git.m6w6.name Git - m6w6/libmemcached/blob - src/bin/memaslap/ms_stats.c

   1 /*
   2     +--------------------------------------------------------------------+
   3     | libmemcached - C/C++ Client Library for memcached                  |
   4     +--------------------------------------------------------------------+
   5     | Redistribution and use in source and binary forms, with or without |
   6     | modification, are permitted under the terms of the BSD license.    |
   7     | You should have received a copy of the license in a bundled file   |
   8     | named LICENSE; in case you did not receive a copy you can review   |
   9     | the terms online at: https://opensource.org/licenses/BSD-3-Clause  |
  10     +--------------------------------------------------------------------+
  11     | Copyright (c) 2006-2014 Brian Aker   https://datadifferential.com/ |
  12     | Copyright (c) 2020 Michael Wallner   <mike@php.net>                |
  13     +--------------------------------------------------------------------+
  14 */
  15
  16 #include "mem_config.h"
  17
  18 #include <inttypes.h>
  19 #include "ms_stats.h"
  20
  21 #define array_size(x) (sizeof(x) / sizeof((x)[0]))
  22
  23 static int ms_local_log2(uint64_t value);
  24 static uint64_t ms_get_events(ms_stat_t *stat);
  25
  26 /**
  27  * get the index of local log2 array
  28  *
  29  * @param value
  30  *
  31  * @return return the index of local log2 array
  32  */
  33 static int ms_local_log2(uint64_t value) {
  34   int result = 0;
  35
  36   while (result <= 63 && ((uint64_t) 1 << result) < value) {
  37     result++;
  38   }
  39
  40   return result;
  41 } /* ms_local_log2 */
  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   memset(stat, 0, sizeof(*stat));
  51
  52   stat->name = (char *) name;
  53   stat->min_time = (uint64_t) -1;
  54   stat->max_time = 0;
  55   stat->period_min_time = (uint64_t) -1;
  56   stat->period_max_time = 0;
  57   stat->log_product = 0;
  58   stat->total_time = 0;
  59   stat->pre_total_time = 0;
  60   stat->squares = 0;
  61   stat->pre_squares = 0;
  62   stat->pre_events = 0;
  63   stat->pre_log_product = 0;
  64   stat->get_miss = 0;
  65   stat->pre_get_miss = 0;
  66 } /* ms_init_stats */
  67
  68 /**
  69  * record one event
  70  *
  71  * @param stat, pointer of the statistic structure
  72  * @param total_time, response time of the command
  73  * @param get_miss, whether it gets miss
  74  */
  75 void ms_record_event(ms_stat_t *stat, uint64_t total_time, int get_miss) {
  76   stat->total_time += total_time;
  77
  78   if (total_time < stat->min_time) {
  79     stat->min_time = total_time;
  80   }
  81
  82   if (total_time > stat->max_time) {
  83     stat->max_time = total_time;
  84   }
  85
  86   if (total_time < stat->period_min_time) {
  87     stat->period_min_time = total_time;
  88   }
  89
  90   if (total_time > stat->period_max_time) {
  91     stat->period_max_time = total_time;
  92   }
  93
  94   if (get_miss) {
  95     stat->get_miss++;
  96   }
  97
  98   stat->dist[ms_local_log2(total_time)]++;
  99   stat->squares += (double) (total_time * total_time);
 100
 101   if (total_time) {
 102     stat->log_product += log((double) total_time);
 103   }
 104 } /* ms_record_event */
 105
 106 /**
 107  * get the events count
 108  *
 109  * @param stat, pointer of the statistic structure
 110  *
 111  * @return total events recorded
 112  */
 113 static uint64_t ms_get_events(ms_stat_t *stat) {
 114   uint64_t events = 0;
 115
 116   for (uint32_t i = 0; i < array_size(stat->dist); i++) {
 117     events += stat->dist[i];
 118   }
 119
 120   return events;
 121 } /* ms_get_events */
 122
 123 /**
 124  * dump the statistics
 125  *
 126  * @param stat, pointer of the statistic structure
 127  */
 128 void ms_dump_stats(ms_stat_t *stat) {
 129   uint64_t events = 0;
 130   int max_non_zero = 0;
 131   int min_non_zero = 0;
 132   double average = 0;
 133
 134   for (uint32_t i = 0; i < array_size(stat->dist); i++) {
 135     events += stat->dist[i];
 136     if (stat->dist[i]) {
 137       max_non_zero = (int) i;
 138     }
 139   }
 140
 141   if (events == 0) {
 142     return;
 143   }
 144   average = (double) (stat->total_time / events);
 145
 146   printf("%s Statistics (%lld events)\n", stat->name, (long long) events);
