git.m6w6.name Git - awesomized/libmemcached/blob - clients/ms_stats.c

   1 /*
   2  * File:   ms_stats.h
   3  * Author: Mingqiang Zhuang
   4  *
   5  * Created on March 25, 2009
   6  *
   7  * (c) Copyright 2009, Schooner Information Technology, Inc.
   8  * http://www.schoonerinfotech.com/
   9  *
  10  */
  11
  12 #include "mem_config.h"
  13
  14 #include <inttypes.h>
  15 #include "ms_stats.h"
  16
  17 #define array_size(x)    (sizeof(x) / sizeof((x)[0]))
  18
  19 static int ms_local_log2(uint64_t value);
  20 static uint64_t ms_get_events(ms_stat_t *stat);
  21
  22
  23 /**
  24  * get the index of local log2 array
  25  *
  26  * @param value
  27  *
  28  * @return return the index of local log2 array
  29  */
  30 static int ms_local_log2(uint64_t value)
  31 {
  32   int result= 0;
  33
  34   while (result <= 63 && ((uint64_t)1 << result) < value)
  35   {
  36     result++;
  37   }
  38
  39   return result;
  40 } /* ms_local_log2 */
  41
  42
  43 /**
  44  * initialize statistic structure
  45  *
  46  * @param stat, pointer of the statistic structure
  47  * @param name, name of the statistic
  48  */
  49 void ms_init_stats(ms_stat_t *stat, const char *name)
  50 {
  51   memset(stat, 0, sizeof(*stat));
  52
  53   stat->name= (char *)name;
  54   stat->min_time= (uint64_t)-1;
  55   stat->max_time= 0;
  56   stat->period_min_time= (uint64_t)-1;
  57   stat->period_max_time= 0;
  58   stat->log_product= 0;
  59   stat->total_time= 0;
  60   stat->pre_total_time= 0;
  61   stat->squares= 0;
  62   stat->pre_squares= 0;
  63   stat->pre_events= 0;
  64   stat->pre_log_product= 0;
  65   stat->get_miss= 0;
  66   stat->pre_get_miss= 0;
  67 } /* ms_init_stats */
  68
  69
  70 /**
  71  * record one event
  72  *
  73  * @param stat, pointer of the statistic structure
  74  * @param total_time, response time of the command
  75  * @param get_miss, whether it gets miss
  76  */
  77 void ms_record_event(ms_stat_t *stat, uint64_t total_time, int get_miss)
  78 {
  79   stat->total_time+= total_time;
  80
  81   if (total_time < stat->min_time)
  82   {
  83     stat->min_time= total_time;
  84   }
  85
  86   if (total_time > stat->max_time)
  87   {
  88     stat->max_time= total_time;
  89   }
  90
  91   if (total_time < stat->period_min_time)
  92   {
  93     stat->period_min_time= total_time;
  94   }
  95
  96   if (total_time > stat->period_max_time)
  97   {
  98     stat->period_max_time= total_time;
  99   }
 100
 101   if (get_miss)
 102   {
 103     stat->get_miss++;
 104   }
 105
 106   stat->dist[ms_local_log2(total_time)]++;
 107   stat->squares+= (double)(total_time * total_time);
 108
 109   if (total_time != 0)
 110   {
 111     stat->log_product+= log((double)total_time);
 112   }
 113 } /* ms_record_event */
 114
 115
 116 /**
 117  * get the events count
 118  *
 119  * @param stat, pointer of the statistic structure
 120  *
 121  * @return total events recorded
 122  */
 123 static uint64_t ms_get_events(ms_stat_t *stat)
 124 {
 125   uint64_t events= 0;
 126
 127   for (uint32_t i= 0; i < array_size(stat->dist); i++)
 128   {
 129     events+= stat->dist[i];
 130   }
 131
 132   return events;
 133 } /* ms_get_events */
 134
 135
 136 /**
 137  * dump the statistics
 138  *
 139  * @param stat, pointer of the statistic structure
 140  */
 141 void ms_dump_stats(ms_stat_t *stat)
 142 {
 143   uint64_t events= 0;
 144   int max_non_zero= 0;
 145   int min_non_zero= 0;
 146   double average= 0;
 147
 148   for (uint32_t i= 0; i < array_size(stat->dist); i++)
 149   {
 150     events+= stat->dist[i];
 151     if (stat->dist[i] != 0)
 152     {
 153       max_non_zero= (int)i;
 154     }
 155   }
 156
 157   if (events == 0)
 158   {
 159     return;
 160   }
 161   average= (double)(stat->total_time / events);
 162
 163   printf("%s Statistics (%lld events)\n", stat->name, (long long)events);
 164   printf("   Min:  %8lld\n", (long long)stat->min_time);
 165   printf("   Max:  %8lld\n", (long long)stat->max_time);
 166   printf("   Avg:  %8lld\n", (long long)(stat->total_time / events));
 167   printf("   Geo:  %8.2lf\n", exp(stat->log_product / (double)events));
 168
 169   if (events > 1)
 170   {
 171     printf("   Std:  %8.2lf\n",
 172            sqrt((stat->squares - (double)events * average
