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annotate third_party/wrk/src/stats.c @ 205:e07b4b5a66bb

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author MrJuneJune <me@mrjunejune.com>
date Sun, 15 Feb 2026 11:07:52 -0800
parents 94705b5986b3
children
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178
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
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1 // Copyright (C) 2012 - Will Glozer. All rights reserved.
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2
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3 #include <inttypes.h>
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4 #include <stdlib.h>
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5 #include <math.h>
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6
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7 #include "stats.h"
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8 #include "zmalloc.h"
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9
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10 stats *stats_alloc(uint64_t max) {
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11 uint64_t limit = max + 1;
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12 stats *s = zcalloc(sizeof(stats) + sizeof(uint64_t) * limit);
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13 s->limit = limit;
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14 s->min = UINT64_MAX;
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15 return s;
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16 }
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17
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18 void stats_free(stats *stats) {
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19 zfree(stats);
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20 }
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21
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22 int stats_record(stats *stats, uint64_t n) {
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23 if (n >= stats->limit) return 0;
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24 __sync_fetch_and_add(&stats->data[n], 1);
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25 __sync_fetch_and_add(&stats->count, 1);
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26 uint64_t min = stats->min;
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27 uint64_t max = stats->max;
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28 while (n < min) min = __sync_val_compare_and_swap(&stats->min, min, n);
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29 while (n > max) max = __sync_val_compare_and_swap(&stats->max, max, n);
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30 return 1;
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31 }
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32
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33 void stats_correct(stats *stats, int64_t expected) {
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34 for (uint64_t n = expected * 2; n <= stats->max; n++) {
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35 uint64_t count = stats->data[n];
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36 int64_t m = (int64_t) n - expected;
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37 while (count && m > expected) {
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38 stats->data[m] += count;
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39 stats->count += count;
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40 m -= expected;
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41 }
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42 }
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43 }
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44
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45 long double stats_mean(stats *stats) {
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46 if (stats->count == 0) return 0.0;
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47
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48 uint64_t sum = 0;
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49 for (uint64_t i = stats->min; i <= stats->max; i++) {
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50 sum += stats->data[i] * i;
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51 }
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52 return sum / (long double) stats->count;
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53 }
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54
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55 long double stats_stdev(stats *stats, long double mean) {
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56 long double sum = 0.0;
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57 if (stats->count < 2) return 0.0;
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58 for (uint64_t i = stats->min; i <= stats->max; i++) {
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59 if (stats->data[i]) {
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60 sum += powl(i - mean, 2) * stats->data[i];
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61 }
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62 }
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63 return sqrtl(sum / (stats->count - 1));
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64 }
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65
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66 long double stats_within_stdev(stats *stats, long double mean, long double stdev, uint64_t n) {
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67 long double upper = mean + (stdev * n);
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68 long double lower = mean - (stdev * n);
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69 uint64_t sum = 0;
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70
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71 for (uint64_t i = stats->min; i <= stats->max; i++) {
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72 if (i >= lower && i <= upper) {
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73 sum += stats->data[i];
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74 }
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75 }
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76
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77 return (sum / (long double) stats->count) * 100;
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78 }
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79
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80 uint64_t stats_percentile(stats *stats, long double p) {
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81 uint64_t rank = round((p / 100.0) * stats->count + 0.5);
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82 uint64_t total = 0;
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83 for (uint64_t i = stats->min; i <= stats->max; i++) {
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84 total += stats->data[i];
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85 if (total >= rank) return i;
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86 }
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87 return 0;
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88 }
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89
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90 uint64_t stats_popcount(stats *stats) {
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91 uint64_t count = 0;
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92 for (uint64_t i = stats->min; i <= stats->max; i++) {
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93 if (stats->data[i]) count++;
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94 }
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95 return count;
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96 }
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97
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98 uint64_t stats_value_at(stats *stats, uint64_t index, uint64_t *count) {
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99 *count = 0;
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100 for (uint64_t i = stats->min; i <= stats->max; i++) {
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101 if (stats->data[i] && (*count)++ == index) {
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102 *count = stats->data[i];
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103 return i;
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104 }
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105 }
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106 return 0;
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107 }