record allocations for 5s -> take a census

census.js

dbg = null;
Components.utils.forceGC();

Components.utils.import("resource://gre/modules/devtools/Loader.jsm");
Debugger = devtools.require("Debugger");

dbg = devtools.require("devtools/server/actors/utils/make-debugger")({
  findDebuggees: dbg => dbg.findAllGlobals(),
  shouldAddNewGlobalAsDebuggee: () => true
});
dbg.addDebuggees();

console.log(dbg);

dbg.memory.allocationSamplingProbability = 1;
dbg.memory.trackingAllocationSites = true;

devtools.require("sdk/timers").setTimeout(() => {
  console.log("=====================================================================================");

  console.time("census");
  let census = dbg.memory.takeCensus({
    breakdown: {
      by: "allocationStack",
      then: { by: "count", count: true, bytes: true },
      noStack: { by: "count", count: true, bytes: true }
    },
  });
  console.timeEnd("census");
  console.log(census);

  console.log("=====================================================================================");

  let i = 0;
  census.forEach((v, k) => {
    if (i++ >= 10)
      return;

    console.log(k.toString())
    console.log(v);
    console.log();
  })
}, 5000);