tools/regression/environ/timings.c

   1 /*-
   2  * Copyright (c) 2007 Sean C. Farley <scf@FreeBSD.org>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  */
  26 #include <sys/types.h>
  27 #include <sys/time.h>
  28 #include <sys/resource.h>
  29 #include <err.h>
  30 #include <stdio.h>
  31 #include <stdlib.h>
  32 #include <string.h>
  33 #include <unistd.h>
  34
  35
  36 #include <sys/cdefs.h>
  37 const char value1[] = "Large ------------------ value";
  38 const char value2[] = "Small -- value";
  39 char nameValuePair[] = "less=more";
  40 const char name[] = "PATH";
  41 const char name2[] = "SHELL";
  42 const int MaxIterations = 1000000;
  43 const char Tabs[] = "\t\t\t";
  44
  45
  46 static int
  47 report_time(const char *action, struct timeval *startTime,
  48     struct timeval *endTime)
  49 {
  50         int actionLen;
  51         int numTabs;
  52
  53         actionLen = strlen(action);
  54         numTabs = 3 - actionLen / 8;
  55
  56         return (printf("Time spent executing %s:%.*s%f\n", action, numTabs, Tabs,
  57             (endTime->tv_sec - startTime->tv_sec) +
  58             (double)(endTime->tv_usec - startTime->tv_usec) / 1000000));
  59 }
  60
  61
  62 int
  63 main(int argc, char **argv)
  64 {
  65         int iterations;
  66         struct rusage endUsage;
  67         struct rusage startUsage;
  68
  69         /*
  70          * getenv() on the existing environment.
  71          */
  72         getrusage(RUSAGE_SELF, &startUsage);
  73
  74         /* Iterate over setting variable. */
  75         for (iterations = 0; iterations < MaxIterations; iterations++)
  76                 if (getenv(name) == NULL)
  77                         err(EXIT_FAILURE, "getenv(name)");
  78
  79         getrusage(RUSAGE_SELF, &endUsage);
  80
  81         report_time("getenv(name)", &startUsage.ru_utime, &endUsage.ru_utime);
  82
  83
  84         /*
  85          * setenv() a variable with a large value.
  86          */
  87         getrusage(RUSAGE_SELF, &startUsage);
  88
  89         /* Iterate over setting variable. */
  90         for (iterations = 0; iterations < MaxIterations; iterations++)
  91                 if (setenv(name, value1, 1) == -1)
  92                         err(EXIT_FAILURE, "setenv(name, value1, 1)");
  93
  94         getrusage(RUSAGE_SELF, &endUsage);
  95
  96         report_time("setenv(name, value1, 1)", &startUsage.ru_utime,
  97             &endUsage.ru_utime);
  98
  99
 100         /*
 101          * getenv() the new variable on the new environment.
 102          */
 103         getrusage(RUSAGE_SELF, &startUsage);
 104
 105         /* Iterate over setting variable. */
 106         for (iterations = 0; iterations < MaxIterations; iterations++)
 107                 /* Set large value to variable. */
 108                 if (getenv(name) == NULL)
 109                         err(EXIT_FAILURE, "getenv(name)");
 110
 111         getrusage(RUSAGE_SELF, &endUsage);
 112
 113         report_time("getenv(name)", &startUsage.ru_utime, &endUsage.ru_utime);
 114
 115
 116         /*
 117          * getenv() a different variable on the new environment.
 118          */
 119         getrusage(RUSAGE_SELF, &startUsage);
 120
 121         /* Iterate over setting variable. */
 122         for (iterations = 0; iterations < MaxIterations; iterations++)
 123                 /* Set large value to variable. */
 124                 if (getenv(name2) == NULL)
 125                         err(EXIT_FAILURE, "getenv(name2)");
 126
 127         getrusage(RUSAGE_SELF, &endUsage);
 128
 129         report_time("getenv(name2)", &startUsage.ru_utime, &endUsage.ru_utime);
 130
 131
 132         /*
 133          * setenv() a variable with a small value.
 134          */
 135         getrusage(RUSAGE_SELF, &startUsage);
 136
 137         /* Iterate over setting variable. */
 138         for (iterations = 0; iterations < MaxIterations; iterations++)
 139                 if (setenv(name, value2, 1) == -1)
 140                         err(EXIT_FAILURE, "setenv(name, value2, 1)");
 141
 142         getrusage(RUSAGE_SELF, &endUsage);
 143
 144         report_time("setenv(name, value2, 1)", &startUsage.ru_utime,
 145             &endUsage.ru_utime);
 146
 147
 148         /*
 149          * getenv() a different variable on the new environment.
 150          */
 151         getrusage(RUSAGE_SELF, &startUsage);
 152
 153         /* Iterate over setting variable. */
 154         for (iterations = 0; iterations < MaxIterations; iterations++)
 155                 /* Set large value to variable. */
 156                 if (getenv(name2) == NULL)
 157                         err(EXIT_FAILURE, "getenv(name)");
 158
 159         getrusage(RUSAGE_SELF, &endUsage);
 160
 161         report_time("getenv(name)", &startUsage.ru_utime, &endUsage.ru_utime);
 162
 163
 164         /*
 165          * getenv() a different variable on the new environment.
 166          */
 167         getrusage(RUSAGE_SELF, &startUsage);
 168
 169         /* Iterate over setting variable. */
 170         for (iterations = 0; iterations < MaxIterations; iterations++)
 171                 /* Set large value to variable. */
 172                 if (getenv(name2) == NULL)
 173                         err(EXIT_FAILURE, "getenv(name2)");
 174
 175         getrusage(RUSAGE_SELF, &endUsage);
 176
 177         report_time("getenv(name2)", &startUsage.ru_utime, &endUsage.ru_utime);
 178
 179
 180         /*
 181          * putenv() a variable with a small value.
 182          */
 183         getrusage(RUSAGE_SELF, &startUsage);
 184
 185         /* Iterate over setting variable. */
 186         for (iterations = 0; iterations < MaxIterations; iterations++)
 187                 if (putenv(nameValuePair) == -1)
 188                         err(EXIT_FAILURE, "putenv(nameValuePair)");
 189
 190         getrusage(RUSAGE_SELF, &endUsage);
 191
 192         report_time("putenv(nameValuePair)", &startUsage.ru_utime,
 193             &endUsage.ru_utime);
 194
 195
 196         exit(EXIT_SUCCESS);
 197 }