1 /*
2 * memcpy benchmark.
3 *
4 * Copyright (c) 2020, Arm Limited.
5 * SPDX-License-Identifier: MIT
6 */
7
8 #define _GNU_SOURCE
9 #include <stdint.h>
10 #include <stdio.h>
11 #include <string.h>
12 #include <assert.h>
13 #include "stringlib.h"
14 #include "benchlib.h"
15
16 #define ITERS 5000
17 #define ITERS2 20000000
18 #define ITERS3 500000
19 #define MAX_COPIES 8192
20 #define SIZE (256*1024)
21
22 static uint8_t a[SIZE + 4096] __attribute__((__aligned__(64)));
23 static uint8_t b[SIZE + 4096] __attribute__((__aligned__(64)));
24
25 #define F(x) {#x, x},
26
27 static const struct fun
28 {
29 const char *name;
30 void *(*fun)(void *, const void *, size_t);
31 } funtab[] =
32 {
33 F(memcpy)
34 #if __aarch64__
35 F(__memcpy_aarch64)
36 # if __ARM_NEON
37 F(__memcpy_aarch64_simd)
38 # endif
39 #elif __arm__
40 F(__memcpy_arm)
41 #endif
42 #undef F
43 {0, 0}
44 };
45
46 typedef struct { uint16_t size; uint16_t freq; } freq_data_t;
47 typedef struct { uint8_t align; uint16_t freq; } align_data_t;
48
49 #define SIZE_NUM 65536
50 #define SIZE_MASK (SIZE_NUM-1)
51 static uint8_t size_arr[SIZE_NUM];
52
53 /* Frequency data for memcpy of less than 4096 bytes based on SPEC2017. */
54 static freq_data_t size_freq[] =
55 {
56 {32,22320}, { 16,9554}, { 8,8915}, {152,5327}, { 4,2159}, {292,2035},
57 { 12,1608}, { 24,1343}, {1152,895}, {144, 813}, {884, 733}, {284, 721},
58 {120, 661}, { 2, 649}, {882, 550}, { 5, 475}, { 7, 461}, {108, 460},
59 { 10, 361}, { 9, 361}, { 6, 334}, { 3, 326}, {464, 308}, {2048,303},
60 { 1, 298}, { 64, 250}, { 11, 197}, {296, 194}, { 68, 187}, { 15, 185},
61 {192, 184}, {1764,183}, { 13, 173}, {560, 126}, {160, 115}, {288, 96},
62 {104, 96}, {1144, 83}, { 18, 80}, { 23, 78}, { 40, 77}, { 19, 68},
63 { 48, 63}, { 17, 57}, { 72, 54}, {1280, 51}, { 20, 49}, { 28, 47},
64 { 22, 46}, {640, 45}, { 25, 41}, { 14, 40}, { 56, 37}, { 27, 35},
65 { 35, 33}, {384, 33}, { 29, 32}, { 80, 30}, {4095, 22}, {232, 22},
66 { 36, 19}, {184, 17}, { 21, 17}, {256, 16}, { 44, 15}, { 26, 15},
67 { 31, 14}, { 88, 14}, {176, 13}, { 33, 12}, {1024, 12}, {208, 11},
68 { 62, 11}, {128, 10}, {704, 10}, {324, 10}, { 96, 10}, { 60, 9},
69 {136, 9}, {124, 9}, { 34, 8}, { 30, 8}, {480, 8}, {1344, 8},
70 {273, 7}, {520, 7}, {112, 6}, { 52, 6}, {344, 6}, {336, 6},
71 {504, 5}, {168, 5}, {424, 5}, { 0, 4}, { 76, 3}, {200, 3},
72 {512, 3}, {312, 3}, {240, 3}, {960, 3}, {264, 2}, {672, 2},
73 { 38, 2}, {328, 2}, { 84, 2}, { 39, 2}, {216, 2}, { 42, 2},
74 { 37, 2}, {1608, 2}, { 70, 2}, { 46, 2}, {536, 2}, {280, 1},
75 {248, 1}, { 47, 1}, {1088, 1}, {1288, 1}, {224, 1}, { 41, 1},
76 { 50, 1}, { 49, 1}, {808, 1}, {360, 1}, {440, 1}, { 43, 1},
77 { 45, 1}, { 78, 1}, {968, 1}, {392, 1}, { 54, 1}, { 53, 1},
