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