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c2a0820305
The usefulness of having a standard way of testing syscall performance has come up from time to time[0]. Furthermore, some of our testing machinery (such as 'mmtests') already makes use of a simplified version of the microbenchmark. This patch mainly takes the same idea to measure syscall throughput compatible with 'perf-bench' via getppid(2), yet without any of the additional template stuff from Ingo's version (based on numa.c). The code is identical to what mmtests uses. [0] https://lore.kernel.org/lkml/20160201074156.GA27156@gmail.com/ Committer notes: Add mising stdlib.h and unistd.h to get the prototypes for exit() and getppid(). 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 syscall # List of available benchmarks for collection 'syscall': basic: Benchmark for basic getppid(2) calls all: Run all syscall benchmarks $ perf bench syscall basic # Running 'syscall/basic' benchmark: # Executed 10000000 getppid() calls Total time: 3.679 [sec] 0.367957 usecs/op 2717708 ops/sec $ perf bench syscall all # Running syscall/basic benchmark... # Executed 10000000 getppid() calls Total time: 3.644 [sec] 0.364456 usecs/op 2743815 ops/sec $ Signed-off-by: Davidlohr Bueso <dbueso@suse.de> Acked-by: Josh Poimboeuf <jpoimboe@redhat.com> Acked-by: Mel Gorman <mgorman@techsingularity.net> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Link: http://lore.kernel.org/lkml/20190308181747.l36zqz2avtivrr3c@linux-r8p5 Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
81 lines
1.7 KiB
C
81 lines
1.7 KiB
C
/*
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*
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* syscall.c
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*
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* syscall: Benchmark for system call performance
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*/
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#include "../perf.h"
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#include "../util/util.h"
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#include <subcmd/parse-options.h>
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#include "../builtin.h"
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#include "bench.h"
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#include <stdio.h>
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#include <sys/time.h>
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#include <sys/syscall.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <stdlib.h>
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#define LOOPS_DEFAULT 10000000
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static int loops = LOOPS_DEFAULT;
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static const struct option options[] = {
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OPT_INTEGER('l', "loop", &loops, "Specify number of loops"),
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OPT_END()
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};
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static const char * const bench_syscall_usage[] = {
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"perf bench syscall <options>",
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NULL
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};
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int bench_syscall_basic(int argc, const char **argv)
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{
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struct timeval start, stop, diff;
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unsigned long long result_usec = 0;
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int i;
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argc = parse_options(argc, argv, options, bench_syscall_usage, 0);
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gettimeofday(&start, NULL);
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for (i = 0; i < loops; i++)
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getppid();
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gettimeofday(&stop, NULL);
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timersub(&stop, &start, &diff);
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switch (bench_format) {
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case BENCH_FORMAT_DEFAULT:
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printf("# Executed %'d getppid() calls\n", loops);
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result_usec = diff.tv_sec * 1000000;
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result_usec += diff.tv_usec;
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printf(" %14s: %lu.%03lu [sec]\n\n", "Total time",
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diff.tv_sec,
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(unsigned long) (diff.tv_usec/1000));
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printf(" %14lf usecs/op\n",
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(double)result_usec / (double)loops);
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printf(" %'14d ops/sec\n",
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(int)((double)loops /
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((double)result_usec / (double)1000000)));
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break;
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case BENCH_FORMAT_SIMPLE:
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printf("%lu.%03lu\n",
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diff.tv_sec,
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(unsigned long) (diff.tv_usec / 1000));
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break;
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default:
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/* reaching here is something disaster */
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fprintf(stderr, "Unknown format:%d\n", bench_format);
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exit(1);
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break;
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}
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return 0;
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}
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