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annotate third_party/wrk/src/stats.c @ 279:b3b547563ec7

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Add Google connector service and agent wiki Implement the C/Seobeo Google Drive and Gmail connector with encrypted OAuth storage, Zenbu authentication, browser testing, AI tool discovery, chunked HTTP decoding, and Bazel coverage. Consolidate repository guidance into progressive wiki documentation and enforce arena-first allocation for new first-party C code. Co-authored-by: Copilot <[email protected]> Copilot-Session: 84c338fd-0939-4bb3-b7f3-1062eb213e5d
author MrJuneJune <me@mrjunejune.com>
date Mon, 17 Aug 2026 22:22:36 -0700
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 }