Menu Close
Settings Close

Language and Page Formatting Options

3.2.2.2. The Operating System

It is difficult to determine how much processing power is consumed by the operating system. The reason for this is that operating systems use a mixture of process-level and system-level code to perform their work. While, for example, it is easy to use a process monitor to determine what the process running a daemon or service is doing, it is not so easy to determine how much processing power is being consumed by system-level I/O-related processing (which is normally done within the context of the process requesting the I/O.)
In general, it is possible to divide this kind of operating system overhead into two types:
  • Operating system housekeeping
  • Process-related activities
Operating system housekeeping includes activities such as process scheduling and memory management, while process-related activities include any processes that support the operating system itself, such as processes handling system-wide event logging or I/O cache flushing.