306 lines
6.8 KiB
C
306 lines
6.8 KiB
C
/*
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* mem-memcpy.c
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*
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* memcpy: Simple memory copy in various ways
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*
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* Written by Hitoshi Mitake <mitake@dcl.info.waseda.ac.jp>
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*/
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#include "../perf.h"
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#include "../util/util.h"
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#include "../util/parse-options.h"
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#include "../util/header.h"
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#include "bench.h"
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#include "mem-memcpy-arch.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/time.h>
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#include <errno.h>
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#define K 1024
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static const char *length_str = "1MB";
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static const char *routine = "default";
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static int iterations = 1;
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static bool use_cycle;
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static int cycle_fd;
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static bool only_prefault;
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static bool no_prefault;
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static const struct option options[] = {
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OPT_STRING('l', "length", &length_str, "1MB",
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"Specify length of memory to copy. "
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"Available units: B, KB, MB, GB and TB (upper and lower)"),
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OPT_STRING('r', "routine", &routine, "default",
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"Specify routine to copy"),
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OPT_INTEGER('i', "iterations", &iterations,
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"repeat memcpy() invocation this number of times"),
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OPT_BOOLEAN('c', "cycle", &use_cycle,
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"Use cycles event instead of gettimeofday() for measuring"),
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OPT_BOOLEAN('o', "only-prefault", &only_prefault,
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"Show only the result with page faults before memcpy()"),
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OPT_BOOLEAN('n', "no-prefault", &no_prefault,
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"Show only the result without page faults before memcpy()"),
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OPT_END()
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};
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typedef void *(*memcpy_t)(void *, const void *, size_t);
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struct routine {
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const char *name;
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const char *desc;
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memcpy_t fn;
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};
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struct routine routines[] = {
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{ "default",
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"Default memcpy() provided by glibc",
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memcpy },
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#ifdef HAVE_ARCH_X86_64_SUPPORT
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#define MEMCPY_FN(fn, name, desc) { name, desc, fn },
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#include "mem-memcpy-x86-64-asm-def.h"
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#undef MEMCPY_FN
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#endif
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{ NULL,
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NULL,
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NULL }
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};
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static const char * const bench_mem_memcpy_usage[] = {
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"perf bench mem memcpy <options>",
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NULL
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};
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static struct perf_event_attr cycle_attr = {
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.type = PERF_TYPE_HARDWARE,
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.config = PERF_COUNT_HW_CPU_CYCLES
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};
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static void init_cycle(void)
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{
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cycle_fd = sys_perf_event_open(&cycle_attr, getpid(), -1, -1, 0);
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if (cycle_fd < 0 && errno == ENOSYS)
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die("No CONFIG_PERF_EVENTS=y kernel support configured?\n");
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else
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BUG_ON(cycle_fd < 0);
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}
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static u64 get_cycle(void)
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{
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int ret;
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u64 clk;
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ret = read(cycle_fd, &clk, sizeof(u64));
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BUG_ON(ret != sizeof(u64));
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return clk;
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}
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static double timeval2double(struct timeval *ts)
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{
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return (double)ts->tv_sec +
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(double)ts->tv_usec / (double)1000000;
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}
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static void alloc_mem(void **dst, void **src, size_t length)
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{
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*dst = zalloc(length);
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if (!*dst)
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die("memory allocation failed - maybe length is too large?\n");
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*src = zalloc(length);
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if (!*src)
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die("memory allocation failed - maybe length is too large?\n");
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/* Make sure to always replace the zero pages even if MMAP_THRESH is crossed */
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memset(*src, 0, length);
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}
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static u64 do_memcpy_cycle(memcpy_t fn, size_t len, bool prefault)
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{
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u64 cycle_start = 0ULL, cycle_end = 0ULL;
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void *src = NULL, *dst = NULL;
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int i;
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alloc_mem(&src, &dst, len);
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if (prefault)
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fn(dst, src, len);
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cycle_start = get_cycle();
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for (i = 0; i < iterations; ++i)
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fn(dst, src, len);
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cycle_end = get_cycle();
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free(src);
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free(dst);
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return cycle_end - cycle_start;
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}
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static double do_memcpy_gettimeofday(memcpy_t fn, size_t len, bool prefault)
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{
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struct timeval tv_start, tv_end, tv_diff;
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void *src = NULL, *dst = NULL;
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int i;
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alloc_mem(&src, &dst, len);
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if (prefault)
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fn(dst, src, len);
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BUG_ON(gettimeofday(&tv_start, NULL));
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for (i = 0; i < iterations; ++i)
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fn(dst, src, len);
