benchtests/bench-memcpy-random.c

   1 /* Measure memcpy performance.
   2    Copyright (C) 2016-2021 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_PAGE_SIZE (512*1024+4096)
  20 #define TEST_MAIN
  21 #define TEST_NAME "memcpy"
  22 #include "bench-string.h"
  23 #include <assert.h>
  24 #include "json-lib.h"
  25
  26 #define MAX_COPIES 8192
  27
  28 IMPL (memcpy, 1)
  29
  30 typedef struct { uint16_t size; uint16_t freq; } freq_data_t;
  31 typedef struct { uint8_t align; uint16_t freq; } align_data_t;
  32
  33 #define SIZE_NUM 65536
  34 #define SIZE_MASK (SIZE_NUM-1)
  35 static uint8_t size_arr[SIZE_NUM];
  36
  37 /* Frequency data for memcpy of less than 4096 bytes based on SPEC2017.  */
  38 static freq_data_t size_freq[] =
  39 {
  40 { 32, 22320}, { 16, 9554}, {  8, 8915}, {152, 5327}, {  4, 2159}, {292, 2035},
  41 { 12, 1608}, { 24, 1343}, {1152, 895}, {144, 813}, {884, 733}, {284, 721},
  42 {120, 661}, {  2, 649}, {882, 550}, {  5, 475}, {  7, 461}, {108, 460},
  43 { 10, 361}, {  9, 361}, {  6, 334}, {  3, 326}, {464, 308}, {2048, 303},
  44 {  1, 298}, { 64, 250}, { 11, 197}, {296, 194}, { 68, 187}, { 15, 185},
  45 {192, 184}, {1764, 183}, { 13, 173}, {560, 126}, {160, 115}, {288,  96},
  46 {104,  96}, {1144,  83}, { 18,  80}, { 23,  78}, { 40,  77}, { 19,  68},
  47 { 48,  63}, { 17,  57}, { 72,  54}, {1280,  51}, { 20,  49}, { 28,  47},
  48 { 22,  46}, {640,  45}, { 25,  41}, { 14,  40}, { 56,  37}, { 27,  35},
  49 { 35,  33}, {384,  33}, { 29,  32}, { 80,  30}, {4095,  22}, {232,  22},
  50 { 36,  19}, {184,  17}, { 21,  17}, {256,  16}, { 44,  15}, { 26,  15},
  51 { 31,  14}, { 88,  14}, {176,  13}, { 33,  12}, {1024,  12}, {208,  11},
  52 { 62,  11}, {128,  10}, {704,  10}, {324,  10}, { 96,  10}, { 60,   9},
  53 {136,   9}, {124,   9}, { 34,   8}, { 30,   8}, {480,   8}, {1344,   8},
  54 {273,   7}, {520,   7}, {112,   6}, { 52,   6}, {344,   6}, {336,   6},
  55 {504,   5}, {168,   5}, {424,   5}, {  0,   4}, { 76,   3}, {200,   3},
  56 {512,   3}, {312,   3}, {240,   3}, {960,   3}, {264,   2}, {672,   2},
  57 { 38,   2}, {328,   2}, { 84,   2}, { 39,   2}, {216,   2}, { 42,   2},
  58 { 37,   2}, {1608,   2}, { 70,   2}, { 46,   2}, {536,   2}, {280,   1},
  59 {248,   1}, { 47,   1}, {1088,   1}, {1288,   1}, {224,   1}, { 41,   1},
  60 { 50,   1}, { 49,   1}, {808,   1}, {360,   1}, {440,   1}, { 43,   1},
  61 { 45,   1}, { 78,   1}, {968,   1}, {392,   1}, { 54,   1}, { 53,   1},
  62 { 59,   1}, {376,   1}, {664,   1}, { 58,   1}, {272,   1}, { 66,   1},
  63 {2688,   1}, {472,   1}, {568,   1}, {720,   1}, { 51,   1}, { 63,   1},
  64 { 86,   1}, {496,   1}, {776,   1}, { 57,   1}, {680,   1}, {792,   1},
  65 {122,   1}, {760,   1}, {824,   1}, {552,   1}, { 67,   1}, {456,   1},
  66 {984,   1}, { 74,   1}, {408,   1}, { 75,   1}, { 92,   1}, {576,   1},
  67 {116,   1}, { 65,   1}, {117,   1}, { 82,   1}, {352,   1}, { 55,   1},
  68 {100,   1}, { 90,   1}, {696,   1}, {111,   1}, {880,   1}, { 79,   1},
  69 {488,   1}, { 61,   1}, {114,   1}, { 94,   1}, {1032,   1}, { 98,   1},
  70 { 87,   1}, {584,   1}, { 85,   1}, {648,   1}, {0, 0}
  71 };
  72
  73 #define ALIGN_NUM 1024
  74 #define ALIGN_MASK (ALIGN_NUM-1)
  75 static uint8_t src_align_arr[ALIGN_NUM];
  76 static uint8_t dst_align_arr[ALIGN_NUM];
  77
  78 /* Source alignment frequency for memcpy based on SPEC2017.  */
  79 static align_data_t src_align_freq[] =
  80 {
  81   {8, 300}, {16, 292}, {32, 168}, {64, 153}, {4, 79}, {2, 14}, {1, 18}, {0, 0}
  82 };
  83
  84 /* Destination alignment frequency for memcpy based on SPEC2017.  */
  85 static align_data_t dst_align_freq[] =
  86 {
