nsprpub/pr/tests/time.c

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  15  * The Original Code is the Netscape Portable Runtime (NSPR).
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  37
  38 /*
  39  * Program to test different ways to get the time; right now it is tuned
  40  * only for solaris.
  41  *   solaris results (100000 iterations):
  42  *          time to get time with time():   4.63 usec avg, 463 msec total
  43  *     time to get time with gethrtime():   2.17 usec avg, 217 msec total
  44  *  time to get time with gettimeofday():   1.25 usec avg, 125 msec total
  45  *
  46  *
  47  */
  48 /***********************************************************************
  49 ** Includes
  50 ***********************************************************************/
  51 /* Used to get the command line option */
  52 #include "plgetopt.h"
  53
  54 #include "nspr.h"
  55 #include "prpriv.h"
  56 #include "prinrval.h"
  57
  58 #include <stdio.h>
  59 #include <stdlib.h>
  60 #include <string.h>
  61 #include <sys/time.h>
  62
  63 #define DEFAULT_COUNT 100000
  64 PRInt32 count;
  65
  66 time_t itime;
  67 hrtime_t ihrtime;
  68
  69 void
  70 ftime_init()
  71 {
  72    itime = time(NULL);
  73    ihrtime = gethrtime();
  74 }
  75
  76 time_t
  77 ftime()
  78 {
  79         hrtime_t now = gethrtime();
  80
  81         return itime + ((now - ihrtime) / 1000000000ll);
  82 }
  83
  84 static void timeTime(void)
  85 {
  86     PRInt32 index = count;
  87     time_t rv;
  88
  89     for (;index--;)
  90         rv = time(NULL);
  91 }
  92
  93 static void timeGethrtime(void)
  94 {
  95     PRInt32 index = count;
  96     time_t rv;
  97
  98     for (;index--;)
  99         rv = ftime();
 100 }
 101
 102 static void timeGettimeofday(void)
 103 {
 104     PRInt32 index = count;
 105     time_t rv;
 106     struct timeval tp;
 107
 108     for (;index--;)
 109         rv = gettimeofday(&tp, NULL);
 110 }
 111
 112 static void timePRTime32(void)
 113 {
 114     PRInt32 index = count;
 115     PRInt32 rv32;
 116     PRTime q;
 117     PRTime rv;
 118
 119     LL_I2L(q, 1000000);
 120
 121     for (;index--;) {
 122         rv = PR_Now();
 123         LL_DIV(rv, rv, q);
 124         LL_L2I(rv32, rv);
 125     }
 126 }
 127
 128 static void timePRTime64(void)
 129 {
 130     PRInt32 index = count;
 131     PRTime rv;
 132
 133     for (;index--;)
 134         rv = PR_Now();
 135 }
 136
 137 /************************************************************************/
 138
 139 static void Measure(void (*func)(void), const char *msg)
 140 {
 141     PRIntervalTime start, stop;
 142     double d;
 143     PRInt32 tot;
 144
 145     start = PR_IntervalNow();
 146     (*func)();
 147     stop = PR_IntervalNow();
 148
 149     d = (double)PR_IntervalToMicroseconds(stop - start);
 150     tot = PR_IntervalToMilliseconds(stop-start);
 151
 152     if (debug_mode) printf("%40s: %6.2f usec avg, %d msec total\n", msg, d / count, tot);
 153 }
 154
 155 void main(int argc, char **argv)
 156 {
 157         /* The command line argument: -d is used to determine if the test is being run
 158         in debug mode. The regress tool requires only one line output:PASS or FAIL.
 159         All of the printfs associated with this test has been handled with a if (debug_mode)
 160         test.
 161         Usage: test_name -d
 162         */
 163         PLOptStatus os;
 164         PLOptState *opt = PL_CreateOptState(argc, argv, "d:");
 165         while (PL_OPT_EOL != (os = PL_GetNextOpt(opt)))
 166     {
 167                 if (PL_OPT_BAD == os) continue;
 168         switch (opt->option)
 169         {
 170         case 'd':  /* debug mode */
 171                         debug_mode = 1;
 172             break;
 173          default:
 174             break;
 175         }
 176     }
 177         PL_DestroyOptState(opt);
 178
 179     PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0);
 180     PR_STDIO_INIT();
 181
 182     if (argc > 1) {
 183         count = atoi(argv[1]);
 184     } else {
 185         count = DEFAULT_COUNT;
 186     }
 187
 188     ftime_init();
 189
 190     Measure(timeTime, "time to get time with time()");
 191     Measure(timeGethrtime, "time to get time with gethrtime()");
 192     Measure(timeGettimeofday, "time to get time with gettimeofday()");
 193     Measure(timePRTime32, "time to get time with PR_Time() (32bit)");
 194     Measure(timePRTime64, "time to get time with PR_Time() (64bit)");
 195
 196         PR_Cleanup();
 197         return 0;
 198 }
 199
 200
 201