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Remove accidental file addition. (r=khuey)
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Chris Leary
parent
4c008cf13d
commit
c27abc3c5f
316
jsgc-study.js
316
jsgc-study.js
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// chrome://testpilot/content/debug.html
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/*
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* JS GC study: a TestPilot study to monitor GC frequency and duration.
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* This will work on any operating system where ctypes can find the symbols it
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* requires in the shared objects/DLLs.
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*
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* The JS runtime has a gcInfoEnabled value that is initialized to false when
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* the runtime is initialized (i.e. on browser startup). Installing the
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* GCObserver enables it, and uninstalling disables it. In the event of a
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* crash, the next startup will proceed in the usual fashion: if this study
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* gets loaded and the GCObserver gets installed, then the value will be set to
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* true and data will start being collected.
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*/
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BaseClasses = require("study_base_classes.js");
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// experimentInfo is an obect providing metadata about the study.
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exports.experimentInfo = {
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testName: "JavaScript memory usage",
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testId: 1717,
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testInfoUrl: "https://", // URL of page explaining your study
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summary: "This study aims to explore how well JavaScript manages memory over time. " +
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"It will periodically collect data on the browser's JavaScript memory " +
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"reclamation performance.",
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thumbnail: "http://", // URL of image representing your study
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// (will be displayed at 90px by 90px)
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versionNumber: 1, // update this when changing your study
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// so you can identify results submitted from different versions
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duration: 1, // a number of days - fractions OK.
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minTPVersion: "1.0", // Test Pilot versions older than this
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// will not run the study.
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minFXVersion: "4.0b1", // Firefox versions older than this will
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// not run the study.
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// For studies that automatically recur:
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recursAutomatically: false,
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recurrenceInterval: 60, // also in days
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// When the study starts:
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startDate: null, // null means "start immediately".
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optInRequired: false // opt-in studies not yet implemented
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};
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var GCInfoStructFields = [
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{name: 'appTime', kind: 'double', desc: 'Elapsed application time'},
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{name: 'gcTime', kind: 'double', desc: 'Total time to perform garbage collection'},
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{name: 'waitTime', kind: 'double', desc: 'GC start wait time'},
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{name: 'markTime', kind: 'double', desc: 'JS entity traversal time'},
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{name: 'sweepTime', kind: 'double', desc: 'JS entity destruction time'},
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{name: 'sweepObjTime', kind: 'double', desc: 'JS object destruction time'},
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{name: 'sweepStringTime', kind: 'double', desc: 'JS string destruction time'},
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{name: 'sweepShapeTime', kind: 'double', desc: 'JS shape destruction time'},
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{name: 'destroyTime', kind: 'double', desc: 'Heap arena destruction time'},
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{name: 'endTime', kind: 'double', desc: 'GC end wait time'},
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{name: 'isCompartmental', kind: 'bool', desc: 'GC is compartmental'},
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];
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const GCInfoStructFieldNames = [field.name for each (field in GCInfoStructFields)]
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function makeCTypeProps(ctypes, fields) {
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const kindToCType = {
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double: ctypes.float64_t,
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bool: ctypes.bool,
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};
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let attrs = [];
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for each (field in fields) {
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let record = {};
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record[field.name] = kindToCType[field.kind];
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attrs.push(record);
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}
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return attrs;
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}
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function makeColumns(fields) {
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const kindToType = {
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double: BaseClasses.TYPE_DOUBLE,
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bool: BaseClasses.TYPE_INT_32,
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};
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let columns = [];
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for each (field in fields)
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columns.push({property: field.name, type: kindToType[field.kind], displayName: field.desc});
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return columns;
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}
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function zipObj(names, values) {
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let o = {};
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for (let i in names)
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o[names[i]] = values[i];
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return o;
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}
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exports.dataStoreInfo = {
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fileName: "testpilot_jsgc_results.sqlite",
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tableName: "jsgc_info",
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columns: makeColumns(GCInfoStructFields),
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};
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function GCGlobalObserver() {
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GCGlobalObserver.baseConstructor.call(this);
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}
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BaseClasses.extend(GCGlobalObserver, BaseClasses.GenericGlobalObserver);
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GCGlobalObserver.prototype.onExperimentStartup = function(store) {
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GCGlobalObserver.superClass.onExperimentStartup.call(this, store);
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dump('Installing GC observer\n');
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try {
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this.gcObserver = GCObserver.install(store);
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} catch (e) {
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this.console.debug('Exception during install: ' + e);
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}
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dump('Done installing GC observer\n');
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};
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GCGlobalObserver.prototype.getStudyMetadata = function() {
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return [{droppedGCInfoCount: this.gcObserver.dropCount}];
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};
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GCGlobalObserver.prototype.onExperimentShutdown = function(store) {
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GCGlobalObserver.superClass.onExperimentShutdown.call(this, store);
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if (this.gcObserver)
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this.gcObserver.uninstall();
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};
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// Called when the study is over or has been cancelled.
