prosody
d75d805c852f
util/statistics.lua

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util/statistics.lua @ 10883:d75d805c852f

util.statistics: Unify API of methods to include a config table The primary goal here is to allow specifying an unit that each statistic is measured in.
author Kim Alvefur <zash@zash.se>
date Fri, 04 Jan 2019 06:56:45 +0100
parent 10314:bbc879eab1bf
child 11523:5f15ab7c6ae5
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rev   line source
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1 local t_sort = table.sort
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2 local m_floor = math.floor;
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3 local time = require "util.time".now;
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4
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5 local function nop_function() end
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6
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7 local function percentile(arr, length, pc)
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8 local n = pc/100 * (length + 1);
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9 local k, d = m_floor(n), n%1;
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10 if k == 0 then
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11 return arr[1] or 0;
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12 elseif k >= length then
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13 return arr[length];
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14 end
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15 return arr[k] + d*(arr[k+1] - arr[k]);
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16 end
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17
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18 local function new_registry(config)
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19 config = config or {};
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20 local duration_sample_interval = config.duration_sample_interval or 5;
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21 local duration_max_samples = config.duration_max_stored_samples or 5000;
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22
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23 local function get_distribution_stats(events, n_actual_events, since, new_time, units)
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24 local n_stored_events = #events;
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25 t_sort(events);
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26 local sum = 0;
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27 for i = 1, n_stored_events do
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28 sum = sum + events[i];
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29 end
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30
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31 return {
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32 samples = events;
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33 sample_count = n_stored_events;
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34 count = n_actual_events,
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35 rate = n_actual_events/(new_time-since);
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36 average = n_stored_events > 0 and sum/n_stored_events or 0,
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37 min = events[1] or 0,
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38 max = events[n_stored_events] or 0,
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39 units = units,
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40 };
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41 end
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42
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43
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44 local registry = {};
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45 local methods;
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46 methods = {
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47 amount = function (name, conf)
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48 local v = conf and conf.initial or 0;
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49 registry[name..":amount"] = function ()
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50 return "amount", v, conf;
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51 end
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52 return function (new_v) v = new_v; end
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53 end;
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54 counter = function (name, conf)
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55 local v = conf and conf.initial or 0;
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56 registry[name..":amount"] = function ()
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57 return "amount", v, conf;
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58 end
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59 return function (delta)
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60 v = v + delta;
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61 end;
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62 end;
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63 rate = function (name, conf)
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64 local since, n, total = time(), 0, 0;
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65 registry[name..":rate"] = function ()
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66 total = total + n;
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67 local t = time();
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68 local stats = {
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69 rate = n/(t-since);
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70 count = n;
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71 total = total;
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72 units = conf and conf.units;
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73 type = conf and conf.type;
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74 };
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75 since, n = t, 0;
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76 return "rate", stats.rate, stats;
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77 end;
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78 return function ()
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79 n = n + 1;
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80 end;
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81 end;
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82 distribution = function (name, conf)
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83 local units = conf and conf.units;
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84 local type = conf and conf.type or "distribution";
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85 local events, last_event = {}, 0;
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86 local n_actual_events = 0;
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87 local since = time();
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88
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89 registry[name..":"..type] = function ()
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90 local new_time = time();
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91 local stats = get_distribution_stats(events, n_actual_events, since, new_time, units);
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92 events, last_event = {}, 0;
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93 n_actual_events = 0;
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94 since = new_time;
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95 return type, stats.average, stats;
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96 end;
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97
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98 return function (value)
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99 n_actual_events = n_actual_events + 1;
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100 if n_actual_events%duration_sample_interval == 1 then
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101 last_event = (last_event%duration_max_samples) + 1;
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102 events[last_event] = value;
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103 end
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104 end;
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105 end;
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106 sizes = function (name, conf)
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107 conf = conf or { units = "bytes", type = "size" }
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108 return methods.distribution(name, conf);
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109 end;
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110 times = function (name, conf)
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111 local units = conf and conf.units or "seconds";
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112 local events, last_event = {}, 0;
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113 local n_actual_events = 0;
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114 local since = time();
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115
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116 registry[name..":duration"] = function ()
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117 local new_time = time();
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118 local stats = get_distribution_stats(events, n_actual_events, since, new_time, units);
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119 events, last_event = {}, 0;
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120 n_actual_events = 0;
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121 since = new_time;
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122 return "duration", stats.average, stats;
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123 end;
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124
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125 return function ()
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126 n_actual_events = n_actual_events + 1;
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127 if n_actual_events%duration_sample_interval ~= 1 then
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128 return nop_function;
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129 end
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130
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131 local start_time = time();
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132 return function ()
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133 local end_time = time();
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134 local duration = end_time - start_time;
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135 last_event = (last_event%duration_max_samples) + 1;
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136 events[last_event] = duration;
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137 end
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138 end;
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139 end;
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140
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141 get_stats = function ()
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142 return registry;
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143 end;
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144 };
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145 return methods;
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146 end
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147
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148 return {
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149 new = new_registry;
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150 get_histogram = function (duration, n_buckets)
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151 n_buckets = n_buckets or 100;
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152 local events, n_events = duration.samples, duration.sample_count;
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153 if not (events and n_events) then
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154 return nil, "not a valid distribution stat";
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155 end
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156 local histogram = {};
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157
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158 for i = 1, 100, 100/n_buckets do
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159 histogram[i] = percentile(events, n_events, i);
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160 end
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161 return histogram;
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162 end;
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163
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164 get_percentile = function (duration, pc)
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165 local events, n_events = duration.samples, duration.sample_count;
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166 if not (events and n_events) then
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167 return nil, "not a valid distribution stat";
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168 end
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169 return percentile(events, n_events, pc);
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170 end;
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171 }