benchtests/bench-memcpy-random.c

   1 /* Measure memcpy performance.
   2    Copyright (C) 2016-2023 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #define MIN_SIZE 32768
  20 #define MAX_SIZE (1024*1024)
  21 #define NUM_TESTS 16384
  22
  23 #define MIN_PAGE_SIZE (MAX_SIZE + getpagesize())
  24 #define TEST_MAIN
  25 #define TEST_NAME "memcpy"
  26 #include "bench-string.h"
  27 #include <assert.h>
  28 #include "json-lib.h"
  29
  30 IMPL (memcpy, 1)
  31
  32 typedef struct { uint16_t size; uint16_t freq; } freq_data_t;
  33 typedef struct { uint8_t align; uint16_t freq; } align_data_t;
  34
  35 #define SIZE_NUM 65536
  36 #define SIZE_MASK (SIZE_NUM-1)
  37 static uint8_t size_arr[SIZE_NUM];
  38
  39 /* Frequency data for memcpy of less than 4096 bytes based on SPEC2017.  */
  40 static freq_data_t size_freq[] =
  41 {
  42 {32,22320}, { 16,9554}, {  8,8915}, {152,5327}, {  4,2159}, {292,2035},
  43 { 12,1608}, { 24,1343}, {1152,895}, {144, 813}, {884, 733}, {284, 721},
  44 {120, 661}, {  2, 649}, {882, 550}, {  5, 475}, {  7, 461}, {108, 460},
  45 { 10, 361}, {  9, 361}, {  6, 334}, {  3, 326}, {464, 308}, {2048,303},
  46 {  1, 298}, { 64, 250}, { 11, 197}, {296, 194}, { 68, 187}, { 15, 185},
  47 {192, 184}, {1764,183}, { 13, 173}, {560, 126}, {160, 115}, {288,  96},
  48 {104,  96}, {1144, 83}, { 18,  80}, { 23,  78}, { 40,  77}, { 19,  68},
  49 { 48,  63}, { 17,  57}, { 72,  54}, {1280, 51}, { 20,  49}, { 28,  47},
  50 { 22,  46}, {640,  45}, { 25,  41}, { 14,  40}, { 56,  37}, { 27,  35},
  51 { 35,  33}, {384,  33}, { 29,  32}, { 80,  30}, {4095, 22}, {232,  22},
  52 { 36,  19}, {184,  17}, { 21,  17}, {256,  16}, { 44,  15}, { 26,  15},
  53 { 31,  14}, { 88,  14}, {176,  13}, { 33,  12}, {1024, 12}, {208,  11},
  54 { 62,  11}, {128,  10}, {704,  10}, {324,  10}, { 96,  10}, { 60,   9},
  55 {136,   9}, {124,   9}, { 34,   8}, { 30,   8}, {480,   8}, {1344,  8},
  56 {273,   7}, {520,   7}, {112,   6}, { 52,   6}, {344,   6}, {336,   6},
  57 {504,   5}, {168,   5}, {424,   5}, {  0,   4}, { 76,   3}, {200,   3},
  58 {512,   3}, {312,   3}, {240,   3}, {960,   3}, {264,   2}, {672,   2},
  59 { 38,   2}, {328,   2}, { 84,   2}, { 39,   2}, {216,   2}, { 42,   2},
  60 { 37,   2}, {1608,  2}, { 70,   2}, { 46,   2}, {536,   2}, {280,   1},
  61 {248,   1}, { 47,   1}, {1088,  1}, {1288,  1}, {224,   1}, { 41,   1},
  62 { 50,   1}, { 49,   1}, {808,   1}, {360,   1}, {440,   1}, { 43,   1},
  63 { 45,   1}, { 78,   1}, {968,   1}, {392,   1}, { 54,   1}, { 53,   1},
  64 { 59,   1}, {376,   1}, {664,   1}, { 58,   1}, {272,   1}, { 66,   1},
  65 {2688,  1}, {472,   1}, {568,   1}, {720,   1}, { 51,   1}, { 63,   1},
  66 { 86,   1}, {496,   1}, {776,   1}, { 57,   1}, {680,   1}, {792,   1},
  67 {122,   1}, {760,   1}, {824,   1}, {552,   1}, { 67,   1}, {456,   1},
  68 {984,   1}, { 74,   1}, {408,   1}, { 75,   1}, { 92,   1}, {576,   1},
  69 {116,   1}, { 65,   1}, {117,   1}, { 82,   1}, {352,   1}, { 55,   1},
  70 {100,   1}, { 90,   1}, {696,   1}, {111,   1}, {880,   1}, { 79,   1},
  71 {488,   1}, { 61,   1}, {114,   1}, { 94,   1}, {1032,  1}, { 98,   1},
  72 { 87,   1}, {584,   1}, { 85,   1}, {648,   1}, {0, 0}
  73 };
  74
  75 #define ALIGN_NUM 1024
  76 #define ALIGN_MASK (ALIGN_NUM-1)
  77 static uint8_t src_align_arr[ALIGN_NUM];
  78 static uint8_t dst_align_arr[ALIGN_NUM];
  79
  80 /* Source alignment frequency for memcpy based on SPEC2017.  */
  81 static align_data_t src_align_freq[] =
  82 {
  83   {8, 300}, {16, 292}, {32, 168}, {64, 153}, {4, 79}, {2, 14}, {1, 18}, {0, 0}
  84 };
  85
  86 /* Destination alignment frequency for memcpy based on SPEC2017.  */
  87 static align_data_t dst_align_freq[] =
  88 {
