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 __FBSDID("$FreeBSD$");
  38
  39
  40 const char value1[] = "Large ------------------ value";
  41 const char value2[] = "Small -- value";
  42 char nameValuePair[] = "less=more";
  43 const char name[] = "PATH";
  44 const char name2[] = "SHELL";
  45 const int MaxIterations = 1000000;
  46 const char Tabs[] = "\t\t\t";
  47
  48
  49 static int
  50 report_time(const char *action, struct timeval *startTime,
  51     struct timeval *endTime)
  52 {
  53         int actionLen;
  54         int numTabs;
  55
  56         actionLen = strlen(action);
  57         numTabs = 3 - actionLen / 8;
  58
  59         return (printf("Time spent executing %s:%.*s%f\n", action, numTabs, Tabs,
  60             (endTime->tv_sec - startTime->tv_sec) +
  61             (double)(endTime->tv_usec - startTime->tv_usec) / 1000000));
  62 }
  63
  64
  65 int
  66 main(int argc, char **argv)
  67 {
  68         int iterations;
  69         struct rusage endUsage;
  70         struct rusage startUsage;
  71
  72         /*
  73          * getenv() on the existing environment.
  74          */
  75         getrusage(RUSAGE_SELF, &startUsage);
  76
  77         /* Iterate over setting variable. */
  78         for (iterations = 0; iterations < MaxIterations; iterations++)
  79                 if (getenv(name) == NULL)
  80                         err(EXIT_FAILURE, "getenv(name)");
  81
  82         getrusage(RUSAGE_SELF, &endUsage);
  83
  84         report_time("getenv(name)", &startUsage.ru_utime, &endUsage.ru_utime);
  85
  86
  87         /*
  88          * setenv() a variable with a large value.
  89          */
  90         getrusage(RUSAGE_SELF, &startUsage);
  91
  92         /* Iterate over setting variable. */
  93         for (iterations = 0; iterations < MaxIterations; iterations++)
  94                 if (setenv(name, value1, 1) == -1)
  95                         err(EXIT_FAILURE, "setenv(name, value1, 1)");
  96
  97         getrusage(RUSAGE_SELF, &endUsage);
  98
  99         report_time("setenv(name, value1, 1)", &startUsage.ru_utime,
 100             &endUsage.ru_utime);
 101
 102
 103         /*
 104          * getenv() the new variable on the new environment.
 105          */
 106         getrusage(RUSAGE_SELF, &startUsage);
 107
 108         /* Iterate over setting variable. */
 109         for (iterations = 0; iterations < MaxIterations; iterations++)
 110                 /* Set large value to variable. */
 111                 if (getenv(name) == NULL)
 112                         err(EXIT_FAILURE, "getenv(name)");
 113
 114         getrusage(RUSAGE_SELF, &endUsage);
 115
 116         report_time("getenv(name)", &startUsage.ru_utime, &endUsage.ru_utime);
 117
 118
 119         /*
 120          * getenv() a different variable on the new environment.
 121          */
 122         getrusage(RUSAGE_SELF, &startUsage);
 123
 124         /* Iterate over setting variable. */
 125         for (iterations = 0; iterations < MaxIterations; iterations++)
 126                 /* Set large value to variable. */
 127                 if (getenv(name2) == NULL)
 128                         err(EXIT_FAILURE, "getenv(name2)");
 129
 130         getrusage(RUSAGE_SELF, &endUsage);
 131
 132         report_time("getenv(name2)", &startUsage.ru_utime, &endUsage.ru_utime);
 133
 134
 135         /*
 136          * setenv() a variable with a small value.
 137          */
 138         getrusage(RUSAGE_SELF, &startUsage);
 139
 140         /* Iterate over setting variable. */
 141         for (iterations = 0; iterations < MaxIterations; iterations++)
 142                 if (setenv(name, value2, 1) == -1)
 143                         err(EXIT_FAILURE, "setenv(name, value2, 1)");
 144
 145         getrusage(RUSAGE_SELF, &endUsage);
 146
 147         report_time("setenv(name, value2, 1)", &startUsage.ru_utime,
 148             &endUsage.ru_utime);
 149
 150
 151         /*
 152          * getenv() a different variable on the new environment.
 153          */
 154         getrusage(RUSAGE_SELF, &startUsage);
 155
 156         /* Iterate over setting variable. */
 157         for (iterations = 0; iterations < MaxIterations; iterations++)
 158                 /* Set large value to variable. */
 159                 if (getenv(name2) == NULL)
 160                         err(EXIT_FAILURE, "getenv(name)");
 161
 162         getrusage(RUSAGE_SELF, &endUsage);
 163
 164         report_time("getenv(name)", &startUsage.ru_utime, &endUsage.ru_utime);
 165
 166
 167         /*
 168          * getenv() a different variable on the new environment.
 169          */
 170         getrusage(RUSAGE_SELF, &startUsage);
 171
 172         /* Iterate over setting variable. */
 173         for (iterations = 0; iterations < MaxIterations; iterations++)
 174                 /* Set large value to variable. */
 175                 if (getenv(name2) == NULL)
 176                         err(EXIT_FAILURE, "getenv(name2)");
 177
 178         getrusage(RUSAGE_SELF, &endUsage);
 179
 180         report_time("getenv(name2)", &startUsage.ru_utime, &endUsage.ru_utime);
 181
 182
 183         /*
 184          * putenv() a variable with a small value.
 185          */
 186         getrusage(RUSAGE_SELF, &startUsage);
 187
 188         /* Iterate over setting variable. */
 189         for (iterations = 0; iterations < MaxIterations; iterations++)
 190                 if (putenv(nameValuePair) == -1)
 191                         err(EXIT_FAILURE, "putenv(nameValuePair)");
 192
 193         getrusage(RUSAGE_SELF, &endUsage);
 194
 195         report_time("putenv(nameValuePair)", &startUsage.ru_utime,
 196             &endUsage.ru_utime);
 197
 198
 199         exit(EXIT_SUCCESS);
 200 }