1 | /* Measure memset function throughput with large data sizes. |
2 | Copyright (C) 2017-2024 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 |
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 (ctx: json_ctx, d: (double) cur / i); |
73 | } |
74 | |
75 | static void |
76 | do_test (json_ctx_t *json_ctx, size_t len) |
77 | { |
78 | json_element_object_begin (ctx: json_ctx); |
79 | json_attr_uint (ctx: json_ctx, name: "length" , d: len); |
80 | json_array_begin (ctx: json_ctx, name: "timings" ); |
81 | |
82 | FOR_EACH_IMPL (impl, 0) |
83 | { |
84 | do_one_test (json_ctx, impl, s: (CHAR *) buf1, |
85 | s_end: (CHAR *) buf1 + MIN_PAGE_SIZE - len, n: len); |
86 | alloc_bufs (); |
87 | } |
88 | |
89 | json_array_end (ctx: json_ctx); |
90 | json_element_object_end (ctx: json_ctx); |
91 | } |
92 | |
93 | int |
94 | test_main (void) |
95 | { |
96 | json_ctx_t json_ctx; |
97 | size_t i; |
98 | |
99 | test_init (); |
100 | |
101 | json_init (ctx: &json_ctx, indent_level: 0, stdout); |
102 | |
103 | json_document_begin (ctx: &json_ctx); |
104 | json_attr_string (ctx: &json_ctx, name: "timing_type" , TIMING_TYPE); |
105 | |
106 | json_attr_object_begin (ctx: &json_ctx, name: "functions" ); |
107 | json_attr_object_begin (ctx: &json_ctx, TEST_NAME); |
108 | json_attr_string (ctx: &json_ctx, name: "bench-variant" , s: "walk" ); |
109 | |
110 | json_array_begin (ctx: &json_ctx, name: "ifuncs" ); |
111 | FOR_EACH_IMPL (impl, 0) |
112 | json_element_string (ctx: &json_ctx, s: impl->name); |
113 | json_array_end (ctx: &json_ctx); |
114 | |
115 | json_array_begin (ctx: &json_ctx, name: "results" ); |
116 | for (i = 1; i <= 64; i++) |
117 | do_test (json_ctx: &json_ctx, len: i); |
118 | |
119 | for (i = START_SIZE; i <= MIN_PAGE_SIZE; i <<= 1) |
120 | { |
121 | do_test (json_ctx: &json_ctx, len: i); |
122 | do_test (json_ctx: &json_ctx, len: i + 1); |
123 | } |
124 | |
125 | json_array_end (ctx: &json_ctx); |
126 | json_attr_object_end (ctx: &json_ctx); |
127 | json_attr_object_end (ctx: &json_ctx); |
128 | json_document_end (ctx: &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 | |