  87   {8, 265}, {16, 263}, {64, 209}, {32, 174}, {4, 90}, {2, 10}, {1, 13}, {0, 0}
  88 };
  89
  90 typedef struct
  91 {
  92   uint64_t src : 24;
  93   uint64_t dst : 24;
  94   uint64_t len : 16;
  95 } copy_t;
  96
  97 static copy_t copy[MAX_COPIES];
  98
  99 typedef char *(*proto_t) (char *, const char *, size_t);
 100
 101 static void
 102 init_copy_distribution (void)
 103 {
 104   int i, j, freq, size, n;
 105
 106   for (n = i = 0; (freq = size_freq[i].freq) != 0; i++)
 107     for (j = 0, size = size_freq[i].size; j < freq; j++)
 108       size_arr[n++] = size;
 109   assert (n == SIZE_NUM);
 110
 111   for (n = i = 0; (freq = src_align_freq[i].freq) != 0; i++)
 112     for (j = 0, size = src_align_freq[i].align; j < freq; j++)
 113       src_align_arr[n++] = size - 1;
 114   assert (n == ALIGN_NUM);
 115
 116   for (n = i = 0; (freq = dst_align_freq[i].freq) != 0; i++)
 117     for (j = 0, size = dst_align_freq[i].align; j < freq; j++)
 118       dst_align_arr[n++] = size - 1;
 119   assert (n == ALIGN_NUM);
 120 }
 121
 122
 123 static void
 124 do_one_test (json_ctx_t *json_ctx, impl_t *impl, char *dst, char *src,
 125              copy_t *copy, size_t n)
 126 {
 127   timing_t start, stop, cur;
 128   size_t iters = INNER_LOOP_ITERS_MEDIUM;
 129
 130   for (int j = 0; j < n; j++)
 131     CALL (impl, dst + copy[j].dst, src + copy[j].src, copy[j].len);
 132
 133   TIMING_NOW (start);
 134   for (int i = 0; i < iters; ++i)
 135     for (int j = 0; j < n; j++)
 136       CALL (impl, dst + copy[j].dst, src + copy[j].src, copy[j].len);
 137   TIMING_NOW (stop);
 138
 139   TIMING_DIFF (cur, start, stop);
 140
 141   json_element_double (json_ctx, (double) cur / (double) iters);
 142 }
 143
 144 static void
 145 do_test (json_ctx_t *json_ctx, size_t max_size)
 146 {
 147   int i;
 148
 149   memset (buf1, 1, max_size);
 150
 151   /* Create a random set of copies with the given size and alignment
 152      distributions.  */
 153   for (i = 0; i < MAX_COPIES; i++)
 154     {
 155       copy[i].dst = (rand () & (max_size - 1));
 156       copy[i].dst &= ~dst_align_arr[rand () & ALIGN_MASK];
 157       copy[i].src = (rand () & (max_size - 1));
 158       copy[i].src &= ~src_align_arr[rand () & ALIGN_MASK];
 159       copy[i].len = size_arr[rand () & SIZE_MASK];
 160     }
 161
 162   json_element_object_begin (json_ctx);
 163   json_attr_uint (json_ctx, "max-size", (double) max_size);
 164   json_array_begin (json_ctx, "timings");
 165
 166   FOR_EACH_IMPL (impl, 0)
 167     do_one_test (json_ctx, impl, (char *) buf2, (char *) buf1, copy, i);
 168
 169   json_array_end (json_ctx);
 170   json_element_object_end (json_ctx);
 171 }
 172
 173 int
 174 test_main (void)
 175 {
 176   json_ctx_t json_ctx;
 177
 178   test_init ();
 179   init_copy_distribution ();
 180
 181   json_init (&json_ctx, 0, stdout);
 182
 183   json_document_begin (&json_ctx);
 184   json_attr_string (&json_ctx, "timing_type", TIMING_TYPE);
 185
 186   json_attr_object_begin (&json_ctx, "functions");
 187   json_attr_object_begin (&json_ctx, TEST_NAME);
 188   json_attr_string (&json_ctx, "bench-variant", "random");
 189
 190   json_array_begin (&json_ctx, "ifuncs");
 191   FOR_EACH_IMPL (impl, 0)
 192     json_element_string (&json_ctx, impl->name);
 193   json_array_end (&json_ctx);
 194
 195   json_array_begin (&json_ctx, "results");
 196   for (int i = 4; i <= 512; i = i * 2)
 197     do_test (&json_ctx, i * 1024);
 198
 199   json_array_end (&json_ctx);
 200   json_attr_object_end (&json_ctx);
 201   json_attr_object_end (&json_ctx);
 202   json_document_end (&json_ctx);
 203
 204   return ret;
 205 }
 206
 207 #include <support/test-driver.c>