1 /*
2 * Copyright (c) 2000-2001, 2004 Proofpoint, Inc. and its suppliers.
3 * All rights reserved.
4 *
5 * By using this file, you agree to the terms and conditions set
6 * forth in the LICENSE file which can be found at the top level of
7 * the sendmail distribution.
8 */
9
10 #include <sm/gen.h>
11 SM_RCSID("@(#)$Id: b-strcmp.c,v 1.15 2013-11-22 20:51:42 ca Exp $")
12 #include <stdio.h>
13 #include <stdlib.h>
14 #include <unistd.h>
15 #include <sys/types.h>
16 #include <sm/time.h>
17 #include <sm/string.h>
18
19 #define toseconds(x, y) (x.tv_sec - y.tv_sec)
20 #define SIZE 512
21 #define LOOPS 4000000L /* initial number of loops */
22 #define MAXTIME 30L /* "maximum" time to run single test */
23
24 void fatal __P((char *));
25 void purpose __P((void));
26 int main __P((int, char *[]));
27
28 void
fatal(str)29 fatal(str)
30 char *str;
31 {
32 perror(str);
33 exit(1);
34 }
35
36 void
purpose()37 purpose()
38 {
39 printf("This program benchmarks the performance differences between\n");
40 printf("strcasecmp() and sm_strcasecmp().\n");
41 printf("These tests may take several minutes to complete.\n");
42 }
43
44 int
main(argc,argv)45 main(argc, argv)
46 int argc;
47 char *argv[];
48 {
49 long a;
50 int k;
51 bool doit = false;
52 long loops;
53 long j;
54 long one, two;
55 struct timeval t1, t2;
56 char src1[SIZE], src2[SIZE];
57
58 # define OPTIONS "d"
59 while ((k = getopt(argc, argv, OPTIONS)) != -1)
60 {
61 switch ((char) k)
62 {
63 case 'd':
64 doit = true;
65 break;
66
67 default:
68 break;
69 }
70 }
71
72 if (!doit)
73 {
74 purpose();
75 printf("If you want to run it, specify -d as option.\n");
76 return 0;
77 }
78
79 /* Run-time comments to the user */
80 purpose();
81 printf("\n");
82 for (k = 0; k < 3; k++)
83 {
84 switch (k)
85 {
86 case 0:
87 (void) sm_strlcpy(src1, "1234567890", SIZE);
88 (void) sm_strlcpy(src2, "1234567890", SIZE);
89 break;
90 case 1:
91 (void) sm_strlcpy(src1, "1234567890", SIZE);
92 (void) sm_strlcpy(src2, "1234567891", SIZE);
93 break;
94 case 2:
95 (void) sm_strlcpy(src1, "1234567892", SIZE);
96 (void) sm_strlcpy(src2, "1234567891", SIZE);
97 break;
98 }
99 printf("Test %d: strcasecmp(%s, %s) versus sm_strcasecmp()\n",
100 k, src1, src2);
101 loops = LOOPS;
102 for (;;)
103 {
104 j = 0;
105 if (gettimeofday(&t1, NULL) < 0)
106 fatal("gettimeofday");
107 for (a = 0; a < loops; a++)
108 j += strcasecmp(src1, src2);
109 if (gettimeofday(&t2, NULL) < 0)
110 fatal("gettimeofday");
111 one = toseconds(t2, t1);
112 printf("\tstrcasecmp() result: %ld seconds [%ld]\n",
113 one, j);
114
115 j = 0;
116 if (gettimeofday(&t1, NULL) < 0)
117 fatal("gettimeofday");
118 for (a = 0; a < loops; a++)
119 j += sm_strcasecmp(src1, src2);
120 if (gettimeofday(&t2, NULL) < 0)
121 fatal("gettimeofday");
122 two = toseconds(t2, t1);
123 printf("\tsm_strcasecmp() result: %ld seconds [%ld]\n",
124 two, j);
125
126 if (abs(one - two) > 2)
127 break;
128 loops += loops;
129 if (loops < 0L || one > MAXTIME)
130 {
131 printf("\t\t** results too close: no decision\n");
132 break;
133 }
134 else
135 {
136 printf("\t\t** results too close redoing test %ld times **\n",
137 loops);
138 }
139 }
140 }
141
142 printf("\n\n");
143 printf("Interpreting the results:\n");
144 printf("\tFor differences larger than 2 seconds, the lower value is\n");
145 printf("\tbetter and that function should be used for performance\n");
146 printf("\treasons.\n\n");
147 printf("This program will re-run the tests when the difference is\n");
148 printf("less than 2 seconds.\n");
149 printf("The result will vary depending on the compiler optimization\n"); printf("level used. Compiling the sendmail libsm library with a\n");
150 printf("better optimization level can change the results.\n");
151 return 0;
152 }
153