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Available performance improvement from superscalar techniques is limited by three key areas: The degree of intrinsic parallelism in the instruction stream (instructions requiring the same computational resources from the CPU) The complexity and time cost of dependency checking logic and register renaming circuitry; The branch instruction processing
Performance is a measure of the results achieved. Performance efficiency is the ratio between effort expended and results achieved. The difference between current performance and the theoretical performance limit is the performance improvement zone. Another way to think of performance improvement is to see it as improvement in four potential areas:
The dispatch portion of the OS will then select, from the queue of NOT RUNNING processes, one of the waiting processes to transfer to the processor. The chosen process is then relabeled from a NOT RUNNING state to a RUNNING state, and its execution is either begun if it is a new process, or is resumed if it is a process which was interrupted at ...
The dispatcher should be as fast as possible since it is invoked during every process switch. During the context switches, the processor is virtually idle for a fraction of time, thus unnecessary context switches should be avoided. The time it takes for the dispatcher to stop one process and start another is known as the dispatch latency.
Workload Manager (WLM) must be configured correctly for HiperDispatch to work well. Some mainframe users have latent problems with their WLM goal settings which are only exposed with HiperDispatch, so there is an option to disable HiperDispatch in those cases where mainframe users do not want to correct those issues right away.
Dispatch Sources are objects that allow the client to register blocks or functions to execute asynchronously upon system events, such as a socket or file descriptor being ready for reading or writing, or a POSIX signal. Dispatch Groups are objects that allow several tasks to be grouped for later joining. Tasks can be added to a queue as a ...
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The first machine to use out-of-order execution was the CDC 6600 (1964), designed by James E. Thornton, which uses a scoreboard to avoid conflicts. It permits an instruction to execute if its source operand (read) registers aren't to be written to by any unexecuted earlier instruction (true dependency) and the destination (write) register not be a register used by any unexecuted earlier ...