1 /* Measure memset function throughput with large data sizes.
2 Copyright (C) 2017-2022 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 TEST_MAIN
20 #ifdef DO_MEMSET
21 # define TEST_NAME "memset"
22 #else
23 # define TEST_NAME "bzero"
24 #endif
25 #define START_SIZE 128
26 #define MIN_PAGE_SIZE (getpagesize () + 32 * 1024 * 1024)
27 #define TIMEOUT (20 * 60)
28 #include "bench-string.h"
29
30 #include "json-lib.h"
31
32 #ifdef DO_MEMSET
33 void *generic_memset (void *, int, size_t);
34
35 typedef void *(*proto_t) (void *, int, size_t);
36
37 IMPL (memset, 1)
38 IMPL (generic_memset, 0)
39
40 #else
41 static void
42 memset_zero (void * s, size_t len)
43 {
44 memset (s, '\0', len);
45 }
46
47 typedef void (*proto_t) (void *, size_t);
48
49 IMPL (bzero, 1)
50 IMPL (memset_zero, 0)
51 #endif
52
53 static void
do_one_test(json_ctx_t * json_ctx,impl_t * impl,CHAR * s,CHAR * s_end,size_t n)54 do_one_test (json_ctx_t *json_ctx, impl_t *impl, CHAR *s, CHAR *s_end,
55 size_t n)
56 {
57 size_t i, iters = MIN_PAGE_SIZE / n;
58 timing_t start, stop, cur;
59
60 TIMING_NOW (start);
61 for (i = 0; i < iters && s <= s_end; s_end -= n, i++)
62 #ifdef DO_MEMSET
63 CALL (impl, s, 0, n);
64 #else
65 CALL (impl, s, n);
66 #endif
67 TIMING_NOW (stop);
68
69 TIMING_DIFF (cur, start, stop);
70
71 /* Get time taken per function call. */
72 json_element_double (json_ctx, (double) cur / i);
73 }
74
75 static void
do_test(json_ctx_t * json_ctx,size_t len)76 do_test (json_ctx_t *json_ctx, size_t len)
77 {
78 json_element_object_begin (json_ctx);
79 json_attr_uint (json_ctx, "length", len);
80 json_array_begin (json_ctx, "timings");
81
82 FOR_EACH_IMPL (impl, 0)
83 {
84 do_one_test (json_ctx, impl, (CHAR *) buf1,
85 (CHAR *) buf1 + MIN_PAGE_SIZE - len, len);
86 alloc_bufs ();
87 }
88
89 json_array_end (json_ctx);
90 json_element_object_end (json_ctx);
91 }
92
93 int
test_main(void)94 test_main (void)
95 {
96 json_ctx_t json_ctx;
97 size_t i;
98
99 test_init ();
100
101 json_init (&json_ctx, 0, stdout);
102
103 json_document_begin (&json_ctx);
104 json_attr_string (&json_ctx, "timing_type", TIMING_TYPE);
105
106 json_attr_object_begin (&json_ctx, "functions");
107 json_attr_object_begin (&json_ctx, TEST_NAME);
108 json_attr_string (&json_ctx, "bench-variant", "walk");
109
110 json_array_begin (&json_ctx, "ifuncs");
111 FOR_EACH_IMPL (impl, 0)
112 json_element_string (&json_ctx, impl->name);
113 json_array_end (&json_ctx);
114
115 json_array_begin (&json_ctx, "results");
116 for (i = 1; i <= 64; i++)
117 do_test (&json_ctx, i);
118
119 for (i = START_SIZE; i <= MIN_PAGE_SIZE; i <<= 1)
120 {
121 do_test (&json_ctx, i);
122 do_test (&json_ctx, i + 1);
123 }
124
125 json_array_end (&json_ctx);
126 json_attr_object_end (&json_ctx);
127 json_attr_object_end (&json_ctx);
128 json_document_end (&json_ctx);
129
130 return ret;
131 }
132
133 #include <support/test-driver.c>
134
135 #ifdef DO_MEMSET
136 # define libc_hidden_builtin_def(X)
137 # define libc_hidden_def(X)
138 # define libc_hidden_weak(X)
139 # define weak_alias(X,Y)
140 # undef MEMSET
141 # define MEMSET generic_memset
142 # include <string/memset.c>
143 #endif
144