ADOOR_ACE/node_modules/dtrace-provider/test/gc2.js

// node --expose_gc ...

var d = require('../dtrace-provider');
var dtp = d.createDTraceProvider("testlibusdt");

// don't assign the returned probe object anywhere
var p = dtp.addProbe("gcprobe");
dtp.enable();

// run GC
gc();

// probe object should still be around
dtp.fire("gcprobe", function() {
    return [];
});

dtp = "something else";
gc();

p.fire(function() {
    return [];
});

p = "something else";

gc();