Node.js simple script memory leak

Here is a simple code

var fn = function () {
    return null;
}

setInterval(fn, 100);

setInterval(function () {
    global.gc();
    console.log(process.memoryUsage().rss);
}, 1000);

      

        
        
        
      

    

Runnig

node --expose-gc / tmp / test.js

Result:

10330112
10596352
10596352
10596352
10932224
10932224
10932224
... several minutes 
11198464
11198464
11198464

      

        
        
        
      

    

Why is memory increasing?