lib/str-test.c

   1 /*
   2  *      Checking the correctness of str_len() and hash_*() and proving, that
   3  *      it is faster than the classical version ;-)
   4  */
   5
   6 #include "lib/hashfunc.h"
   7
   8 #include <stdlib.h>
   9 #include <stdio.h>
  10 #include <string.h>
  11 #include <sys/time.h>
  12
  13 /* It will be divided by (10 + strlen()).  */
  14 #define TEST_TIME       1000000
  15
  16 /* The shift of the string according to the alignment.  */
  17 static uns alignment = 0;
  18
  19 static void
  20 random_string(byte *str, int len)
  21 {
  22         int i;
  23         for (i=0; i<len; i++)
  24                 str[i] = random() % 255 + 1;
  25         str[len] = 0;
  26 }
  27
  28 static uns
  29 elapsed_time(void)
  30 {
  31         static struct timeval last_tv, tv;
  32         uns elapsed;
  33         gettimeofday(&tv, NULL);
  34         elapsed = (tv.tv_sec - last_tv.tv_sec) * 1000000 + (tv.tv_usec - last_tv.tv_usec);
  35         last_tv = tv;
  36         return elapsed;
  37 }
  38
  39 int
  40 main(int argc, char **argv)
  41 {
  42         byte *strings[] = {
  43                 "",
  44                 "a",
  45                 "aa",
  46                 "aaa",
  47                 "aaaa",
  48                 "aaaaa",
  49                 "aaaaaa",
  50                 "aaaaaaa",
  51                 "aaaaaaaa",
  52                 "aaaaaaaaa",
  53                 "aaaaaaaaaa",
  54                 "AHOJ",
  55                 "\200aaaa",
  56                 "\200",
  57                 "\200\200",
  58                 "\200\200\200",
  59                 "\200\200\200\200",
  60                 "\200\200\200\200\200",
  61                 "kelapS treboR",
  62                 "Robert Spalek",
  63                 "uuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu",
  64                 "********************************",
  65                 "****************************************************************",
  66                 NULL
  67         };
  68         int lengths[] = {
  69                 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10,
  70                 11, 12, 13, 14, 15, 16, 17, 18, 19, 20,
  71                 30, 40, 50, 60, 70, 80, 90, 100,
  72                 200, 300, 400, 500, 600, 700, 800, 900, 1000,
  73                 2000, 4000, 8000, 16000, 32000, 64000,
  74                 -1
  75         };
  76         int i;
  77         if (argc > 1)
  78                 alignment = atoi(argv[1]);
  79         printf("Alignment set to %d\n", alignment);
  80         for (i=0; strings[i]; i++)
  81                 if (strlen(strings[i]) != str_len(strings[i]))
  82                         die("Internal str_len() error on string %d", i);
  83         printf("%d strings tested OK\n", i);
  84         for (i=0; strings[i]; i++)
  85         {
  86                 uns h1, h2;
  87                 h1 = hash_string(strings[i]);
  88                 h2 = hash_string_nocase(strings[i]);
  89                 if (h1 != hash_block(strings[i], str_len(strings[i])))
  90                         die("Internal hash_string() error on string %d", i);
  91                 printf("hash %2d = %08x %08x", i, h1, h2);
  92                 if (h1 == h2)
  93                         printf(" upper case?");
  94                 printf("\n");
  95         }
  96         for (i=0; lengths[i] >= 0; i++)
  97         {
  98                 byte str[lengths[i] + 1 + alignment];
  99                 uns count = TEST_TIME / (lengths[i] + 10);
 100                 uns el1 = 0, el2 = 0, elh = 0, elhn = 0;
 101                 uns tot1 = 0, tot2 = 0, hash = 0, hashn = 0;
 102                 uns j;
 103                 for (j=0; j<count; j++)
 104                 {
 105                         random_string(str + alignment, lengths[i]);
 106                         elapsed_time();
 107                         /* Avoid "optimizing" by gcc, since the functions are
 108                          * attributed PURE.  */
 109                         tot1 += strlen(str + alignment);
 110                         el1 += elapsed_time();
 111                         tot2 += str_len(str + alignment);
 112                         el2 += elapsed_time();
 113                         hash ^= hash_string(str + alignment);
 114                         elh += elapsed_time();
 115                         hashn ^= hash_string_nocase(str + alignment);
 116                         elhn += elapsed_time();
 117                 }
 118                 if (tot1 != tot2)
 119                         die("Internal error during test %d", i);
 120                 printf("Test %d: strlen = %d, passes = %d, classical = %d usec, speedup = %.4f\n",
 121                         i, lengths[i], count, el1, (el1 + 0.) / el2);
 122                 printf("\t\t total hash = %08x/%08x, hash time = %d/%d usec\n", hash, hashn, elh, elhn);
 123         }
 124 /*
 125         printf("test1: %d\n", hash_modify(10000000, 10000000, 99777555));
 126         printf("test1: %d, %d\n", i, hash_modify(i, lengths[i-2], 99777333));
 127         printf("test1: %d, %d\n", i, hash_modify(lengths[i-2], i, 99777333));
 128         printf("test1: %d,%d,%d->%d\n", i, i*3-2, i*i, hash_modify(4587, i*3-2, i*i));
 129         printf("test1: %d\n", hash_modify(lengths[5], 345, i));
 130 */
 131         return 0;
 132 }