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GCGlobalObserver.prototype.doExperimentCleanup = function() {
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// Nothing to do.
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};
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// Instantiate and export the global observer (required!)
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exports.handlers = new GCGlobalObserver();
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// Defines what will show up on the study detail view page.
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function JSGCWebContent() {
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JSGCWebContent.baseConstructor.call(this, exports.experimentInfo);
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}
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BaseClasses.extend(JSGCWebContent, BaseClasses.GenericWebContent);
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JSGCWebContent.prototype.__defineGetter__("dataCanvas",
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function() {
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return '<div class="dataBox"><h3>View Your Data:</h3>' +
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this.dataViewExplanation +
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this.rawDataLink +
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'<div id="data-plot-div" style="width:480x;height:480px"></div>' +
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this.saveButtons + '</div>';
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});
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JSGCWebContent.prototype.__defineGetter__("dataViewExplanation",
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function() {
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return "This plot shows the garbage collection duration during the course of the application's lifetime.";
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});
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// This function is called when the experiment page load is done
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JSGCWebContent.prototype.onPageLoad = function(experiment,
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document,
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graphUtils) {
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experiment.getDataStoreAsJSON(function(rawData) {
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let compartmental = [];
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let full = [];
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for each (row in rawData) {
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let series = row.isCompartmental ? compartmental : full;
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series.push([row.appTime, row.gcTime]);
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}
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let div = document.getElementById('data-plot-div');
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graphUtils.plot(div,
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[
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{label: 'Compartmental GCs (ms)',
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data: compartmental,
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points: {show: true}},
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{label: 'Full GCs (ms)',
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data: full,
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points: {show: true}},
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]
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);
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});
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};
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// Instantiate and export the web content (required!)
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exports.webContent = new JSGCWebContent();
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const GCINFO_READ_INTERVAL_SECONDS = 30;
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var GCObserver = {
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alreadyInstalled : false,
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selfPingInterval: GCINFO_READ_INTERVAL_SECONDS * 1000,
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ctypes: null,
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libxul: null,
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runtime: null,
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GCInfoStruct: null,
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getGCInfo: null,
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droppedGCInfo: null,
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setGCInfoEnabled: null,
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wasGCInfoEnabled: null,
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store: null,
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dropCount: 0,
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install: function GCObserver__install(store) {
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this.debug('Installing GCObserver');
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if (this.alreadyInstalled)
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return;
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this.debug('Adding GCObserver');
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try {
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this.createCTypes();
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} catch (e) {
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this.debug('Failed to create ctypes: ' + e);
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return;
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}
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this.store = store;
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this.wasGCInfoEnabled = this.getGCInfoEnabled(this.runtime);
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this.setGCInfoEnabled(this.runtime, true);
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if (!this.getGCInfoEnabled(this.runtime)) {
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throw new Error('GC info could not be enabled');
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}
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/* Once GC info has been successfully enabled, we are able to uninstall. */
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this.debug('Successfully enabled');
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this.alreadyInstalled = true;
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this.debug('Initiating self-ping');
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this.selfPingTimer = Cc['@mozilla.org/timer;1'].createInstance(Ci.nsITimer);
