1/* Measure memset functions with large data sizes.
2 Copyright (C) 2016-2022 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#define TEST_NAME "memset"
21#define START_SIZE (128 * 1024)
22#define MIN_PAGE_SIZE (getpagesize () + 64 * 1024 * 1024)
23#define TIMEOUT (20 * 60)
24#include "bench-string.h"
25
26#include "json-lib.h"
27
28void *generic_memset (void *, int, size_t);
29typedef void *(*proto_t) (void *, int, size_t);
30
31IMPL (MEMSET, 1)
32IMPL (generic_memset, 0)
33
34static void
35do_one_test (json_ctx_t *json_ctx, impl_t *impl, CHAR *s,
36 int c __attribute ((unused)), size_t n)
37{
38 size_t i, iters = 16;
39 timing_t start, stop, cur;
40
41 TIMING_NOW (start);
42 for (i = 0; i < iters; ++i)
43 {
44 CALL (impl, s, c, n);
45 }
46 TIMING_NOW (stop);
47
48 TIMING_DIFF (cur, start, stop);
49
50 json_element_double (ctx: json_ctx, d: (double) cur / (double) iters);
51}
52
53static void
54do_test (json_ctx_t *json_ctx, size_t align, int c, size_t len)
55{
56 align &= 63;
57 if ((align + len) * sizeof (CHAR) > page_size)
58 return;
59
60 json_element_object_begin (ctx: json_ctx);
61 json_attr_uint (ctx: json_ctx, name: "length", d: len);
62 json_attr_uint (ctx: json_ctx, name: "alignment", d: align);
63 json_attr_int (ctx: json_ctx, name: "char", d: c);
64 json_array_begin (ctx: json_ctx, name: "timings");
65
66 FOR_EACH_IMPL (impl, 0)
67 {
68 do_one_test (json_ctx, impl, s: (CHAR *) (buf1) + align, c, n: len);
69 alloc_bufs ();
70 }
71
72 json_array_end (ctx: json_ctx);
73 json_element_object_end (ctx: json_ctx);
74}
75
76int
77test_main (void)
78{
79 json_ctx_t json_ctx;
80 size_t i;
81 int c;
82
83 test_init ();
84
85 json_init (ctx: &json_ctx, indent_level: 0, stdout);
86
87 json_document_begin (ctx: &json_ctx);
88 json_attr_string (ctx: &json_ctx, name: "timing_type", TIMING_TYPE);
89
90 json_attr_object_begin (ctx: &json_ctx, name: "functions");
91 json_attr_object_begin (ctx: &json_ctx, TEST_NAME);
92 json_attr_string (ctx: &json_ctx, name: "bench-variant", s: "large");
93
94 json_array_begin (ctx: &json_ctx, name: "ifuncs");
95 FOR_EACH_IMPL (impl, 0)
96 json_element_string (ctx: &json_ctx, s: impl->name);
97 json_array_end (ctx: &json_ctx);
98
99 json_array_begin (ctx: &json_ctx, name: "results");
100
101 c = 65;
102 for (i = START_SIZE; i <= MIN_PAGE_SIZE; i <<= 1)
103 {
104 do_test (json_ctx: &json_ctx, align: 0, c, len: i);
105 do_test (json_ctx: &json_ctx, align: 3, c, len: i);
106 }
107
108 json_array_end (ctx: &json_ctx);
109 json_attr_object_end (ctx: &json_ctx);
110 json_attr_object_end (ctx: &json_ctx);
111 json_document_end (ctx: &json_ctx);
112
113 return ret;
114}
115
116#include <support/test-driver.c>
117
118#define libc_hidden_builtin_def(X)
119#define libc_hidden_def(X)
120#define libc_hidden_weak(X)
121#define weak_alias(X,Y)
122#undef MEMSET
123#define MEMSET generic_memset
124#include <string/memset.c>
125

source code of glibc/benchtests/bench-memset-large.c