Dump the NODE V8 heap to a file #devsample #v8

dump.js

/* Dump the NODE V8 heap to a file
 * Usage:
 * 1. Install the node-heapdump: npm install node-heapdump
 * 2. call below code when you need dump the heap.
 *       require('./dump.js')('test');
 */
'use strict';

var path = require('path'),
    util = require('util');

exports = module.exports = function(name) {
    var heapdump, now, dumpFileSuffix, dumpFile;

    try {
        heapdump = require('heapdump');
    }
    catch (err) {
        util.error('cannot find heapdump');
        return;
    }
    name = name || 'node-heapdump';
    now = Date.now();
    dumpFileSuffix = util.format('%s-%d-%d.heapsnapshot', 
        name, process.pid, now);
    dumpFile = path.join(__dirname, dumpFileSuffix); 

    util.log('Begin dump heap to ' + dumpFile);
    try {
        heapdump.writeSnapshot(dumpFile);
    }
    catch (err) {
        util.log('Err on the dump heap to ' + dumpFile);
        return;
    }
    util.log('End dump heap to ' +  dumpFile);
};