:construction: Work in progress! :construction:
Real-time performance optimization for Meteor apps.
Goal: Help detect oplog flooding and event loop blocking issues in Meteor apps, eventually providing easy to understand diagnostic messages users can act upon.
Installation
meteor add meteor-perf
Usage
Right now it will output a file called meteor-perf.json in the root of your project as your app is running.
This file can be inspected in any code editor that supports JSON.
The object contains the following keys;
bytes_sent:
The amount of data sent from the server to the client in bytes.
async_traces:
An array of objects containing traces for async resources that were created during Event Loop Lag, along with execution count.
observer_stats:
An array of objects containing stat objects for Observer Handles,
the number of operations they performed, and a key to identify them.
The key is composed of the collection and the selector separated by ::.
It groups the stats by selector, so you can see how many operations were performed on a specific query.
Example:
1{ 2 "bytes_sent": 2661331, 3 "async_traces": [ 4 { 5 "count": 60, 6 "types": [ 7 "PROMISE" 8 ], 9 "stack": " at Publication._getCursor (packages/reywood:publish-composite/lib/publication.js:95:36)\n at Publication.publish (packages/reywood:publish-composite/lib/publication.js:26:30)\n at packages/reywood:publish-composite/lib/publication.js:110:17\n at Array.map (<anonymous>)\n at Publication._publishChildrenOf (packages/reywood:publish-composite/lib/publication.js:106:32)\n at Publication._handleAddedAsync (packages/reywood:publish-composite/lib/publication.js:77:18)\n at packages/reywood:publish-composite/lib/publication.js:38:16\n at new Promise (<anonymous>)\n at packages/reywood:publish-composite/lib/publication.js:36:30\n at packages/meteor.js:1399:24" 10 } 11 ], 12 "observer_stats": [ 13 { 14 "key": "child::{\"parentId\":\"MBLMPnnYYCu3RC99p\"}", 15 "added": 5600, 16 "changed": 3234, 17 "removed": 0, 18 "started": 56, 19 "stopped": 42, 20 "lagging_added": 0, 21 "lagging_changed": 0, 22 "lagging_removed": 0, 23 "score": 14854 24 } 25 ] 26}
Downloading the stat file
You can call the following HTTP endpoint to download the stat file:
GET /meteor-perf.json
License
MIT