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git.ipfire.org Git - thirdparty/glibc.git/blob - benchtests/bench-memset-walk.c
1 /* Measure memset function throughput with large data sizes.
2 Copyright (C) 2017-2021 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/>. */
20 #define TEST_NAME "memset"
21 #define START_SIZE 128
22 #define MIN_PAGE_SIZE (getpagesize () + 32 * 1024 * 1024)
23 #define TIMEOUT (20 * 60)
24 #include "bench-string.h"
29 void *generic_memset (void *, int, size_t);
30 typedef void *(*proto_t
) (void *, int, size_t);
33 IMPL (generic_memset
, 0)
36 do_one_test (json_ctx_t
*json_ctx
, impl_t
*impl
, CHAR
*s
, CHAR
*s_end
,
37 int c
__attribute ((unused
)), size_t n
)
39 size_t i
, iters
= MIN_PAGE_SIZE
/ n
;
40 timing_t start
, stop
, cur
;
43 for (i
= 0; i
< iters
&& s
<= s_end
; s_end
-= n
, i
++)
47 TIMING_DIFF (cur
, start
, stop
);
49 /* Get time taken per function call. */
50 json_element_double (json_ctx
, (double) cur
/ i
);
54 do_test (json_ctx_t
*json_ctx
, int c
, size_t len
)
56 json_element_object_begin (json_ctx
);
57 json_attr_uint (json_ctx
, "length", len
);
58 json_attr_uint (json_ctx
, "char", c
);
59 json_array_begin (json_ctx
, "timings");
61 FOR_EACH_IMPL (impl
, 0)
63 do_one_test (json_ctx
, impl
, (CHAR
*) buf1
,
64 (CHAR
*) buf1
+ MIN_PAGE_SIZE
- len
, c
, len
);
68 json_array_end (json_ctx
);
69 json_element_object_end (json_ctx
);
80 json_init (&json_ctx
, 0, stdout
);
82 json_document_begin (&json_ctx
);
83 json_attr_string (&json_ctx
, "timing_type", TIMING_TYPE
);
85 json_attr_object_begin (&json_ctx
, "functions");
86 json_attr_object_begin (&json_ctx
, TEST_NAME
);
87 json_attr_string (&json_ctx
, "bench-variant", "walk");
89 json_array_begin (&json_ctx
, "ifuncs");
90 FOR_EACH_IMPL (impl
, 0)
91 json_element_string (&json_ctx
, impl
->name
);
92 json_array_end (&json_ctx
);
94 json_array_begin (&json_ctx
, "results");
95 for (i
= START_SIZE
; i
<= MIN_PAGE_SIZE
; i
<<= 1)
97 do_test (&json_ctx
, 65, i
);
98 do_test (&json_ctx
, 65, i
+ 1);
101 for (i
= START_SIZE
; i
<= MIN_PAGE_SIZE
; i
<<= 1)
103 do_test (&json_ctx
, 0, i
);
104 do_test (&json_ctx
, 0, i
+ 1);
107 json_array_end (&json_ctx
);
108 json_attr_object_end (&json_ctx
);
109 json_attr_object_end (&json_ctx
);
110 json_document_end (&json_ctx
);
115 #include <support/test-driver.c>
117 #define libc_hidden_builtin_def(X)
118 #define libc_hidden_def(X)
119 #define libc_hidden_weak(X)
120 #define weak_alias(X,Y)
122 #define MEMSET generic_memset
123 #include <string/memset.c>