Clock-based Profiling for OpenMP Programs

If clock-based profiling is performed on an OpenMP program, two additional metrics are provided: OpenMP Work and OpenMP Wait.

On the Solaris OS, OpenMP Work accumulates when work is being done either serially or in parallel. OpenMP Wait accumulates when the OpenMP runtime is waiting for synchronization, and accumulates whether the wait is using CPU time or sleeping, or when work is being done in parallel, but the thread is not scheduled on a CPU.

On the Linux OS, OpenMP Work and OpenMP Wait are accumulated only when the process is active in either user or system mode. Unless you have specified that OpenMP should do a busy wait, OpenMP Wait on Linux is not useful.