meteor-heapsave

Take Heapdump and save them into S3

Install

mrt add heapsave

Usage

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

// save heapdumps per every hour
Meteor.setInterval(function() {
  var dumpName = 'myapp-' + Date.now();
  save(dumpName);
}, 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