The setup helps to monitor memory used by node process to execute a function

test_node_process_memory_usage.js

const myFunction = async (args) => {
  // do something in this function whose memory you want to monitor
  return 0;
}

function sleep(ms) {
    return new Promise((resolve) => {
        console.log(`***\n***\nsleeping for ${ms / 1000} seconds`)
        setTimeout(resolve, ms);
    });
}

const mem = (val) => `${Math.round((val / 1024) * 100) / 100} KB`;

const memoryUsage = () => {
    return setInterval(() => {
        const u = process.memoryUsage();
        console.log(
            'rss', mem(u.rss),
            // '\ttotal', mem(u.heapTotal),
            '\tused', mem(u.heapUsed),
            '\text', mem(u.external),
            // '\tarr', mem(u.arrayBuffers)
        );
    }, 2000);
}

const processApp = async () => {
    try {
        // start buffer time to see initial memory usage
        await sleep(5000);
        
        console.time('process')
        console.log('started process');
        
        // memory consuming function called here
        const data = await myFunction(args);
      
        console.log('after function finished');
        
        // end buffer time to watch memory usage
        await sleep(30000);
        
        console.log('end process');
        console.timeEnd('process')
    } catch (error) {
        console.log('process error', error);
    }
}

const runApp = async () => {
    const logMem = memoryUsage();
    await processApp();
    clearInterval(logMem);
}
runApp();