stekaiser / meteor-heapsave

Take Heapdumps and save them into S3

meteor-heapsave

Take Heapdump and save them into S3

Install

meteor add arunoda:heapsave

Usage

var heapsave = HeapSave.toS3('access-key', 'access-secret', 'bucket');

function saveHeap(){
	var saveName = 'myapp-' + Date.now();
  	heapsave(saveName);
}

// Save heapdump after 1 minute
Meteor.setTimeout(saveHeap, 1000*60);

// Save heapdumps every hour
Meteor.setInterval(saveHeap, 1000*60*60);

Notice

• In order to get a heapdump you need to have at least twice of Memory on the system. So it's better to turn on swap if you are running under a low memory server.
• Every heapdump will cause v8 to call gc(). It is a blocking operation.
• Heapdump will be saved to disk using a child_process.
• Heapdump will be compressed before sending it to s3. Compression also done via a child process.
• refer node-heapdump project for more information

Analyzing

Heapdumps can be analyzed using Chrome dev tools.

• download your dumps from s3
• untar them
• load them into chrome dev tool under "profiles" tab

• learn how to analyze heap and detect memory leaks

Contributors

Written by Arunoda from Kadira. Meteor 1.2 support added by the Nitrolabs team.