1 /*
2 * memset benchmark.
3 *
4 * Copyright (c) 2021, Arm Limited.
5 * SPDX-License-Identifier: MIT OR Apache-2.0 WITH LLVM-exception
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 1000000
19 #define NUM_TESTS 16384
20 #define MIN_SIZE 32768
21 #define MAX_SIZE (1024 * 1024)
22
23 static uint8_t a[MAX_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 *, int, size_t);
31 } funtab[] =
32 {
33 #if __aarch64__
34 F(__memset_aarch64)
35 #elif __arm__
36 F(__memset_arm)
37 #endif
38 F(memset)
39 #undef F
40 {0, 0}
41 };
42
43 typedef struct { uint32_t offset : 20, len : 12; } memset_test_t;
44 static memset_test_t test_arr[NUM_TESTS];
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 len_arr[SIZE_NUM];
52
53 /* Frequency data for memset sizes up to 4096 based on SPEC2017. */
54 static freq_data_t memset_len_freq[] =
55 {
56 {40,28817}, {32,15336}, { 16,3823}, {296,3545}, { 24,3454}, { 8,1412},
57 {292,1202}, { 48, 927}, { 12, 613}, { 11, 539}, {284, 493}, {108, 414},
58 { 88, 380}, { 20, 295}, {312, 271}, { 72, 233}, { 2, 200}, { 4, 192},
59 { 15, 180}, { 14, 174}, { 13, 160}, { 56, 151}, { 36, 144}, { 64, 140},
60 {4095,133}, { 10, 130}, { 9, 124}, { 3, 124}, { 28, 120}, { 0, 118},
61 {288, 110}, {1152, 96}, {104, 90}, { 1, 86}, {832, 76}, {248, 74},
62 {1024, 69}, {120, 64}, {512, 63}, {384, 60}, { 6, 59}, { 80, 54},
63 { 17, 50}, { 7, 49}, {520, 47}, {2048, 39}, {256, 37}, {864, 33},
64 {1440, 28}, { 22, 27}, {2056, 24}, {260, 23}, { 68, 23}, { 5, 22},
65 { 18, 21}, {200, 18}, {2120, 18}, { 60, 17}, { 52, 16}, {336, 15},
66 { 44, 13}, {192, 13}, {160, 12}, {2064, 12}, {128, 12}, { 76, 11},
67 {164, 11}, {152, 10}, {136, 9}, {488, 7}, { 96, 6}, {560, 6},
68 {1016, 6}, {112, 5}, {232, 5}, {168, 5}, {952, 5}, {184, 5},
69 {144, 4}, {252, 4}, { 84, 3}, {960, 3}, {3808, 3}, {244, 3},
70 {280, 3}, {224, 3}, {156, 3}, {1088, 3}, {440, 3}, {216, 2},
71 {304, 2}, { 23, 2}, { 25, 2}, { 26, 2}, {264, 2}, {328, 2},
72 {1096, 2}, {240, 2}, {1104, 2}, {704, 2}, {1664, 2}, {360, 2},
73 {808, 1}, {544, 1}, {236, 1}, {720, 1}, {368, 1}, {424, 1},
74 {640, 1}, {1112, 1}, {552, 1}, {272, 1}, {776, 1}, {376, 1},
75 { 92, 1}, {536, 1}, {824, 1}, {496, 1}, {760, 1}, {792, 1},
76 {504, 1}, {344, 1}, {1816, 1}, {880, 1}, {176, 1}, {320, 1},
77 {352, 1}, {2008, 1}, {208, 1}, {408, 1}, {228, 1}, {2072, 1},
78 {568, 1}, {220, 1}, {616, 1}, {600, 1}, {392, 1}, {696, 1},
79 {2144, 1}, {1280, 1}, {2136, 1}, {632, 1}, {584, 1}, {456, 1},
80 {472, 1}, {3440, 1}, {2088, 1}, {680, 1}, {2928, 1}, {212, 1},
81 {648, 1}, {1752, 1}, {664, 1}, {3512, 1}, {1032, 1}, {528, 1},
82 {4072, 1}, {204, 1}, {2880, 1}, {3392, 1}, {712, 1}, { 59, 1},
83 {736, 1}, {592, 1}, {2520, 1}, {744, 1}, {196, 1}, {172, 1},
84 {728, 1}, {2040, 1}, {1192, 1}, {3600, 1}, {0, 0}
85 };
86
87 #define ALIGN_NUM 1024
88 #define ALIGN_MASK (ALIGN_NUM-1)
89 static uint8_t align_arr[ALIGN_NUM];
90
91 /* Alignment data for memset based on SPEC2017. */
92 static align_data_t memset_align_freq[] =
93 {
94 {16, 338}, {8, 307}, {32, 148}, {64, 131}, {4, 72}, {1, 23}, {2, 5}, {0, 0}
95 };
96
97 static void
init_memset_distribution(void)98 init_memset_distribution (void)
99 {
100 int i, j, freq, size, n;
101
102 for (n = i = 0; (freq = memset_len_freq[i].freq) != 0; i++)
103 for (j = 0, size = memset_len_freq[i].size; j < freq; j++)
104 len_arr[n++] = size;
105 assert (n == SIZE_NUM);
106
107 for (n = i = 0; (freq = memset_align_freq[i].freq) != 0; i++)
108 for (j = 0, size = memset_align_freq[i].align; j < freq; j++)
109 align_arr[n++] = size - 1;
110 assert (n == ALIGN_NUM);
111 }
112
113 static size_t
