1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
|
/*
* Copyright (c) 2000-2001 Sendmail, Inc. and its suppliers.
* All rights reserved.
*
* By using this file, you agree to the terms and conditions set
* forth in the LICENSE file which can be found at the top level of
* the sendmail distribution.
*
*/
/*
** Compile this program using a command line similar to:
** cc -O -L../OBJ/libsm -o b-strl b-strl.c -lsm
** where "OBJ" is the name of the object directory for the platform
** you are compiling on.
** Then run the program:
** ./b-strl
** and read the output for results and how to interpret the results.
*/
#include <sm/gen.h>
SM_RCSID("@(#)$Id: b-strl.c,v 1.24 2001/09/11 04:04:47 gshapiro Exp $")
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sm/string.h>
#define SRC_SIZE 512
#define toseconds(x, y) (x.tv_sec - y.tv_sec)
#define LOOPS 4000000L /* initial number of loops */
#define MAXTIME 30L /* "maximum" time to run single test */
void
fatal(str)
char *str;
{
perror(str);
exit(1);
}
void
purpose()
{
printf("This program benchmarks the performance differences between\n");
printf("strlcpy() and sm_strlcpy(), and strlcat() and sm_strlcat().\n");
printf("These tests may take several minutes to complete.\n");
}
int
main(argc, argv)
int argc;
char *argv[];
{
#if !SM_CONF_STRL
printf("The configuration indicates the system needs the libsm\n");
printf("versions of strlcpy(3) and strlcat(3). Thus, performing\n");
printf("these tests will not be of much use.\n");
printf("If your OS has strlcpy(3) and strlcat(3) then set the macro\n");
printf("SM_CONF_STRL to 1 in your site.config.m4 file\n");
printf("(located in ../devtools/Site) and recompile this program.\n");
#else /* !SM_CONF_STRL */
int ch;
long a;
bool doit = false;
long loops = LOOPS;
long one, two;
struct timeval t1, t2;
char dest[SRC_SIZE], source[SRC_SIZE];
# define OPTIONS "d"
while ((ch = getopt(argc, argv, OPTIONS)) != -1)
{
switch ((char) ch)
{
case 'd':
doit = true;
break;
default:
break;
}
}
if (!doit)
{
purpose();
printf("If you want to run it, specify -d as option.\n");
return 0;
}
/*
** Let's place a small string at the head of dest for
** catenation to happen (it'll be ignored for the copy).
*/
(void) sm_strlcpy(dest, "a small string at the start! ", SRC_SIZE - 1);
/*
** Let's place a larger string into source for the catenation and
** the copy.
*/
(void) strlcpy(source,
" This is the longer string that will be used for catenation and copying for the the performace testing. The longer the string being catenated or copied the greater the difference in measureable performance\n",
SRC_SIZE - 1);
/* Run-time comments to the user */
purpose();
printf("\n");
printf("Test 1: strlcat() versus sm_strlcat()\n");
redo_cat:
if (gettimeofday(&t1, NULL) < 0)
fatal("gettimeofday");
for (a = 0; a < loops; a++)
strlcat(dest, source, SRC_SIZE - 1);
if (gettimeofday(&t2, NULL) < 0)
fatal("gettimeofday");
printf("\tstrlcat() result: %ld seconds\n", one = toseconds(t2, t1));
if (gettimeofday(&t1, NULL) < 0)
fatal("gettimeofday");
for (a = 0; a < loops; a++)
sm_strlcat(dest, source, SRC_SIZE - 1);
if (gettimeofday(&t2, NULL) < 0)
fatal("gettimeofday");
printf("\tsm_strlcat() result: %ld seconds\n", two = toseconds(t2, t1));
if (one - two >= -2 && one - two <= 2)
{
loops += loops;
if (loops < 0L || one > MAXTIME)
{
printf("\t\t** results too close: no decision\n");
}
else
{
printf("\t\t** results too close redoing test %ld times **\n",
loops);
goto redo_cat;
}
}
printf("\n");
printf("Test 2: strlcpy() versus sm_strlpy()\n");
loops = LOOPS;
redo_cpy:
if (gettimeofday(&t1, NULL) < 0)
fatal("gettimeofday");
for (a = 0; a < loops; a++)
strlcpy(dest, source, SRC_SIZE - 1);
if (gettimeofday(&t2, NULL) < 0)
fatal("gettimeofday");
printf("\tstrlcpy() result: %ld seconds\n", one = toseconds(t2, t1));
if (gettimeofday(&t1, NULL) < 0)
fatal("gettimeofday");
for (a = 0; a < loops; a++)
sm_strlcpy(dest, source, SRC_SIZE - 1);
if (gettimeofday(&t2, NULL) < 0)
fatal("gettimeofday");
printf("\tsm_strlcpy() result: %ld seconds\n", two = toseconds(t2, t1));
if (one - two >= -2 && one - two <= 2)
{
loops += loops;
if (loops < 0L || one > MAXTIME)
{
printf("\t\t** results too close: no decision\n");
}
else
{
printf("\t\t** results too close redoing test %ld times **\n",
loops);
goto redo_cpy;
}
}
printf("\n\n");
printf("Interpreting the results:\n");
printf("\tFor differences larger than 2 seconds, the lower value is\n");
printf("\tbetter and that function should be used for performance\n");
printf("\treasons.\n\n");
printf("This program will re-run the tests when the difference is\n");
printf("less than 2 seconds.\n");
printf("The result will vary depending on the compiler optimization\n"); printf("level used. Compiling the sendmail libsm library with a\n");
printf("better optimization level can change the results.\n");
#endif /* !SM_CONF_STRL */
return 0;
}
|
