title: How many threads is too many?
body: <p>I am writing a server, and I send each action of into a separate thread when the request is received. I do this because almost every request makes a database query. I am using a threadpool library to cut down on construction/destruction of threads.</p>
  <p>My question is: what is a good cutoff point for I/O threads like these? I know it would just be a rough estimate, but are we talking hundreds? Thousands?</p>
  <p>How would I go about figuring out what this cutoff would be?</p>
  <hr />
  <h3>EDIT:</h3>
  <p>Thank you all for your responses, it seems like I am just going to have to test it to find out my thread count ceiling. The question is though: how do I know I've hit that ceiling? What exactly should I measure?</p>