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.
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.
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.
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/>. */
21 # define TEST_NAME "memset"
23 # define TEST_NAME "bzero"
25 #define START_SIZE 128
26 #define MIN_PAGE_SIZE (getpagesize () + 32 * 1024 * 1024)
27 #define TIMEOUT (20 * 60)
28 #include "bench-string.h"
33 void *generic_memset (void *, int, size_t);
35 typedef void *(*proto_t) (void *, int, size_t);
38 IMPL (generic_memset, 0)
42 memset_zero (void * s, size_t len)
44 memset (s, '\0', len);
47 typedef void (*proto_t) (void *, size_t);
54 do_one_test (json_ctx_t *json_ctx, impl_t *impl, CHAR *s, CHAR *s_end,
57 size_t i, iters = MIN_PAGE_SIZE / n;
58 timing_t start, stop, cur;
61 for (i = 0; i < iters && s <= s_end; s_end -= n, i++)
69 TIMING_DIFF (cur, start, stop);
71 /* Get time taken per function call. */
72 json_element_double (json_ctx, (double) cur / i);
76 do_test (json_ctx_t *json_ctx, size_t len)
78 json_element_object_begin (json_ctx);
79 json_attr_uint (json_ctx, "length", len);
80 json_array_begin (json_ctx, "timings");
82 FOR_EACH_IMPL (impl, 0)
84 do_one_test (json_ctx, impl, (CHAR *) buf1,
85 (CHAR *) buf1 + MIN_PAGE_SIZE - len, len);
89 json_array_end (json_ctx);
90 json_element_object_end (json_ctx);
101 json_init (&json_ctx, 0, stdout);
103 json_document_begin (&json_ctx);
104 json_attr_string (&json_ctx, "timing_type", TIMING_TYPE);
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");
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);
115 json_array_begin (&json_ctx, "results");
116 for (i = 1; i <= 64; i++)
117 do_test (&json_ctx, i);
119 for (i = START_SIZE; i <= MIN_PAGE_SIZE; i <<= 1)
121 do_test (&json_ctx, i);
122 do_test (&json_ctx, i + 1);
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);
133 #include <support/test-driver.c>
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)
141 # define MEMSET generic_memset
142 # include <string/memset.c>