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/*
* mem-memcpy.c
*
* memcpy: Simple memory copy in various ways
*
* Written 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/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 bool use_clock = false;
static int clock_fd;
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 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);
if (clock_fd < 0 && errno == ENOSYS)
die("No CONFIG_PERF_EVENTS=y kernel support configured?\n");
else
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 ((s64)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 = zalloc(length);
if (!dst)
die("memory allocation failed - maybe length is too large?\n");
src = zalloc(length);
if (!src)
die("memory allocation failed - maybe length is too large?\n");
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 this means there's some disaster: */
die("unknown format: %d\n", bench_format);
break;
}
return 0;
}
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