aboutsummaryrefslogtreecommitdiffstats
path: root/tools/perf/bench/mem-memcpy.c
blob: 6ad2b1c6b27b1d5b1961963df14676939403e14b (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
/*
 * 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 "mem-memcpy-arch.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		iterations	= 1;
static bool		use_clock;
static int		clock_fd;
static bool		only_prefault;
static bool		no_prefault;

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_INTEGER('i', "iterations", &iterations,
		    "repeat memcpy() invocation this number of times"),
	OPT_BOOLEAN('c', "clock", &use_clock,
		    "Use CPU clock for measuring"),
	OPT_BOOLEAN('o', "only-prefault", &only_prefault,
		    "Show only the result with page faults before memcpy()"),
	OPT_BOOLEAN('n', "no-prefault", &no_prefault,
		    "Show only the result without page faults before memcpy()"),
	OPT_END()
};

typedef void *(*memcpy_t)(void *, const void *, size_t);

struct routine {
	const char *name;
	const char *desc;
	memcpy_t fn;
};

struct routine routines[] = {
	{ "default",
	  "Default memcpy() provided by glibc",
	  memcpy },
#ifdef ARCH_X86_64

#define MEMCPY_FN(fn, name, desc) { name, desc, fn },
#include "mem-memcpy-x86-64-asm-def.h"
#undef MEMCPY_FN

#endif

	{ 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;
}

static void alloc_mem(void **dst, void **src, size_t length)
{
	*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");
}

static u64 do_memcpy_clock(memcpy_t fn, size_t len, bool prefault)
{
	u64 clock_start = 0ULL, clock_end = 0ULL;
	void *src = NULL, *dst = NULL;
	int i;

	alloc_mem(&src, &dst, len);

	if (prefault)
		fn(dst, src, len);

	clock_start = get_clock();
	for (i = 0; i < iterations; ++i)
		fn(dst, src, len);
	clock_end = get_clock();

	free(src);
	free(dst);
	return clock_end - clock_start;
}

static double do_memcpy_gettimeofday(memcpy_t fn, size_t len, bool prefault)
{
	struct timeval tv_start, tv_end, tv_diff;
	void *src = NULL, *dst = NULL;
	int i;

	alloc_mem(&src, &dst, len);

	if (prefault)
		fn(dst, src, len);

	BUG_ON(gettimeofday(&tv_start, NULL));
	for (i = 0; i < iterations; ++i)
		fn(dst, src, len);
	BUG_ON(gettimeofday(&tv_end, NULL));

	timersub(&tv_end, &tv_start, &tv_diff);

	free(src);
	free(dst);
	return (double)((double)len / timeval2double(&tv_diff));
}

#define pf (no_prefault ? 0 : 1)

#define print_bps(x) do {					\
		if (x < K)					\
			printf(" %14lf B/Sec", x);		\
		else if (x < K * K)				\
			printf(" %14lfd KB/Sec", x / K);	\
		else if (x < K * K * K)				\
			printf(" %14lf MB/Sec", x / K / K);	\
		else						\
			printf(" %14lf GB/Sec", x / K / K / K); \
	} while (0)

int bench_mem_memcpy(int argc, const char **argv,
		     const char *prefix __used)
{
	int i;
	size_t len;
	double result_bps[2];
	u64 result_clock[2];

	argc = parse_options(argc, argv, options,
			     bench_mem_memcpy_usage, 0);

	if (use_clock)
		init_clock();

	len = (size_t)perf_atoll((char *)length_str);

	result_clock[0] = result_clock[1] = 0ULL;
	result_bps[0] = result_bps[1] = 0.0;

	if ((s64)len <= 0) {
		fprintf(stderr, "Invalid length:%s\n", length_str);
		return 1;
	}

	/* same to without specifying either of prefault and no-prefault */
	if (only_prefault && no_prefault)
		only_prefault = no_prefault = false;

	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;
	}

	if (bench_format == BENCH_FORMAT_DEFAULT)
		printf("# Copying %s Bytes ...\n\n", length_str);

	if (!only_prefault && !no_prefault) {
		/* show both of results */
		if (use_clock) {
			result_clock[0] =
				do_memcpy_clock(routines[i].fn, len, false);
			result_clock[1] =
				do_memcpy_clock(routines[i].fn, len, true);
		} else {
			result_bps[0] =
				do_memcpy_gettimeofday(routines[i].fn,
						len, false);
			result_bps[1] =
				do_memcpy_gettimeofday(routines[i].fn,
						len, true);
		}
	} else {
		if (use_clock) {
			result_clock[pf] =
				do_memcpy_clock(routines[i].fn,
						len, only_prefault);
		} else {
			result_bps[pf] =
				do_memcpy_gettimeofday(routines[i].fn,
						len, only_prefault);
		}
	}

	switch (bench_format) {
	case BENCH_FORMAT_DEFAULT:
		if (!only_prefault && !no_prefault) {
			if (use_clock) {
				printf(" %14lf Clock/Byte\n",
					(double)result_clock[0]
					/ (double)len);
				printf(" %14lf Clock/Byte (with prefault)\n",
					(double)result_clock[1]
					/ (double)len);
			} else {
				print_bps(result_bps[0]);
				printf("\n");
				print_bps(result_bps[1]);
				printf(" (with prefault)\n");
			}
		} else {
			if (use_clock) {
				printf(" %14lf Clock/Byte",
					(double)result_clock[pf]
					/ (double)len);
			} else
				print_bps(result_bps[pf]);

			printf("%s\n", only_prefault ? " (with prefault)" : "");
		}
		break;
	case BENCH_FORMAT_SIMPLE:
		if (!only_prefault && !no_prefault) {
			if (use_clock) {
				printf("%lf %lf\n",
					(double)result_clock[0] / (double)len,
					(double)result_clock[1] / (double)len);
			} else {
				printf("%lf %lf\n",
					result_bps[0], result_bps[1]);
			}
		} else {
			if (use_clock) {
				printf("%lf\n", (double)result_clock[pf]
					/ (double)len);
			} else
				printf("%lf\n", result_bps[pf]);
		}
		break;
	default:
		/* reaching this means there's some disaster: */
		die("unknown format: %d\n", bench_format);
		break;
	}

	return 0;
}