List of available benchmarks for collection '%s':\n\n", coll->name);
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for_each_bench(coll, bench)
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printf("%14s: %s\n", bench->name, bench->summary);
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printf("\n");
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}
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static const char *bench_format_str;
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/* Output/formatting style, exported to benchmark modules: */
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int bench_format = BENCH_FORMAT_DEFAULT;
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unsigned int bench_repeat = 10; /* default number of times to repeat the run */
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static const struct option bench_options[] = {
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OPT_STRING('f', "format", &bench_format_str, "default|simple", "Specify the output formatting style"),
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OPT_UINTEGER('r', "repeat", &bench_repeat, "Specify amount of times to repeat the run"),
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OPT_END()
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};
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static const char * const bench_usage[] = {
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"perf bench [<common options>] <collection> <benchmark> [<options>]",
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NULL
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};
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static void print_usage(void)
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{
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struct collection *coll;
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int i;
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printf("Usage: \n");
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for (i = 0; bench_usage[i]; i++)
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printf("\t%s\n", bench_usage[i]);
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printf("\n");
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printf(" # List of all available benchmark collections:\n\n");
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for_each_collection(coll)
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printf("%14s: %s\n", coll->name, coll->summary);
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printf("\n");
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}
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static int bench_str2int(const char *str)
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{
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if (!str)
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return BENCH_FORMAT_DEFAULT;
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if (!strcmp(str, BENCH_FORMAT_DEFAULT_STR))
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return BENCH_FORMAT_DEFAULT;
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else if (!strcmp(str, BENCH_FORMAT_SIMPLE_STR))
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return BENCH_FORMAT_SIMPLE;
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return BENCH_FORMAT_UNKNOWN;
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}
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/*
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* Run a specific benchmark but first rename the running task's ->comm[]
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* to something meaningful:
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*/
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static int run_bench(const char *coll_name, const char *bench_name, bench_fn_t fn,
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int argc, const char **argv)
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{
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int size;
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char *name;
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int ret;
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size = strlen(coll_name) + 1 + strlen(bench_name) + 1;
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name = zalloc(size);
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BUG_ON(!name);
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scnprintf(name, size, "%s-%s", coll_name, bench_name);
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prctl(PR_SET_NAME, name);
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argv[0] = name;
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ret = fn(argc, argv);
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free(name);
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return ret;
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}
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static void run_collection(struct collection *coll)
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{
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struct bench *bench;
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const char *argv[2];
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argv[1] = NULL;
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/*
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* TODO:
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*
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* Preparing preset parameters for
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* embedded, ordinary PC, HPC, etc...
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* would be helpful.
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*/
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for_each_bench(coll, bench) {
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if (!bench->fn)
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break;
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printf("# Running %s/%s benchmark...\n", coll->name, bench->name);
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fflush(stdout);
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argv[1] = bench->name;
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run_bench(coll->name, bench->name, bench->fn, 1, argv);
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printf("\n");
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}
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}
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static void run_all_collections(void)
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{
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struct collection *coll;
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for_each_collection(coll)
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run_collection(coll);
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}
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int cmd_bench(int argc, const char **argv)
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{
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struct collection *coll;
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int ret = 0;
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if (argc < 2) {
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/* No collection specified. */
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print_usage();
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goto end;
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}
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argc = parse_options(argc, argv, bench_options, bench_usage,
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PARSE_OPT_STOP_AT_NON_OPTION);
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bench_format = bench_str2int(bench_format_str);
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if (bench_format == BENCH_FORMAT_UNKNOWN) {
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printf("Unknown format descriptor: '%s'\n", bench_format_str);
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goto end;
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}
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if (bench_repeat == 0) {
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printf("Invalid repeat option: Must specify a positive value\n");
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goto end;
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}
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if (argc < 1) {
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print_usage();
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goto end;
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}
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if (!strcmp(argv[0], "all")) {
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run_all_collections();
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goto end;
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}
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for_each_collection(coll) {
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struct bench *bench;
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if (strcmp(coll->name, argv[0]))
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continue;
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if (argc < 2) {
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/* No bench specified. */
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dump_benchmarks(coll);
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goto end;
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}
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if (!strcmp(argv[1], "all")) {
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run_collection(coll);
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goto end;
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}
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for_each_bench(coll, bench) {
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if (strcmp(bench->name, argv[1]))
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continue;
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if (bench_format == BENCH_FORMAT_DEFAULT)
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printf("# Running '%s/%s' benchmark:\n", coll->name, bench->name);
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fflush(stdout);
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ret = run_bench(coll->name, bench->name, bench->fn, argc-1, argv+1);
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goto end;
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}
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if (!strcmp(argv[1], "-h") || !strcmp(argv[1], "--help")) {
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dump_benchmarks(coll);
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goto end;
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}
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printf("Unknown benchmark: '%s' for collection '%s'\n", argv[1], argv[0]);
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ret = 1;
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goto end;
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}
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printf("Unknown collection: '%s'\n", argv[0]);
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ret = 1;
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end:
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return ret;
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}
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