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🚧 Work in progress! 🚧

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:

{
  "bytes_sent": 2661331,
  "async_traces": [
    {
      "count": 60,
      "types": [
        "PROMISE"
      ],
      "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"
    }
  ],
  "observer_stats": [
    {
      "key": "child::{\"parentId\":\"MBLMPnnYYCu3RC99p\"}",
      "added": 5600,
      "changed": 3234,
      "removed": 0,
      "started": 56,
      "stopped": 42,
      "lagging_added": 0,
      "lagging_changed": 0,
      "lagging_removed": 0,
      "score": 14854
    }
  ]
}

Downloading the stat file

You can call the following HTTP endpoint to download the stat file:

GET /meteor-perf.json

License

MIT