Take some memory and release it to test the GC

test_gc.js

var testString="0123456789";

setInterval(function (){
  console.log("Mem:", Math.round(process.memoryUsage().rss/1000000), " Mb ", process.memoryUsage(), "Len:",testString.length);
}, 1 * 1000);
  
for (i=0;i<20;i++){
  testString=testString+testString; //Double: 10 * 10 ^ 
}
//Now testString=10.000.000 characters, which is roughly 20 Mb.

setTimeout(function(){
  testString="";
  //Now back to 0;
},2000)