title: Node.js thread pool and core usage
body: <p>I've read tons of articles and stackoverflow questions, and I saw a lot of information about thread pool, but no one talks about <strong>physical CPU core</strong> usage. I  believe this question is not duplicated.</p>
  
  <p>Given that I have a quad-core computer and libuv thread pool size of 4, will Node.js utilize all those 4 cores when processing lots of i/o requests(maybe more than thousands)?</p>
  
  <p>I'm also curious that which <strong>i/o request</strong> uses <strong>thread pool</strong>. No one gives clear and full list of request. I know that Node.js event loop is single threaded but uses a thread pool to handle i/o such as accessing disk and db.</p>