78 { 59, 1}, {376, 1}, {664, 1}, { 58, 1}, {272, 1}, { 66, 1},
79 {2688, 1}, {472, 1}, {568, 1}, {720, 1}, { 51, 1}, { 63, 1},
80 { 86, 1}, {496, 1}, {776, 1}, { 57, 1}, {680, 1}, {792, 1},
81 {122, 1}, {760, 1}, {824, 1}, {552, 1}, { 67, 1}, {456, 1},
82 {984, 1}, { 74, 1}, {408, 1}, { 75, 1}, { 92, 1}, {576, 1},
83 {116, 1}, { 65, 1}, {117, 1}, { 82, 1}, {352, 1}, { 55, 1},
84 {100, 1}, { 90, 1}, {696, 1}, {111, 1}, {880, 1}, { 79, 1},
85 {488, 1}, { 61, 1}, {114, 1}, { 94, 1}, {1032, 1}, { 98, 1},
86 { 87, 1}, {584, 1}, { 85, 1}, {648, 1}, {0, 0}
87 };
88
89 #define ALIGN_NUM 1024
90 #define ALIGN_MASK (ALIGN_NUM-1)
91 static uint8_t src_align_arr[ALIGN_NUM];
92 static uint8_t dst_align_arr[ALIGN_NUM];
93
94 /* Source alignment frequency for memcpy based on SPEC2017. */
95 static align_data_t src_align_freq[] =
96 {
97 {8, 300}, {16, 292}, {32, 168}, {64, 153}, {4, 79}, {2, 14}, {1, 18}, {0, 0}
98 };
99
100 static align_data_t dst_align_freq[] =
101 {
102 {8, 265}, {16, 263}, {64, 209}, {32, 174}, {4, 90}, {2, 10}, {1, 13}, {0, 0}
103 };
104
105 typedef struct
106 {
107 uint64_t src : 24;
108 uint64_t dst : 24;
109 uint64_t len : 16;
110 } copy_t;
111
112 static copy_t copy[MAX_COPIES];
113
114 typedef char *(*proto_t) (char *, const char *, size_t);
115
116 static void
init_copy_distribution(void)117 init_copy_distribution (void)
118 {
119 int i, j, freq, size, n;
120
121 for (n = i = 0; (freq = size_freq[i].freq) != 0; i++)
122 for (j = 0, size = size_freq[i].size; j < freq; j++)
123 size_arr[n++] = size;
124 assert (n == SIZE_NUM);
125
126 for (n = i = 0; (freq = src_align_freq[i].freq) != 0; i++)
127 for (j = 0, size = src_align_freq[i].align; j < freq; j++)
128 src_align_arr[n++] = size - 1;
129 assert (n == ALIGN_NUM);
130
131 for (n = i = 0; (freq = dst_align_freq[i].freq) != 0; i++)
132 for (j = 0, size = dst_align_freq[i].align; j < freq; j++)
133 dst_align_arr[n++] = size - 1;
134 assert (n == ALIGN_NUM);
135 }
136
137 static size_t
init_copies(size_t max_size)138 init_copies (size_t max_size)
139 {
140 size_t total = 0;
141 /* Create a random set of copies with the given size and alignment
142 distributions. */
143 for (int i = 0; i < MAX_COPIES; i++)
144 {
145 copy[i].dst = (rand32 (0) & (max_size - 1));
146 copy[i].dst &= ~dst_align_arr[rand32 (0) & ALIGN_MASK];
147 copy[i].src = (rand32 (0) & (max_size - 1));
148 copy[i].src &= ~src_align_arr[rand32 (0) & ALIGN_MASK];
149 copy[i].len = size_arr[rand32 (0) & SIZE_MASK];
150 total += copy[i].len;
151 }
152
153 return total;
154 }
155
main(void)156 int main (void)
157 {
158 init_copy_distribution ();
159
160 memset (a, 1, sizeof (a));
161 memset (b, 2, sizeof (b));
162
163 printf("Random memcpy:\n");
164 for (int f = 0; funtab[f].name != 0; f++)