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BUG_ON(gettimeofday(&tv_end, NULL));
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timersub(&tv_end, &tv_start, &tv_diff);
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free(src);
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free(dst);
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return (double)((double)len / timeval2double(&tv_diff));
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}
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#define pf (no_prefault ? 0 : 1)
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#define print_bps(x) do { \
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if (x < K) \
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printf(" %14lf B/Sec", x); \
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else if (x < K * K) \
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printf(" %14lfd KB/Sec", x / K); \
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else if (x < K * K * K) \
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printf(" %14lf MB/Sec", x / K / K); \
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else \
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printf(" %14lf GB/Sec", x / K / K / K); \
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} while (0)
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int bench_mem_memcpy(int argc, const char **argv,
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const char *prefix __maybe_unused)
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{
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int i;
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size_t len;
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double result_bps[2];
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u64 result_cycle[2];
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argc = parse_options(argc, argv, options,
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bench_mem_memcpy_usage, 0);
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if (use_cycle)
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init_cycle();
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len = (size_t)perf_atoll((char *)length_str);
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result_cycle[0] = result_cycle[1] = 0ULL;
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result_bps[0] = result_bps[1] = 0.0;
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if ((s64)len <= 0) {
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fprintf(stderr, "Invalid length:%s\n", length_str);
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return 1;
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}
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/* same to without specifying either of prefault and no-prefault */
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if (only_prefault && no_prefault)
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only_prefault = no_prefault = false;
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for (i = 0; routines[i].name; i++) {
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if (!strcmp(routines[i].name, routine))
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break;
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}
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if (!routines[i].name) {
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printf("Unknown routine:%s\n", routine);
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printf("Available routines...\n");
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for (i = 0; routines[i].name; i++) {
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printf("\t%s ... %s\n",
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routines[i].name, routines[i].desc);
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}
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return 1;
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}
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if (bench_format == BENCH_FORMAT_DEFAULT)
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printf("# Copying %s Bytes ...\n\n", length_str);
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if (!only_prefault && !no_prefault) {
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/* show both of results */
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if (use_cycle) {
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result_cycle[0] =
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do_memcpy_cycle(routines[i].fn, len, false);
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result_cycle[1] =
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do_memcpy_cycle(routines[i].fn, len, true);
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} else {
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result_bps[0] =
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do_memcpy_gettimeofday(routines[i].fn,
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len, false);
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result_bps[1] =
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do_memcpy_gettimeofday(routines[i].fn,
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len, true);
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}
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} else {
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if (use_cycle) {
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result_cycle[pf] =
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do_memcpy_cycle(routines[i].fn,
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len, only_prefault);
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} else {
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result_bps[pf] =
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do_memcpy_gettimeofday(routines[i].fn,
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len, only_prefault);
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}
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}
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switch (bench_format) {
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case BENCH_FORMAT_DEFAULT:
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if (!only_prefault && !no_prefault) {
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if (use_cycle) {
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printf(" %14lf Cycle/Byte\n",
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(double)result_cycle[0]
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/ (double)len);
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printf(" %14lf Cycle/Byte (with prefault)\n",
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(double)result_cycle[1]
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/ (double)len);
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} else {
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print_bps(result_bps[0]);
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printf("\n");
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print_bps(result_bps[1]);
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printf(" (with prefault)\n");
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}
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} else {
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if (use_cycle) {
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printf(" %14lf Cycle/Byte",
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(double)result_cycle[pf]
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/ (double)len);
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} else
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print_bps(result_bps[pf]);
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printf("%s\n", only_prefault ? " (with prefault)" : "");
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}
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break;
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case BENCH_FORMAT_SIMPLE:
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if (!only_prefault && !no_prefault) {
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if (use_cycle) {
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printf("%lf %lf\n",
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(double)result_cycle[0] / (double)len,
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(double)result_cycle[1] / (double)len);
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} else {
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printf("%lf %lf\n",
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result_bps[0], result_bps[1]);
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}
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} else {
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if (use_cycle) {
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printf("%lf\n", (double)result_cycle[pf]
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/ (double)len);
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} else
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printf("%lf\n", result_bps[pf]);
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}
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break;
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default:
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/* reaching this means there's some disaster: */
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die("unknown format: %d\n", bench_format);
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break;
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}
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return 0;
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}
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