tools/perf/bench/mem-memset.c

   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
  24 static const char       *length_str     = "1MB";
  25 static const char       *routine        = "default";
  26 static int              iterations      = 1;
  27 static bool             use_clock;
  28 static int              clock_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 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
  49 typedef void *(*memset_t)(void *, int, size_t);
  50
  51 struct routine {
  52         const char *name;
  53         const char *desc;
  54         memset_t fn;
  55 };
  56
  57 static 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
  74 static const char * const bench_mem_memset_usage[] = {
  75         "perf bench mem memset <options>",
  76         NULL
  77 };
  78
  79 static struct perf_event_attr clock_attr = {
  80         .type           = PERF_TYPE_HARDWARE,
  81         .config         = PERF_COUNT_HW_CPU_CYCLES
  82 };
  83
  84 static 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
  94 static 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
 105 static double timeval2double(struct timeval *ts)
 106 {
 107         return (double)ts->tv_sec +
 108                 (double)ts->tv_usec / (double)1000000;
 109 }
 110
 111 static 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
 118 static 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
 138 static 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
 173 int 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 }