Created
October 10, 2018 12:53
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const history = Array(1500); | |
let history_total = 0; | |
const MDELAY_MS = 1; | |
let counter = 0; | |
function measure() { | |
setTimeout((start) => { | |
const diff = process.hrtime(start); | |
const lag = Math.max(0, diff[0] * 1e3 + diff[1] / 1e6 - MDELAY_MS); | |
const index = counter++ % history.length; | |
history[index] = lag; | |
history_total += lag; | |
}, MDELAY_MS, process.hrtime()); | |
} | |
let timeout = (function test() { | |
setTimeout(() => { | |
measure(); | |
timeout = test(); | |
}, 150 + Math.random() * 100); | |
})(); | |
module.exports = function lagstats() { | |
const sorted = history.filter(v => typeof v != 'undefined').sort(); | |
const N = sorted.length; | |
const sum = sorted.reduce((s, v) => s + v, 0); | |
const mean = sum / N; | |
const sd = Math.sqrt(sorted.reduce((s, v) => s + Math.pow(v - mean, 2), 0) / N); | |
const perc = { | |
50: sorted[Math.floor(N * .50) - 1], | |
90: sorted[Math.floor(N * .90) - 1], | |
95: sorted[Math.floor(N * .95) - 1], | |
98: sorted[Math.floor(N * .98) - 1], | |
99: sorted[Math.floor(N * .99) - 1], | |
100: sorted[N - 1], | |
}; | |
return {mean, sd, perc, total: history_total}; | |
}; |
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