1 /*
2 * mem-memcpy.c
3 *
4 * memcpy: Simple memory copy in various ways
5 *
6 * Written by Hitoshi Mitake <mitake@dcl.info.waseda.ac.jp>
7 */
8
9 #include "../perf.h"
10 #include "../util/util.h"
11 #include "../util/parse-options.h"
12 #include "../util/header.h"
13 #include "bench.h"
14 #include "mem-memcpy-arch.h"
15
16 #include <stdio.h>
17 #include <stdlib.h>
18 #include <string.h>
19 #include <sys/time.h>
20 #include <errno.h>
21
22 #define K 1024
23
24 static const char *length_str = "1MB";
25 static const char *routine = "default";
26 static int iterations = 1;
27 static bool use_cycle;
28 static int cycle_fd;
29 static bool only_prefault;
30 static bool no_prefault;
31
32 static const struct option options[] = {
33 OPT_STRING('l', "length", &length_str, "1MB",
34 "Specify length of memory to copy. "
35 "Available units: B, KB, MB, GB and TB (upper and lower)"),
36 OPT_STRING('r', "routine", &routine, "default",
37 "Specify routine to copy"),
38 OPT_INTEGER('i', "iterations", &iterations,
39 "repeat memcpy() invocation this number of times"),
40 OPT_BOOLEAN('c', "cycle", &use_cycle,
41 "Use cycles event instead of gettimeofday() for measuring"),
42 OPT_BOOLEAN('o', "only-prefault", &only_prefault,
43 "Show only the result with page faults before memcpy()"),
44 OPT_BOOLEAN('n', "no-prefault", &no_prefault,
45 "Show only the result without page faults before memcpy()"),
46 OPT_END()
47 };
48
49 typedef void *(*memcpy_t)(void *, const void *, size_t);
50
51 struct routine {
52 const char *name;
53 const char *desc;
54 memcpy_t fn;
55 };
56
57 struct routine routines[] = {
58 { "default",
59 "Default memcpy() provided by glibc",
60 memcpy },
61 #ifdef ARCH_X86_64
62
63 #define MEMCPY_FN(fn, name, desc) { name, desc, fn },
64 #include "mem-memcpy-x86-64-asm-def.h"
65 #undef MEMCPY_FN
66
67 #endif
68
69 { NULL,
70 NULL,
71 NULL }
72 };
73
74 static const char * const bench_mem_memcpy_usage[] = {
75 "perf bench mem memcpy <options>",
76 NULL
77 };
78
79 static struct perf_event_attr cycle_attr = {
80 .type = PERF_TYPE_HARDWARE,
81 .config = PERF_COUNT_HW_CPU_CYCLES
82 };
83
init_cycle(void)84 static void init_cycle(void)
85 {
86 cycle_fd = sys_perf_event_open(&cycle_attr, getpid(), -1, -1, 0);
87
88 if (cycle_fd < 0 && errno == ENOSYS)
89 die("No CONFIG_PERF_EVENTS=y kernel support configured?\n");
90 else
91 BUG_ON(cycle_fd < 0);
92 }
93
get_cycle(void)94 static u64 get_cycle(void)
95 {
96 int ret;
97 u64 clk;
98
99 ret = read(cycle_fd, &clk, sizeof(u64));
100 BUG_ON(ret != sizeof(u64));
101
102 return clk;
103 }
104
timeval2double(struct timeval * ts)105 static double timeval2double(struct timeval *ts)
106 {
107 return (double)ts->tv_sec +
108 (double)ts->tv_usec / (double)1000000;
109 }
110
alloc_mem(void ** dst,void ** src,size_t length)111 static void alloc_mem(void **dst, void **src, size_t length)
112 {
113 *dst = zalloc(length);
114 if (!*dst)
115 die("memory allocation failed - maybe length is too large?\n");
116
117 *src = zalloc(length);
118 if (!*src)
119 die("memory allocation failed - maybe length is too large?\n");
120 /* Make sure to always replace the zero pages even if MMAP_THRESH is crossed */
121 memset(*src, 0, length);
122 }
123
do_memcpy_cycle(memcpy_t fn,size_t len,bool prefault)124 static u64 do_memcpy_cycle(memcpy_t fn, size_t len, bool prefault)
125 {
126 u64 cycle_start = 0ULL, cycle_end = 0ULL;
127 void *src = NULL, *dst = NULL;
128 int i;
129
130 alloc_mem(&src, &dst, len);
131
132 if (prefault)
133 fn(dst, src, len);
134
135 cycle_start = get_cycle();
136 for (i = 0; i < iterations; ++i)
137 fn(dst, src, len);
138 cycle_end = get_cycle();
139
140 free(src);
141 free(dst);
142 return cycle_end - cycle_start;
143 }
144
do_memcpy_gettimeofday(memcpy_t fn,size_t len,bool prefault)145 static double do_memcpy_gettimeofday(memcpy_t fn, size_t len, bool prefault)
146 {
147 struct timeval tv_start, tv_end, tv_diff;
