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    Subject[PATCH v2 1/4] perf bench: Add mem-memcpy.c:memcpy() benchmark
    Date
    This patch adds new file mem-memcpy.c.
    mem-memcpy.c is benchmark suite for measuring memcpy() performance.

    This patch is version 2.
    mem-memcpy.c of this version uses perf event systemcall to
    obtain clock cycle.

    Example of use:

    | % perf bench mem memcpy -l 1GB
    | # Running mem/memcpy benchmark...
    | # Copying 1GB Bytes from 0x7f0bf417d010 to 0x7f0c3417e010 ...
    |
    | 830.937491 MB/Sec
    | % perf bench mem memcpy -l 1GB -c
    | # Running mem/memcpy benchmark...
    | # Copying 1GB Bytes from 0x7f113fbf6010 to 0x7f117fbf7010 ...
    |
    | 3.259315 Clock/Byte

    Signed-off-by: Hitoshi Mitake <mitake@dcl.info.waseda.ac.jp>
    Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
    Cc: Paul Mackerras <paulus@samba.org>
    Cc: Frederic Weisbecker <fweisbec@gmail.com>
    Cc: Ling Ma <ling.ma@intel.com>
    ---
    tools/perf/bench/mem-memcpy.c | 196 +++++++++++++++++++++++++++++++++++++++++
    1 files changed, 196 insertions(+), 0 deletions(-)
    create mode 100644 tools/perf/bench/mem-memcpy.c