165 {
166 size_t total = 0;
167 uint64_t tsum = 0;
168 printf ("%22s (B/ns) ", funtab[f].name);
169 rand32 (0x12345678);
170
171 for (int size = 16384; size <= SIZE; size *= 2)
172 {
173 size_t copy_size = init_copies (size) * ITERS;
174
175 for (int c = 0; c < MAX_COPIES; c++)
176 funtab[f].fun (b + copy[c].dst, a + copy[c].src, copy[c].len);
177
178 uint64_t t = clock_get_ns ();
179 for (int i = 0; i < ITERS; i++)
180 for (int c = 0; c < MAX_COPIES; c++)
181 funtab[f].fun (b + copy[c].dst, a + copy[c].src, copy[c].len);
182 t = clock_get_ns () - t;
183 total += copy_size;
184 tsum += t;
185 printf ("%dK: %.2f ", size / 1024, (double)copy_size / t);
186 }
187 printf( "avg %.2f\n", (double)total / tsum);
188 }
189
190 printf ("\nMedium memcpy:\n");
191 for (int f = 0; funtab[f].name != 0; f++)
192 {
193 printf ("%22s (B/ns) ", funtab[f].name);
194
195 for (int size = 16; size <= 512; size *= 2)
196 {
197 uint64_t t = clock_get_ns ();
198 for (int i = 0; i < ITERS2; i++)
199 funtab[f].fun (b, a, size);
200 t = clock_get_ns () - t;
201 printf ("%d%c: %.2f ", size < 1024 ? size : size / 1024,
202 size < 1024 ? 'B' : 'K', (double)size * ITERS2 / t);
203 }
204 printf ("\n");
205 }
206
207 printf ("\nLarge memcpy:\n");
208 for (int f = 0; funtab[f].name != 0; f++)
209 {
210 printf ("%22s (B/ns) ", funtab[f].name);
211
212 for (int size = 1024; size <= 32768; size *= 2)
213 {
214 uint64_t t = clock_get_ns ();
215 for (int i = 0; i < ITERS3; i++)
216 funtab[f].fun (b, a, size);
217 t = clock_get_ns () - t;
218 printf ("%d%c: %.2f ", size < 1024 ? size : size / 1024,
219 size < 1024 ? 'B' : 'K', (double)size * ITERS3 / t);
220 }
221 printf ("\n");
222 }
223
224 printf ("\nUnaligned forwards memmove:\n");
225 for (int f = 0; funtab[f].name != 0; f++)
226 {
227 printf ("%22s (B/ns) ", funtab[f].name);
228
229 for (int size = 1024; size <= 32768; size *= 2)
230 {
231 uint64_t t = clock_get_ns ();
232 for (int i = 0; i < ITERS3; i++)
233 funtab[f].fun (a, a + 256 + (i & 31), size);
234 t = clock_get_ns () - t;
235 printf ("%d%c: %.2f ", size < 1024 ? size : size / 1024,
236 size < 1024 ? 'B' : 'K', (double)size * ITERS3 / t);
237 }
238 printf ("\n");
239 }
240
241
242 printf ("\nUnaligned backwards memmove:\n");
243 for (int f = 0; funtab[f].name != 0; f++)
244 {
245 printf ("%22s (B/ns) ", funtab[f].name);
246
247 for (int size = 1024; size <= 32768; size *= 2)
248 {
249 uint64_t t = clock_get_ns ();
250 for (int i = 0; i < ITERS3; i++)
251 funtab[f].fun (a + 256 + (i & 31), a, size);
252 t = clock_get_ns () - t;
253 printf ("%d%c: %.2f ", size < 1024 ? size : size / 1024,
254 size < 1024 ? 'B' : 'K', (double)size * ITERS3 / t);
255 }
256 printf ("\n");
257 }
258
259 return 0;
260 }
261