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this.pingSelf();
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this.debug('Finished installing');
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},
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uninstall: function GCObserver__uninstall() {
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if (!this.alreadyInstalled)
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return;
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if (this.selfPingTimer)
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this.selfPingTimer.cancel();
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this.selfPingTimer = null;
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this.setGCInfoEnabled(this.wasGCInfoEnabled);
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this.alreadyInstalled = false;
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},
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debug: function GCObserver__debug(msg) {
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dump('//// ' + msg + '\n');
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},
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recordGCInfo: function GCObserver__alwaysRecord(fieldContents) {
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this.debug('Fields: ' + fieldContents.join(' '));
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this.store.storeEvent(zipObj(GCInfoStructFieldNames, fieldContents));
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},
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tryFindLibXUL: function GCObserver__tryFindLibXUL(ctypes) {
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try { return ctypes.open(ctypes.libraryName('xul')); } catch (e) {}
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try { return ctypes.open(ctypes.libraryName('mozjs')); } catch (e) {}
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throw new Error('could not find SpiderMonkey dll');
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},
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createCTypes: function GCObserver__createCTypes() {
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Components.utils.import('resource://gre/modules/ctypes.jsm');
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this.ctypes = ctypes;
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let libxul = this.tryFindLibXUL(ctypes);
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this.libxul = libxul;
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this.runtime = ctypes.getRuntime(ctypes.voidptr_t);
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let GCInfo = this.createGCInfoStruct();
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this.getGCInfo = libxul.declare('JS_GCInfoFront', ctypes.default_abi, GCInfo.ptr, ctypes.voidptr_t);
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this.popGCInfo = libxul.declare('JS_GCInfoPopFront', ctypes.default_abi, ctypes.bool, ctypes.voidptr_t);
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this.setGCInfoEnabled = libxul.declare('JS_SetGCInfoEnabled', ctypes.default_abi, ctypes.void_t, ctypes.voidptr_t, ctypes.bool);
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this.getGCInfoEnabled = libxul.declare('JS_GetGCInfoEnabled', ctypes.default_abi, ctypes.bool, ctypes.voidptr_t);
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},
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createGCInfoStruct: function GCObserver__createGCInfoStruct() {
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let ctypes = this.ctypes;
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let GCInfoStruct = this.GCInfoStruct = new ctypes.StructType('GCInfo', makeCTypeProps(ctypes, GCInfoStructFields));
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GCInfoStruct.ptr = new ctypes.PointerType(GCInfoStruct);
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return GCInfoStruct;
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},
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pingSelf: function GCObserver__pingSelf() {
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let self = this;
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const TYPE_ONE_SHOT = 0;
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const TYPE_REPEATING_SLACK = 1;
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this.selfPingTimer.initWithCallback(function dumpAndRepeat() {
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self.dumpGCInfos();
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self.pingSelf();
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}, this.selfPingInterval, TYPE_ONE_SHOT);
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},
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dumpGCInfos: function GCObserver__dumpGCInfos() {
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let self = this;
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let debug = this.debug;
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let rt = this.runtime;
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debug('Dumping GC infos');
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for (var i = 0;; i++) {
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debug('Getting GCInfo');
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let info = this.getGCInfo(rt);
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debug('GCInfo: ' + info);
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if (info.isNull()) {
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debug('Breaking due to null');
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break;
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}
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/* Copy info contents into a temporary object so we can pop the info as quickly as possible. */
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let c = info.contents;
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let data = [c[name] for each (name in GCInfoStructFieldNames)]
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let dropped = this.popGCInfo(rt);
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if (dropped) {
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debug('Dropped!');
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++this.dropCount;
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break;
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}
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self.recordGCInfo(data);
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}
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debug ('Saw ' + i + ' entries');
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}
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};
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