title: How to check how many threads are currently running when using TBB?
body: <p>I am running Intel TBB on clusters. However, I don't know how to check how many threads are active and running. Is there a way to check this?</p>
  
  <p>Let's say I have 16 cores, so I would like to know if all 16 cores are now being used in my TBB code. This would make sure there is no problem with my system.</p>