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Code Issues Releases Wiki Activity

Optimise some tiddler store operations 

I noticed that the rendering of a TOC with around 200 entries seemed frustratingly slow.

First, I analysed the execution of the code using the Chrome developer tools "timeline" tab: prepare by switching to the "Tools" tab, then start profiling, switch to the "Contents" tab, and then stop profiling once it has displayed. I then used the "bottom-up" view to dectermine that the various Object.keys() calls in the main wiki store were taking around 500ms of the overall time.

Before making any code changes, I also used TW's built in instrumentation to get some baseline timings: I found that the main refresh cycle was taking around 3.0s when rendering the Contents tab.

I then performed the attached simple optimisations of caching the list of tiddler titles and the list of shadow tiddler titles.

The results bring the overall main refresh time down to about 1.9s, a nearly 50% improvement.

The moral of the story is that the first rule of optimisation is measurement...
This commit is contained in:
Jermolene 2017-12-21 15:46:01 +00:00
parent e27497d43d
commit 254e1ca7f7
1 changed files with 24 additions and 25 deletions
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49
boot/boot.js
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@ -902,9 +902,11 @@ $tw.Wiki = function(options) {
options = options || {};
var self = this,
tiddlers = Object.create(null), // Hashmap of tiddlers
tiddlerTitles = [], // Array of tiddler titles
pluginTiddlers = [], // Array of tiddlers containing registered plugins, ordered by priority
pluginInfo = Object.create(null), // Hashmap of parsed plugin content
shadowTiddlers = options.shadowTiddlers || Object.create(null); // Hashmap by title of {source:, tiddler:}
shadowTiddlers = options.shadowTiddlers || Object.create(null), // Hashmap by title of {source:, tiddler:}
shadowTiddlerTitles = Object.keys(shadowTiddlers);
// Add a tiddler to the store
this.addTiddler = function(tiddler) {
@ -918,6 +920,7 @@ $tw.Wiki = function(options) {
// Uncomment the following line for detailed logs of all tiddler writes
// console.log("Adding",title,tiddler)
tiddlers[title] = tiddler;
tiddlerTitles = Object.keys(tiddlers);
this.clearCache(title);
this.clearGlobalCache();
this.enqueueTiddlerEvent(title);
@ -931,6 +934,7 @@ $tw.Wiki = function(options) {
// console.log("Deleting",title)
if($tw.utils.hop(tiddlers,title)) {
delete tiddlers[title];
tiddlerTitles = Object.keys(tiddlers);
this.clearCache(title);
this.clearGlobalCache();
this.enqueueTiddlerEvent(title,true);
@ -952,30 +956,28 @@ $tw.Wiki = function(options) {
// Get an array of all tiddler titles
this.allTitles = function() {
return Object.keys(tiddlers);
return tiddlerTitles.slice(0);
};
// Iterate through all tiddler titles
this.each = function(callback) {
var titles = Object.keys(tiddlers),
index,titlesLength,title;
for(index = 0, titlesLength = titles.length; index < titlesLength; index++) {
title = titles[index];
var index,titlesLength,title;
for(index = 0, titlesLength = tiddlerTitles.length; index < titlesLength; index++) {
title = tiddlerTitles[index];
callback(tiddlers[title],title);
}
};
// Get an array of all shadow tiddler titles
this.allShadowTitles = function() {
return Object.keys(shadowTiddlers);
return shadowTiddlerTitles.slice(0);
};
// Iterate through all shadow tiddler titles
this.eachShadow = function(callback) {
var titles = Object.keys(shadowTiddlers),
index,titlesLength,title;
for(index = 0, titlesLength = titles.length; index < titlesLength; index++) {
title = titles[index];
var index,titlesLength,title;
for(index = 0, titlesLength = shadowTiddlerTitles.length; index < titlesLength; index++) {
title = shadowTiddlerTitles[index];
var shadowInfo = shadowTiddlers[title];
callback(shadowInfo.tiddler,title);
}
@ -983,15 +985,13 @@ $tw.Wiki = function(options) {
// Iterate through all tiddlers and then the shadows
this.eachTiddlerPlusShadows = function(callback) {
var titles = Object.keys(tiddlers),
index,titlesLength,title;
for(index = 0, titlesLength = titles.length; index < titlesLength; index++) {
title = titles[index];
var index,titlesLength,title;
for(index = 0, titlesLength = tiddlerTitles.length; index < titlesLength; index++) {
title = tiddlerTitles[index];
callback(tiddlers[title],title);
}
titles = Object.keys(shadowTiddlers);
for(index = 0, titlesLength = titles.length; index < titlesLength; index++) {
title = titles[index];
for(index = 0, titlesLength = shadowTiddlerTitles.length; index < titlesLength; index++) {
title = shadowTiddlerTitles[index];
if(!Object.prototype.hasOwnProperty.call(tiddlers,title)) {
var shadowInfo = shadowTiddlers[title];
callback(shadowInfo.tiddler,title);
@ -1001,10 +1001,9 @@ $tw.Wiki = function(options) {
// Iterate through all the shadows and then the tiddlers
this.eachShadowPlusTiddlers = function(callback) {
var titles = Object.keys(shadowTiddlers),
index,titlesLength,title;
for(index = 0, titlesLength = titles.length; index < titlesLength; index++) {
title = titles[index];
var index,titlesLength,title;
for(index = 0, titlesLength = shadowTiddlerTitles.length; index < titlesLength; index++) {
title = shadowTiddlerTitles[index];
if(Object.prototype.hasOwnProperty.call(tiddlers,title)) {
callback(tiddlers[title],title);
} else {
@ -1012,9 +1011,8 @@ $tw.Wiki = function(options) {
callback(shadowInfo.tiddler,title);
}
}
titles = Object.keys(tiddlers);
for(index = 0, titlesLength = titles.length; index < titlesLength; index++) {
title = titles[index];
for(index = 0, titlesLength = tiddlerTitles.length; index < titlesLength; index++) {
title = tiddlerTitles[index];
if(!Object.prototype.hasOwnProperty.call(shadowTiddlers,title)) {
callback(tiddlers[title],title);
}
@ -1130,6 +1128,7 @@ $tw.Wiki = function(options) {
});
}
});
shadowTiddlerTitles = Object.keys(shadowTiddlers);
this.clearCache(null);
this.clearGlobalCache();
};