benchpress
Version:
Benchpress - a framework for e2e performance tests
80 lines • 12.2 kB
JavaScript
/**
* @param {Object} perfProfile The perf profile JSON object.
* @return {Object[]} An array of recognized events that are captured
* within the perf profile.
*/
export function convertPerfProfileToEvents(perfProfile) {
var inProgressEvents = new Map(); // map from event name to start time
var finishedEvents = []; // Event[] finished events
var addFinishedEvent = function (eventName, startTime, endTime) {
var categorizedEventName = categorizeEvent(eventName);
var args = undefined;
if (categorizedEventName == 'gc') {
// TODO: We cannot measure heap size at the moment
args = { usedHeapSize: 0 };
}
if (startTime == endTime) {
// Finished instantly
finishedEvents.push({ ph: 'X', ts: startTime, name: categorizedEventName, args: args });
}
else {
// Has duration
finishedEvents.push({ ph: 'B', ts: startTime, name: categorizedEventName, args: args });
finishedEvents.push({ ph: 'E', ts: endTime, name: categorizedEventName, args: args });
}
};
var samples = perfProfile.threads[0].samples;
// In perf profile, firefox samples all the frames in set time intervals. Here
// we go through all the samples and construct the start and end time for each
// event.
for (var i = 0; i < samples.length; ++i) {
var sample = samples[i];
var sampleTime = sample.time;
// Add all the frames into a set so it's easier/faster to find the set
// differences
var sampleFrames = new Set();
sample.frames.forEach(function (frame) { sampleFrames.add(frame.location); });
// If an event is in the inProgressEvents map, but not in the current sample,
// then it must have just finished. We add this event to the finishedEvents
// array and remove it from the inProgressEvents map.
var previousSampleTime = (i == 0 ? -1 : samples[i - 1].time);
inProgressEvents.forEach(function (startTime, eventName) {
if (!(sampleFrames.has(eventName))) {
addFinishedEvent(eventName, startTime, previousSampleTime);
inProgressEvents.delete(eventName);
}
});
// If an event is in the current sample, but not in the inProgressEvents map,
// then it must have just started. We add this event to the inProgressEvents
// map.
sampleFrames.forEach(function (eventName) {
if (!(inProgressEvents.has(eventName))) {
inProgressEvents.set(eventName, sampleTime);
}
});
}
// If anything is still in progress, we need to included it as a finished event
// since recording ended.
var lastSampleTime = samples[samples.length - 1].time;
inProgressEvents.forEach(function (startTime, eventName) {
addFinishedEvent(eventName, startTime, lastSampleTime);
});
// Remove all the unknown categories.
return finishedEvents.filter(function (event) { return event.name != 'unknown'; });
}
// TODO: this is most likely not exhaustive.
export function categorizeEvent(eventName) {
if (eventName.indexOf('PresShell::Paint') > -1) {
return 'render';
}
else if (eventName.indexOf('FirefoxDriver.prototype.executeScript') > -1) {
return 'script';
}
else if (eventName.indexOf('forceGC') > -1) {
return 'gc';
}
else {
return 'unknown';
}
}
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Here\n  // we go through all the samples and construct the start and end time for each\n  // event.\n  for (var i = 0; i < samples.length; ++i) {\n    var sample = samples[i];\n    var sampleTime = sample.time;\n\n    // Add all the frames into a set so it's easier/faster to find the set\n    // differences\n    var sampleFrames = new Set();\n    sample.frames.forEach(function(frame) { sampleFrames.add(frame.location); });\n\n    // If an event is in the inProgressEvents map, but not in the current sample,\n    // then it must have just finished. We add this event to the finishedEvents\n    // array and remove it from the inProgressEvents map.\n    var previousSampleTime = (i == 0 ? /* not used */ -1 : samples[i - 1].time);\n    inProgressEvents.forEach(function(startTime, eventName) {\n      if (!(sampleFrames.has(eventName))) {\n        addFinishedEvent(eventName, startTime, previousSampleTime);\n        inProgressEvents.delete(eventName);\n      }\n    });\n\n    // If an event is in the current sample, but not in the inProgressEvents map,\n    // then it must have just started. We add this event to the inProgressEvents\n    // map.\n    sampleFrames.forEach(function(eventName) {\n      if (!(inProgressEvents.has(eventName))) {\n        inProgressEvents.set(eventName, sampleTime);\n      }\n    });\n  }\n\n  // If anything is still in progress, we need to included it as a finished event\n  // since recording ended.\n  var lastSampleTime = samples[samples.length - 1].time;\n  inProgressEvents.forEach(function(startTime, eventName) {\n    addFinishedEvent(eventName, startTime, lastSampleTime);\n  });\n\n  // Remove all the unknown categories.\n  return finishedEvents.filter(function(event) { return event.name != 'unknown'; });\n}\n\n// TODO: this is most likely not exhaustive.\nexport function categorizeEvent(eventName: string): string {\n  if (eventName.indexOf('PresShell::Paint') > -1) {\n    return 'render';\n  } else if (eventName.indexOf('FirefoxDriver.prototype.executeScript') > -1) {\n    return 'script';\n  } else if (eventName.indexOf('forceGC') > -1) {\n    return 'gc';\n  } else {\n    return 'unknown';\n  }\n}\n"]}