gistfile1.txt

var printMemoryUsage = function() {
  var spawn = require('child_process').spawn,
      getconf  = spawn('getconf', ['PAGESIZE']);

  getconf.stdout.on('data', function (data) {
    var pageSize = parseInt(data, 10);
    console.log('Page size: ' + pageSize);

    var procOutput = spawn('cat', ['/proc/' + process.pid + '/status']);

    procOutput.stdout.on('data', function (data) {
      console.log("/proc/self");
      data.toString('ascii').split('\n').some(function(line) {
          if (line.toLowerCase().indexOf('rss') > 0) {
            console.log(line);
            return true;
          }
        });

    });
  });
}

printMemoryUsage();

console.log("process.memoryUsage():");
console.log(process.memoryUsage());
console.log("KB: " + (process.memoryUsage().rss/1024));

process.memoryUsage():
{ rss: 168558592
, vsize: 8478720
, heapTotal: 3141632
, heapUsed: 2147252
}
KB: 165568

{ rss: 195428352
, vsize: 8523776
, heapTotal: 3141632
, heapUsed: 2203364
}
KB: 191232
/proc/self
VmRSS: 11996 kB