I often help people who are reporting that CF is “running hot on the CPU”, maybe reaching 80 or even 100% of the CPU, whether in spikes or for extended periods. What might you propose people look at, when you’ve heard that? I’ve heard all kinds of things over the years, often focused on coding, or perhaps jvm tuning.
But as is often the case in a lot of the CF server troubleshooting consulting I do, I find the causes to be far less often what most people seem to suspect. So what would I look for when someone reported high CPU in ColdFusion (or Railo)? Read on.