it is used to check the garbage collector working and performance, CLR Profiler enables you to look at the managed heap of a process and investigate the behavior of the garbage collector. Using the various views in the tool, you can obtain useful information about the execution, allocation, and memory consumption of your application.
CLR Profiler is not a starting point for analyzing problems. Rather, it helps you identify and isolate problematic code and track down memory leaks. Using CLR Profiler, you can identify code that allocates too much memory, causes too many garbage collections, and holds on to memory for too long.
check below link to see how to use CLR profiler
Editor, DotNetSpider MVM
Microsoft MVP 2014 [ASP.NET/IIS]