Types of User Threads

Sometimes, TotalView can identify which threads are performing service activities. In other cases, this is not possible. While some threads can be identified (and on some architectures this may not be possible), you are often forced to identify which user threads are performing service activities.

In the following diagram, one of the three nonmanager worker threads performs a different kind of activity than the other two threads. As an example, this could be a thread whose sole function is to send data to a printer in response to a request from either of the other two threads.

User, Service, and Manager Threads

So, while this figure shows five threads, most of your efforts will revolve around just two threads. These threads two threads are called worker threads.