overleaf/services/web/frontend/js/infrastructure/cm6-performance.ts
Alasdair Smith 47b3b72076 Merge pull request #9938 from overleaf/revert-9935-revert-9901-as-td-cm6-perf-editing-sessions
Bring back reporting of CM6 perf measurement in editing sessions

GitOrigin-RevId: 236c6e23f09a2ddaebf1c231ed77404c4b64179d
2022-10-13 08:04:05 +00:00

80 lines
2 KiB
TypeScript

import { Transaction } from '@codemirror/state'
const TIMER_START_NAME = 'CM6-BeforeUpdate'
const TIMER_END_NAME = 'CM6-AfterUpdate'
const TIMER_MEASURE_NAME = 'CM6-Update'
let latestDocLength = 0
export function timedDispatch(dispatchFn: (tr: Transaction) => void) {
return (tr: Transaction) => {
performance.mark(TIMER_START_NAME)
dispatchFn(tr)
performance.mark(TIMER_END_NAME)
if (tr.isUserEvent('input')) {
performance.measure(TIMER_MEASURE_NAME, TIMER_START_NAME, TIMER_END_NAME)
}
latestDocLength = tr.state.doc.length
}
}
function calculateMean(durations: number[]) {
if (durations.length === 0) return 0
const sum = durations.reduce((acc, entry) => acc + entry, 0)
return sum / durations.length
}
function calculateMedian(sortedDurations: number[]) {
if (sortedDurations.length === 0) return 0
const middle = Math.floor(sortedDurations.length / 2)
if (sortedDurations.length % 2 === 0) {
return (sortedDurations[middle - 1] + sortedDurations[middle]) / 2
}
return sortedDurations[middle]
}
function calculate95thPercentile(sortedDurations: number[]) {
if (sortedDurations.length === 0) return 0
const index = Math.round((sortedDurations.length - 1) * 0.95)
return sortedDurations[index]
}
export function reportCM6Perf() {
// Get entries triggered by keystrokes
const cm6Entries = performance.getEntriesByName(
TIMER_MEASURE_NAME,
'measure'
) as PerformanceMeasure[]
const inputDurations = cm6Entries
.map(({ duration }) => duration)
.sort((a, b) => a - b)
const max = inputDurations.reduce((a, b) => Math.max(a, b), 0)
const mean = calculateMean(inputDurations)
const median = calculateMedian(inputDurations)
const ninetyFifthPercentile = calculate95thPercentile(inputDurations)
performance.clearMeasures(TIMER_MEASURE_NAME)
return {
max,
mean,
median,
ninetyFifthPercentile,
docLength: latestDocLength,
numberOfEntries: inputDurations.length,
}
}
window._reportCM6Perf = () => {
console.log(reportCM6Perf())
}