Messages in this thread Patch in this message | | | Date | Fri, 8 Mar 2019 10:17:47 -0800 | From | Davidlohr Bueso <> | Subject | Re: [PATCH] tools/perf-bench: Add basic syscall benchmark |
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On Thu, 07 Mar 2019, Arnaldo Carvalho de Melo wrote: >You forgot to update tools/perf/Documentation/perf-bench.txt, and please >take a look at tools/perf/util/pmu.c convert_scale() to see how to save >the current locale, set the one you want, then restore the previous one, >so that at the end of this benchmark the environment is back to where it >was.
Here's an updated version with the corresponding docs, but I removed the setlocale() - doesn't seem worth it; I hope Mel has no strong objection.
Thanks.
-------8<---------------------------------------------------------- [PATCH v2] tools/perf-bench: Add basic syscall benchmark
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/
Signed-off-by: Davidlohr Bueso <dbueso@suse.de> --- tools/perf/Documentation/perf-bench.txt | 11 +++++ tools/perf/bench/Build | 1 + tools/perf/bench/bench.h | 1 + tools/perf/bench/syscall.c | 78 +++++++++++++++++++++++++++++++++ tools/perf/builtin-bench.c | 8 ++++ 5 files changed, 99 insertions(+) create mode 100644 tools/perf/bench/syscall.c
diff --git a/tools/perf/Documentation/perf-bench.txt b/tools/perf/Documentation/perf-bench.txt index 0921a3c67381..8093cafc530a 100644 --- a/tools/perf/Documentation/perf-bench.txt +++ b/tools/perf/Documentation/perf-bench.txt @@ -49,6 +49,9 @@ SUBSYSTEM 'sched':: Scheduler and IPC mechanisms. +'syscall':: + System call performance (throughput). + 'mem':: Memory access performance. @@ -134,6 +137,14 @@ Example of *pipe* 59004 ops/sec --------------------- +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*:: diff --git a/tools/perf/bench/Build b/tools/perf/bench/Build index e4e321b6f883..839f9b790587 100644 --- a/tools/perf/bench/Build +++ b/tools/perf/bench/Build @@ -1,5 +1,6 @@ perf-y += sched-messaging.o perf-y += sched-pipe.o +perf-y += syscall.o perf-y += mem-functions.o perf-y += futex-hash.o perf-y += futex-wake.o diff --git a/tools/perf/bench/bench.h b/tools/perf/bench/bench.h index fddb3ced9db6..31ad3283d41b 100644 --- a/tools/perf/bench/bench.h +++ b/tools/perf/bench/bench.h @@ -29,6 +29,7 @@ int bench_numa(int argc, const char **argv); int bench_sched_messaging(int argc, const char **argv); int bench_sched_pipe(int argc, const char **argv); +int bench_syscall_basic(int argc, const char **argv); int bench_mem_memcpy(int argc, const char **argv); int bench_mem_memset(int argc, const char **argv); int bench_futex_hash(int argc, const char **argv); diff --git a/tools/perf/bench/syscall.c b/tools/perf/bench/syscall.c new file mode 100644 index 000000000000..409f84a4fe4f --- /dev/null +++ b/tools/perf/bench/syscall.c @@ -0,0 +1,78 @@ +/* + * + * syscall.c + * + * syscall: Benchmark for system call performance + */ +#include "../perf.h" +#include "../util/util.h" +#include <subcmd/parse-options.h> +#include "../builtin.h" +#include "bench.h" + +#include <stdio.h> +#include <sys/time.h> +#include <sys/syscall.h> + +#define LOOPS_DEFAULT 10000000 +static int loops = LOOPS_DEFAULT; + +static const struct option options[] = { + OPT_INTEGER('l', "loop", &loops, "Specify number of loops"), + OPT_END() +}; + +static const char * const bench_syscall_usage[] = { + "perf bench syscall <options>", + NULL +}; + +int bench_syscall_basic(int argc, const char **argv) +{ + struct timeval start, stop, diff; + unsigned long long result_usec = 0; + int i; + + argc = parse_options(argc, argv, options, bench_syscall_usage, 0); + + gettimeofday(&start, NULL); + + for (i = 0; i < loops; i++) + getppid(); + + gettimeofday(&stop, NULL); + timersub(&stop, &start, &diff); + + switch (bench_format) { + case BENCH_FORMAT_DEFAULT: + printf("# Executed %'d getppid() calls\n", loops); + + result_usec = diff.tv_sec * 1000000; + result_usec += diff.tv_usec; + + printf(" %14s: %lu.%03lu [sec]\n\n", "Total time", + diff.tv_sec, + (unsigned long) (diff.tv_usec/1000)); + + printf(" %14lf usecs/op\n", + (double)result_usec / (double)loops); + printf(" %'14d ops/sec\n", + (int)((double)loops / + ((double)result_usec / (double)1000000))); + break; + + case BENCH_FORMAT_SIMPLE: + printf("%lu.%03lu\n", + diff.tv_sec, + (unsigned long) (diff.tv_usec / 1000)); + break; + + default: + /* reaching here is something disaster */ + fprintf(stderr, "Unknown format:%d\n", bench_format); + exit(1); + break; + } + + return 0; +} diff --git a/tools/perf/builtin-bench.c b/tools/perf/builtin-bench.c index 334c77ffc1d9..017029765404 100644 --- a/tools/perf/builtin-bench.c +++ b/tools/perf/builtin-bench.c @@ -11,6 +11,7 @@ * Available benchmark collection list: * * sched ... scheduler and IPC performance + * syscall ... System call performance * mem ... memory access performance * numa ... NUMA scheduling and MM performance * futex ... Futex performance @@ -50,6 +51,12 @@ static struct bench sched_benchmarks[] = { { NULL, NULL, NULL } }; +static struct bench syscall_benchmarks[] = { + { "basic", "Benchmark for basic getppid(2) calls", bench_syscall_basic }, + { "all", "Run all syscall benchmarks", NULL }, + { NULL, NULL, NULL }, +}; + static struct bench mem_benchmarks[] = { { "memcpy", "Benchmark for memcpy() functions", bench_mem_memcpy }, { "memset", "Benchmark for memset() functions", bench_mem_memset }, @@ -85,6 +92,7 @@ struct collection { static struct collection collections[] = { { "sched", "Scheduler and IPC benchmarks", sched_benchmarks }, + { "syscall", "System call benchmarks", syscall_benchmarks }, { "mem", "Memory access benchmarks", mem_benchmarks }, #ifdef HAVE_LIBNUMA_SUPPORT { "numa", "NUMA scheduling and MM benchmarks", numa_benchmarks }, -- 2.16.4
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