    diff --git a/tools/perf/bench/mem-memcpy.c b/tools/perf/bench/mem-memcpy.c
    new file mode 100644
    index 0000000..13266da
    --- /dev/null
    +++ b/tools/perf/bench/mem-memcpy.c
    @@ -0,0 +1,196 @@
    +/*
    + *
    + * mem-memcpy.c
    + *
    + * memcpy: Simple memory copy in various ways
    + *
    + * Based on memcpy.c by Ma Ling <ling.ma@intel.com>
    + * http://marc.info/?l=linux-kernel&m=125792321123782&w=2
    + * This memcpy.c is posted to LKML by Ma Ling for comparing
    + * two ways of memory copying.
    + * The thread is started from
    + * http://marc.info/?l=linux-kernel&m=125750023424093&w=2
    + *
    + * Ported to perf by Hitoshi Mitake <mitake@dcl.info.waseda.ac.jp>
    + *
    + */
    +
    +#include <ctype.h>
    +
    +#include "../perf.h"
    +#include "../util/util.h"
    +#include "../util/parse-options.h"
    +#include "../util/string.h"
    +#include "../util/header.h"
    +#include "bench.h"
    +
    +#include <stdio.h>
    +#include <stdlib.h>
    +#include <string.h>
    +#include <sys/time.h>
    +#include <errno.h>
    +
    +#define K 1024
    +
    +static const char *length_str = "1MB";
    +static const char *routine = "default";
    +static int use_clock = 0;
    +
    +static const struct option options[] = {
    + OPT_STRING('l', "length", &length_str, "1MB",
    + "Specify length of memory to copy. "
    + "available unit: B, MB, GB (upper and lower)"),
    + OPT_STRING('r', "routine", &routine, "default",
    + "Specify routine to copy"),
    + OPT_BOOLEAN('c', "clock", &use_clock,
    + "Use CPU clock for measuring"),
    + OPT_END()
    +};
    +
    +struct routine {
    + const char *name;
    + const char *desc;
    + void * (*fn)(void *dst, const void *src, size_t len);
    +};
    +
    +struct routine routines[] = {
    + { "default",
    + "Default memcpy() provided by glibc",
    + memcpy },
    + { NULL,
    + NULL,
    + NULL }
    +};
    +
    +static const char * const bench_mem_memcpy_usage[] = {
    + "perf bench mem memcpy <options>",
    + NULL
    +};
    +
    +static int clock_fd;
    +
    +static struct perf_event_attr clock_attr = {
    + .type = PERF_TYPE_HARDWARE,
    + .config = PERF_COUNT_HW_CPU_CYCLES
    +};
    +
    +static void init_clock(void)
    +{
    + clock_fd = sys_perf_event_open(&clock_attr, getpid(), -1, -1, 0);
    + BUG_ON(clock_fd < 0);
    +}
    +
    +static u64 get_clock(void)
    +{
    + int ret;
    + u64 clk;
    +
    + ret = read(clock_fd, &clk, sizeof(u64));
    + BUG_ON(ret != sizeof(u64));
    +
    + return clk;
    +}
    +
    +static double timeval2double(struct timeval *ts)
    +{
    + return (double)ts->tv_sec +
    + (double)ts->tv_usec / (double)1000000;
    +}
    +
    +int bench_mem_memcpy(int argc, const char **argv,
    + const char *prefix __used)
    +{
    + int i;
    + void *dst, *src;
    + size_t length;
    + double bps = 0.0;
    + struct timeval tv_start, tv_end, tv_diff;
    + u64 clock_start, clock_end, clock_diff;
    +
    + clock_start = clock_end = clock_diff = 0ULL;
    + argc = parse_options(argc, argv, options,
    + bench_mem_memcpy_usage, 0);
    +
    + tv_diff.tv_sec = 0;
    + tv_diff.tv_usec = 0;
    + length = (size_t)perf_atoll((char *)length_str);
    + if ((long long int)length <= 0) {
    + fprintf(stderr, "Invalid length:%s\n", length_str);
    + return 1;
    + }
    +
    + for (i = 0; routines[i].name; i++) {
    + if (!strcmp(routines[i].name, routine))
    + break;
    + }
    + if (!routines[i].name) {
    + printf("Unknown routine:%s\n", routine);
    + printf("Available routines...\n");
    + for (i = 0; routines[i].name; i++) {
    + printf("\t%s ... %s\n",
    + routines[i].name, routines[i].desc);
    + }
    + return 1;
    + }
    +
    + dst = calloc(length, sizeof(char));
    + assert(dst);
    + src = calloc(length, sizeof(char));
    + assert(src);
    +
    + if (bench_format == BENCH_FORMAT_DEFAULT) {
    + printf("# Copying %s Bytes from %p to %p ...\n\n",
    + length_str, src, dst);
    + }
    +
    + if (use_clock) {
    + init_clock();
    + clock_start = get_clock();
    + } else
    + BUG_ON(gettimeofday(&tv_start, NULL));
    +
    + routines[i].fn(dst, src, length);
    +
    + if (use_clock) {
    + clock_end = get_clock();
    + clock_diff = clock_end - clock_start;
    + } else {
    + BUG_ON(gettimeofday(&tv_end, NULL));
    + timersub(&tv_end, &tv_start, &tv_diff);
    + bps = (double)((double)length / timeval2double(&tv_diff));
    + }
    +
    + switch (bench_format) {
    + case BENCH_FORMAT_DEFAULT:
    + if (use_clock) {
    + printf(" %14lf Clock/Byte\n",
    + (double)clock_diff / (double)length);
    + } else {
    + if (bps < K)
    + printf(" %14lf B/sec\n", bps);
    + else if (bps < K * K)
    + printf(" %14lfd KB/sec\n", bps / 1024);
    + else if (bps < K * K * K)
    + printf(" %14lf MB/sec\n", bps / 1024 / 1024);
    + else {
    + printf(" %14lf GB/sec\n",
    + bps / 1024 / 1024 / 1024);
    + }
    + }
    + break;
    + case BENCH_FORMAT_SIMPLE:
    + if (use_clock) {
    + printf("%14lf\n",
    + (double)clock_diff / (double)length);
    + } else
    + printf("%lf\n", bps);
    + break;
    + default:
    + /* reaching here is something disaster */
    + fprintf(stderr, "Unknown format:%d\n", bench_format);
    + exit(1);
    + break;
    + }
    +
    + return 0;
    +}
    --
    1.6.5.2


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