 147   printf("   Min:  %8lld\n", (long long) stat->min_time);
 148   printf("   Max:  %8lld\n", (long long) stat->max_time);
 149   printf("   Avg:  %8lld\n", (long long) (stat->total_time / events));
 150   printf("   Geo:  %8.2lf\n", exp(stat->log_product / (double) events));
 151
 152   if (events > 1) {
 153     printf("   Std:  %8.2lf\n",
 154            sqrt((stat->squares - (double) events * average * average) / ((double) events - 1)));
 155   }
 156   printf("   Log2 Dist:");
 157
 158   for (int i = 0; i <= max_non_zero - 4; i += 4) {
 159     if ((stat->dist[i + 0]) || (stat->dist[i + 1]) || (stat->dist[i + 2])
 160         || (stat->dist[i + 3]))
 161     {
 162       min_non_zero = i;
 163       break;
 164     }
 165   }
 166
 167   for (int i = min_non_zero; i <= max_non_zero; i++) {
 168     if ((i % 4) == 0) {
 169       printf("\n      %2d:", (int) i);
 170     }
 171     printf("   %6" PRIu64, stat->dist[i]);
 172   }
 173
 174   printf("\n\n");
 175 } /* ms_dump_stats */
 176
 177 /**
 178  * dump the format statistics
 179  *
 180  * @param stat, pointer of the statistic structure
 181  * @param run_time, the total run time
 182  * @param freq, statistic frequency
 183  * @param obj_size, average object size
 184  */
 185 void ms_dump_format_stats(ms_stat_t *stat, int run_time, int freq, int obj_size) {
 186   uint64_t events = 0;
 187   double global_average = 0;
 188   uint64_t global_tps = 0;
 189   double global_rate = 0;
 190   double global_std = 0;
 191   double global_log = 0;
 192
 193   double period_average = 0;
 194   uint64_t period_tps = 0;
 195   double period_rate = 0;
 196   double period_std = 0;
 197   double period_log = 0;
 198
 199   if ((events = ms_get_events(stat)) == 0) {
 200     return;
 201   }
 202
 203   global_average = (double) (stat->total_time / events);
 204   global_tps = events / (uint64_t) run_time;
 205   global_rate = (double) events * obj_size / 1024 / 1024 / run_time;
 206   global_std = sqrt((stat->squares - (double) events * global_average * global_average)
 207                     / (double) (events - 1));
 208   global_log = exp(stat->log_product / (double) events);
 209
 210   uint64_t diff_time = stat->total_time - stat->pre_total_time;
 211   uint64_t diff_events = events - stat->pre_events;
 212   if (diff_events >= 1) {
 213     period_average = (double) (diff_time / diff_events);
 214     period_tps = diff_events / (uint64_t) freq;
 215     period_rate = (double) diff_events * obj_size / 1024 / 1024 / freq;
 216     double diff_squares = (double) stat->squares - (double) stat->pre_squares;
 217     period_std = sqrt((diff_squares - (double) diff_events * period_average * period_average)
 218                       / (double) (diff_events - 1));
 219     double diff_log_product = stat->log_product - stat->pre_log_product;
 220     period_log = exp(diff_log_product / (double) diff_events);
 221   }
 222
 223   printf("%s Statistics\n", stat->name);
 224   printf("%-8s %-8s %-12s %-12s %-10s %-10s %-8s %-10s %-10s %-10s %-10s\n", "Type", "Time(s)",
 225          "Ops", "TPS(ops/s)", "Net(M/s)", "Get_miss", "Min(us)", "Max(us)", "Avg(us)", "Std_dev",
 226          "Geo_dist");
 227
 228   printf("%-8s %-8d %-12llu %-12lld %-10.1f %-10lld %-8lld %-10lld %-10lld %-10.2f %.2f\n",
 229          "Period", freq, (long long) diff_events, (long long) period_tps, global_rate,
 230          (long long) (stat->get_miss - stat->pre_get_miss), (long long) stat->period_min_time,
 231          (long long) stat->period_max_time, (long long) period_average, period_std, period_log);
 232
 233   printf("%-8s %-8d %-12llu %-12lld %-10.1f %-10lld %-8lld %-10lld %-10lld %-10.2f %.2f\n\n",
 234          "Global", run_time, (long long) events, (long long) global_tps, period_rate,
 235          (long long) stat->get_miss, (long long) stat->min_time, (long long) stat->max_time,
 236          (long long) global_average, global_std, global_log);
 237
 238   stat->pre_events = events;
 239   stat->pre_squares = (uint64_t) stat->squares;
 240   stat->pre_total_time = stat->total_time;
 241   stat->pre_log_product = stat->log_product;
 242   stat->period_min_time = (uint64_t) -1;
 243   stat->period_max_time = 0;
 244   stat->pre_get_miss = stat->get_miss;
 245 } /* ms_dump_format_stats */