init_memset(size_t max_size)114 init_memset (size_t max_size)
115 {
116 size_t total = 0;
117 /* Create a random set of memsets with the given size and alignment
118 distributions. */
119 for (int i = 0; i < NUM_TESTS; i++)
120 {
121 test_arr[i].offset = (rand32 (0) & (max_size - 1));
122 test_arr[i].offset &= ~align_arr[rand32 (0) & ALIGN_MASK];
123 test_arr[i].len = len_arr[rand32 (0) & SIZE_MASK];
124 total += test_arr[i].len;
125 }
126
127 return total;
128 }
129
130
main(void)131 int main (void)
132 {
133 init_memset_distribution ();
134
135 memset (a, 1, sizeof (a));
136
137 printf("Random memset (bytes/ns):\n");
138 for (int f = 0; funtab[f].name != 0; f++)
139 {
140 size_t total_size = 0;
141 uint64_t tsum = 0;
142 printf ("%22s ", funtab[f].name);
143 rand32 (0x12345678);
144
145 for (int size = MIN_SIZE; size <= MAX_SIZE; size *= 2)
146 {
147 size_t memset_size = init_memset (size) * ITERS;
148
149 for (int c = 0; c < NUM_TESTS; c++)
150 funtab[f].fun (a + test_arr[c].offset, 0, test_arr[c].len);
151
152 uint64_t t = clock_get_ns ();
153 for (int i = 0; i < ITERS; i++)
154 for (int c = 0; c < NUM_TESTS; c++)
155 funtab[f].fun (a + test_arr[c].offset, 0, test_arr[c].len);
156 t = clock_get_ns () - t;
157 total_size += memset_size;
158 tsum += t;
159 printf ("%dK: %.2f ", size / 1024, (double)memset_size / t);
160 }
161 printf( "avg %.2f\n", (double)total_size / tsum);
162 }
163
164 size_t total_size = 0;
165 uint64_t tsum = 0;
166 printf ("%22s ", "memset_call");
167 rand32 (0x12345678);
168
169 for (int size = MIN_SIZE; size <= MAX_SIZE; size *= 2)
170 {
171 size_t memset_size = init_memset (size) * ITERS;
172
173 for (int c = 0; c < NUM_TESTS; c++)
174 memset (a + test_arr[c].offset, 0, test_arr[c].len);
175
176 uint64_t t = clock_get_ns ();
177 for (int i = 0; i < ITERS; i++)
178 for (int c = 0; c < NUM_TESTS; c++)
179 memset (a + test_arr[c].offset, 0, test_arr[c].len);
180 t = clock_get_ns () - t;
181 total_size += memset_size;
182 tsum += t;
183 printf ("%dK: %.2f ", size / 1024, (double)memset_size / t);
184 }
185 printf( "avg %.2f\n", (double)total_size / tsum);
186
187
188 printf ("\nMedium memset (bytes/ns):\n");
189 for (int f = 0; funtab[f].name != 0; f++)
190 {
191 printf ("%22s ", funtab[f].name);
192
193 for (int size = 8; size <= 512; size *= 2)
194 {
195 uint64_t t = clock_get_ns ();
196 for (int i = 0; i < ITERS2; i++)
197 funtab[f].fun (a, 0, size);
198 t = clock_get_ns () - t;
199 printf ("%dB: %.2f ", size, (double)size * ITERS2 / t);
200 }
201 printf ("\n");
202 }
203
204 printf ("%22s ", "memset_call");
205 for (int size = 8; size <= 512; size *= 2)
206 {
207 uint64_t t = clock_get_ns ();
208 for (int i = 0; i < ITERS2; i++)
209 memset (a, 0, size);
210 t = clock_get_ns () - t;
211 printf ("%dB: %.2f ", size, (double)size * ITERS2 / t);
212 }
213
214
215 printf ("\nLarge memset (bytes/ns):\n");
216 for (int f = 0; funtab[f].name != 0; f++)
217 {
218 printf ("%22s ", funtab[f].name);
219
220 for (int size = 1024; size <= 65536; size *= 2)
221 {
222 uint64_t t = clock_get_ns ();
223 for (int i = 0; i < ITERS3; i++)
224 funtab[f].fun (a, 0, size);
225 t = clock_get_ns () - t;
226 printf ("%dK: %.2f ", size / 1024, (double)size * ITERS3 / t);
227 }
228 printf ("\n");
229 }
230
231 printf ("%22s ", "memset_call");
232 for (int size = 1024; size <= 65536; size *= 2)
233 {
234 uint64_t t = clock_get_ns ();
235 for (int i = 0; i < ITERS3; i++)
236 memset (a, 0, size);
237 t = clock_get_ns () - t;
238 printf ("%dK: %.2f ", size / 1024, (double)size * ITERS3 / t);
239 }
240 printf ("\n\n");
241
242 return 0;
243 }
244