title: W3WP.EXE using 100% CPU - where to start?
body: <p>An ASP.NET web app running on IIS6 periodically shoots the CPU up to 100%. It's the W3WP that's responsible for nearly all CPU usage during these episodes. The CPU stays pinned at 100% anywhere from a few minutes to over an hour. </p>
  
  <p>This is on a staging server and the site is only getting very light traffic from testers at this point. </p>
  
  <p>We've running ANTS profiler on the server, but it's been unenlightening. </p>
  
  <p>Where can we start finding out what's causing these episodes and what code is keeping the CPU busy during all that time?</p>