This section displays (see Figure 4-6) information on the number of Java threads that existed both before and after the recording.
The value of Number of deamon threads before/after recording is the number of deamon threads. A deamon thread is a thread that runs in the background to support the runtime environment, for example, a garbage collector thread. The JVM exists when all non-daemon threads have completed.
The value System total of # (number) context switches per second is fetched from the operating system. An unusually high context switch value compared to other applications may indicate contention in your application.