Understanding the Scoreboard Process in Computer Architecture

What is the purpose of the scoreboard in computer architecture?

A. To resolve data hazards in the dispatch stage

B. To enhance system throughput

C. To increase processor speed

Answer:

The correct answer is B. To enhance system throughput.

In computer architecture, the scoreboard is a register-based process that plays a crucial role in enhancing system throughput. It includes additional bits for each instruction in the instruction set to manage the status of operands and instructions effectively. The primary function of a scoreboard is to facilitate parallel execution of instructions and identify and resolve dependencies, such as RAW hazards.

RAW hazard is a type of data hazard that occurs when a processor tries to execute an instruction that relies on an operand not yet loaded into the register bank. This situation forces the processor to wait until the operand is available, thus reducing system efficiency and performance.

Contrary to popular belief, the scoreboard does not resolve RAW hazards in the dispatch stage but rather during the execution stage. By efficiently managing instruction dependencies and enabling parallel execution, the scoreboard contributes to optimizing system performance and throughput.