  89   {8, 265}, {16, 263}, {64, 209}, {32, 174}, {4, 90}, {2, 10}, {1, 13}, {0, 0}
  90 };
  91
  92 typedef struct
  93 {
  94   uint64_t src : 24;
  95   uint64_t dst : 24;
  96   uint64_t len : 16;
  97 } copy_t;
  98
  99 static copy_t test_arr[NUM_TESTS];
 100
 101 typedef char *(*proto_t) (char *, const char *, size_t);
 102
 103 static void
 104 init_copy_distribution (void)
 105 {
 106   int i, j, freq, size, n;
 107
 108   for (n = i = 0; (freq = size_freq[i].freq) != 0; i++)
 109     for (j = 0, size = size_freq[i].size; j < freq; j++)
 110       size_arr[n++] = size;
 111   assert (n == SIZE_NUM);
 112
 113   for (n = i = 0; (freq = src_align_freq[i].freq) != 0; i++)
 114     for (j = 0, size = src_align_freq[i].align; j < freq; j++)
 115       src_align_arr[n++] = size - 1;
 116   assert (n == ALIGN_NUM);
 117
 118   for (n = i = 0; (freq = dst_align_freq[i].freq) != 0; i++)
 119     for (j = 0, size = dst_align_freq[i].align; j < freq; j++)
 120       dst_align_arr[n++] = size - 1;
 121   assert (n == ALIGN_NUM);
 122 }
 123
 124
 125 static void
 126 do_one_test (json_ctx_t *json_ctx, impl_t *impl, char *dst, char *src,
 127              copy_t *copy, size_t n)
 128 {
 129   timing_t start, stop, cur;
 130   size_t iters = INNER_LOOP_ITERS_MEDIUM / 2;
 131
 132   for (int j = 0; j < n; j++)
 133     CALL (impl, dst + copy[j].dst, src + copy[j].src, copy[j].len);
 134
 135   TIMING_NOW (start);
 136   for (int i = 0; i < iters; ++i)
 137     for (int j = 0; j < n; j++)
 138       CALL (impl, dst + copy[j].dst, src + copy[j].src, copy[j].len);
 139   TIMING_NOW (stop);
 140
 141   TIMING_DIFF (cur, start, stop);
 142
 143   json_element_double (json_ctx, (double) cur / (double) iters);
 144 }
 145
 146 static void
 147 do_test (json_ctx_t *json_ctx, size_t max_size)
 148 {
 149   int i;
 150
 151   memset (buf1, 1, max_size);
 152
 153   /* Create a random set of copies with the given size and alignment
 154      distributions.  */
 155   for (i = 0; i < NUM_TESTS; i++)
 156     {
 157       test_arr[i].dst = (rand () & (max_size - 1));
 158       test_arr[i].dst &= ~dst_align_arr[rand () & ALIGN_MASK];
 159       test_arr[i].src = (rand () & (max_size - 1));
 160       test_arr[i].src &= ~src_align_arr[rand () & ALIGN_MASK];
 161       test_arr[i].len = size_arr[rand () & SIZE_MASK];
 162     }
 163
 164   json_element_object_begin (json_ctx);
 165   json_attr_uint (json_ctx, "length", (double) max_size);
 166   json_array_begin (json_ctx, "timings");
 167
 168   FOR_EACH_IMPL (impl, 0)
 169     do_one_test (json_ctx, impl, (char *) buf2, (char *) buf1, test_arr, i);
 170
 171   json_array_end (json_ctx);
 172   json_element_object_end (json_ctx);
 173 }
 174
 175 int
 176 test_main (void)
 177 {
 178   json_ctx_t json_ctx;
 179
 180   test_init ();
 181   init_copy_distribution ();
 182
 183   json_init (&json_ctx, 0, stdout);
 184
 185   json_document_begin (&json_ctx);
 186   json_attr_string (&json_ctx, "timing_type", TIMING_TYPE);
 187
 188   json_attr_object_begin (&json_ctx, "functions");
 189   json_attr_object_begin (&json_ctx, TEST_NAME);
 190   json_attr_string (&json_ctx, "bench-variant", "random");
 191
 192   json_array_begin (&json_ctx, "ifuncs");
 193   FOR_EACH_IMPL (impl, 0)
 194     json_element_string (&json_ctx, impl->name);
 195   json_array_end (&json_ctx);
 196
 197   json_array_begin (&json_ctx, "results");
 198   for (int i = MIN_SIZE; i <= MAX_SIZE; i = i * 2)
 199     do_test (&json_ctx, i);
 200
 201   json_array_end (&json_ctx);
 202   json_attr_object_end (&json_ctx);
 203   json_attr_object_end (&json_ctx);
 204   json_document_end (&json_ctx);
 205
 206   return ret;
 207 }
 208
 209 #include <support/test-driver.c>