Test Promise.all

test.js

const sleep = ms => new Promise(resolve => setTimeout(resolve, ms));

(async () => {
  const reportGC = async () => {
    global.gc();
    await sleep(1000);
    console.log('GC\nb() results:\n', process.memoryUsage());
  };

  let endPromise = Promise.resolve();

  const log = async msg => {
    await sleep(100);
    // console.log('log', msg);
    return msg;
  };

  const logTransport = async msg => {
    const logPromise = log(msg);
    endPromise = (async () => {
      await Promise.all([endPromise, logPromise]);
    })();
    await logPromise;
  };

  for (let j = 0; j < 30; j++) {
    for (let i = 0; i < 10000; i++) {
      logTransport(i);
    }
    console.log('end', await endPromise);
    await reportGC();
  }
})();