148 void *src = NULL, *dst = NULL;
149 int i;
150
151 alloc_mem(&src, &dst, len);
152
153 if (prefault)
154 fn(dst, src, len);
155
156 BUG_ON(gettimeofday(&tv_start, NULL));
157 for (i = 0; i < iterations; ++i)
158 fn(dst, src, len);
159 BUG_ON(gettimeofday(&tv_end, NULL));
160
161 timersub(&tv_end, &tv_start, &tv_diff);
162
163 free(src);
164 free(dst);
165 return (double)((double)len / timeval2double(&tv_diff));
166 }
167
168 #define pf (no_prefault ? 0 : 1)
169
170 #define print_bps(x) do { \
171 if (x < K) \
172 printf(" %14lf B/Sec", x); \
173 else if (x < K * K) \
174 printf(" %14lfd KB/Sec", x / K); \
175 else if (x < K * K * K) \
176 printf(" %14lf MB/Sec", x / K / K); \
177 else \
178 printf(" %14lf GB/Sec", x / K / K / K); \
179 } while (0)
180
bench_mem_memcpy(int argc,const char ** argv,const char * prefix __maybe_unused)181 int bench_mem_memcpy(int argc, const char **argv,
182 const char *prefix __maybe_unused)
183 {
184 int i;
185 size_t len;
186 double result_bps[2];
187 u64 result_cycle[2];
188
189 argc = parse_options(argc, argv, options,
190 bench_mem_memcpy_usage, 0);
191
192 if (use_cycle)
193 init_cycle();
194
195 len = (size_t)perf_atoll((char *)length_str);
196
197 result_cycle[0] = result_cycle[1] = 0ULL;
198 result_bps[0] = result_bps[1] = 0.0;
199
200 if ((s64)len <= 0) {
201 fprintf(stderr, "Invalid length:%s\n", length_str);
202 return 1;
203 }
204
205 /* same to without specifying either of prefault and no-prefault */
206 if (only_prefault && no_prefault)
207 only_prefault = no_prefault = false;
208
209 for (i = 0; routines[i].name; i++) {
210 if (!strcmp(routines[i].name, routine))
211 break;
212 }
213 if (!routines[i].name) {
214 printf("Unknown routine:%s\n", routine);
215 printf("Available routines...\n");
216 for (i = 0; routines[i].name; i++) {
217 printf("\t%s ... %s\n",
218 routines[i].name, routines[i].desc);
219 }
220 return 1;
221 }
222
223 if (bench_format == BENCH_FORMAT_DEFAULT)
224 printf("# Copying %s Bytes ...\n\n", length_str);
225
226 if (!only_prefault && !no_prefault) {
227 /* show both of results */
228 if (use_cycle) {
229 result_cycle[0] =
230 do_memcpy_cycle(routines[i].fn, len, false);
231 result_cycle[1] =
232 do_memcpy_cycle(routines[i].fn, len, true);
233 } else {
234 result_bps[0] =
235 do_memcpy_gettimeofday(routines[i].fn,
236 len, false);
237 result_bps[1] =
238 do_memcpy_gettimeofday(routines[i].fn,
239 len, true);
240 }
241 } else {
242 if (use_cycle) {
243 result_cycle[pf] =
244 do_memcpy_cycle(routines[i].fn,
245 len, only_prefault);
246 } else {
247 result_bps[pf] =
248 do_memcpy_gettimeofday(routines[i].fn,
249 len, only_prefault);
250 }
251 }
252
253 switch (bench_format) {
254 case BENCH_FORMAT_DEFAULT:
255 if (!only_prefault && !no_prefault) {
256 if (use_cycle) {
257 printf(" %14lf Cycle/Byte\n",
258 (double)result_cycle[0]
259 / (double)len);
260 printf(" %14lf Cycle/Byte (with prefault)\n",
261 (double)result_cycle[1]
262 / (double)len);
263 } else {
264 print_bps(result_bps[0]);
265 printf("\n");
266 print_bps(result_bps[1]);
267 printf(" (with prefault)\n");
268 }
269 } else {
270 if (use_cycle) {
271 printf(" %14lf Cycle/Byte",
272 (double)result_cycle[pf]
273 / (double)len);
274 } else
275 print_bps(result_bps[pf]);
276
277 printf("%s\n", only_prefault ? " (with prefault)" : "");
278 }
279 break;
280 case BENCH_FORMAT_SIMPLE:
281 if (!only_prefault && !no_prefault) {
282 if (use_cycle) {
283 printf("%lf %lf\n",
284 (double)result_cycle[0] / (double)len,
285 (double)result_cycle[1] / (double)len);
286 } else {
287 printf("%lf %lf\n",
288 result_bps[0], result_bps[1]);
289 }
290 } else {
291 if (use_cycle) {
292 printf("%lf\n", (double)result_cycle[pf]
293 / (double)len);
294 } else
295 printf("%lf\n", result_bps[pf]);
296 }
297 break;
298 default:
299 /* reaching this means there's some disaster: */
300 die("unknown format: %d\n", bench_format);
301 break;
302 }
303
304 return 0;
305 }
306