 173                  * average) / ((double)events - 1)));
 174   }
 175   printf("   Log2 Dist:");
 176
 177   for (int i= 0; i <= max_non_zero - 4; i+= 4)
 178   {
 179     if ((stat->dist[i + 0] != 0)
 180         || (stat->dist[i + 1] != 0)
 181         || (stat->dist[i + 2] != 0)
 182         || (stat->dist[i + 3] != 0))
 183     {
 184       min_non_zero= i;
 185       break;
 186     }
 187   }
 188
 189   for (int i= min_non_zero; i <= max_non_zero; i++)
 190   {
 191     if ((i % 4) == 0)
 192     {
 193       printf("\n      %2d:", (int)i);
 194     }
 195     printf("   %6" PRIu64 , stat->dist[i]);
 196   }
 197
 198   printf("\n\n");
 199 } /* ms_dump_stats */
 200
 201
 202 /**
 203  * dump the format statistics
 204  *
 205  * @param stat, pointer of the statistic structure
 206  * @param run_time, the total run time
 207  * @param freq, statistic frequency
 208  * @param obj_size, average object size
 209  */
 210 void ms_dump_format_stats(ms_stat_t *stat,
 211                           int run_time,
 212                           int freq,
 213                           int obj_size)
 214 {
 215   uint64_t events= 0;
 216   double global_average= 0;
 217   uint64_t global_tps= 0;
 218   double global_rate= 0;
 219   double global_std= 0;
 220   double global_log= 0;
 221
 222   double period_average= 0;
 223   uint64_t period_tps= 0;
 224   double period_rate= 0;
 225   double period_std= 0;
 226   double period_log= 0;
 227
 228   if ((events= ms_get_events(stat)) == 0)
 229   {
 230     return;
 231   }
 232
 233   global_average= (double)(stat->total_time / events);
 234   global_tps= events / (uint64_t)run_time;
 235   global_rate= (double)events * obj_size / 1024 / 1024 / run_time;
 236   global_std= sqrt((stat->squares - (double)events * global_average
 237                     * global_average) / (double)(events - 1));
 238   global_log= exp(stat->log_product / (double)events);
 239
 240   uint64_t diff_time= stat->total_time - stat->pre_total_time;
 241   uint64_t diff_events= events - stat->pre_events;
 242   if (diff_events >= 1)
 243   {
 244     period_average= (double)(diff_time / diff_events);
 245     period_tps= diff_events / (uint64_t)freq;
 246     period_rate= (double)diff_events * obj_size / 1024 / 1024 / freq;
 247     double diff_squares= (double)stat->squares - (double)stat->pre_squares;
 248     period_std= sqrt((diff_squares - (double)diff_events * period_average
 249                       * period_average) / (double)(diff_events - 1));
 250     double diff_log_product= stat->log_product - stat->pre_log_product;
 251     period_log= exp(diff_log_product / (double)diff_events);
 252   }
 253
 254   printf("%s Statistics\n", stat->name);
 255   printf("%-8s %-8s %-12s %-12s %-10s %-10s %-8s %-10s %-10s %-10s %-10s\n",
 256          "Type",
 257          "Time(s)",
 258          "Ops",
 259          "TPS(ops/s)",
 260          "Net(M/s)",
 261          "Get_miss",
 262          "Min(us)",
 263          "Max(us)",
 264          "Avg(us)",
 265          "Std_dev",
 266          "Geo_dist");
 267
 268   printf(
 269     "%-8s %-8d %-12llu %-12lld %-10.1f %-10lld %-8lld %-10lld %-10lld %-10.2f %.2f\n",
 270     "Period",
 271     freq,
 272     (long long)diff_events,
 273     (long long)period_tps,
 274     global_rate,
 275     (long long)(stat->get_miss - stat->pre_get_miss),
 276     (long long)stat->period_min_time,
 277     (long long)stat->period_max_time,
 278     (long long)period_average,
 279     period_std,
 280     period_log);
 281
 282   printf(
 283     "%-8s %-8d %-12llu %-12lld %-10.1f %-10lld %-8lld %-10lld %-10lld %-10.2f %.2f\n\n",
 284     "Global",
 285     run_time,
 286     (long long)events,
 287     (long long)global_tps,
 288     period_rate,
 289     (long long)stat->get_miss,
 290     (long long)stat->min_time,
 291     (long long)stat->max_time,
 292     (long long)global_average,
 293     global_std,
 294     global_log);
 295
 296   stat->pre_events= events;
 297   stat->pre_squares= (uint64_t)stat->squares;
 298   stat->pre_total_time= stat->total_time;
 299   stat->pre_log_product= stat->log_product;
 300   stat->period_min_time= (uint64_t)-1;
 301   stat->period_max_time= 0;
 302   stat->pre_get_miss= stat->get_miss;
 303 } /* ms_dump_format_stats */