Performance of the CPU and pipelining

Performance of CPU and pipelining

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Multiple Choice

What is clock speed measured in?

• Hertz

• Watts

• Bytes

• Volts

Explanation Slide...

Clock speed is measured in Hertz, which represents the number of cycles per second. Therefore, the correct answer is Hertz.

Multiple Choice

What does a single gigahertz represent?

• One million operations per second

• One thousand operations per second

• One billion operations per second

• One hundred operations per second

Explanation Slide...

A single gigahertz represents one billion operations per second, making it the correct choice among the options provided.

Explanation Slide...

A single gigahertz represents one billion operations per second, making it the correct choice among the options provided.

Multiple Choice

What is the purpose of the cache in a CPU?

• To store permanent data

• To enhance the graphics

• To store temporary instructions and data

• To cool down the CPU

Explanation Slide...

The purpose of the cache in a CPU is to store temporary instructions and data, allowing for faster access and execution of tasks.

Multiple Choice

What is a core in CPU terms?

• A unit for measuring temperature

• A storage unit for cache

• A complete copy of a CPU

• A unit for measuring speed

Explanation Slide...

A core in CPU terms refers to a complete copy of a CPU, each capable of executing tasks independently. It is not a unit for measuring temperature, storage unit for cache, or a unit for measuring speed.

Multiple Choice

How does having multiple cores affect a CPU's performance?

• Allows running multiple programs at the same time

• Reduces the overall speed

• Decreases the need for memory

• Eliminates the need for cache

Explanation Slide...

Having multiple cores allows running multiple programs at the same time, thus improving CPU performance.

Multiple Choice

What is the main limitation of increasing cache size inside the CPU?

• It makes the CPU too expensive

• It is limited by the CPU's design

• It can overheat the CPU

• It can slow down the CPU

Multiple Choice

What does the control unit do in relation to the CPU's clock?

• It cools down the CPU

• It decreases the clock speed

• It controls the whole cycle

• It increases the clock speed

Multiple Choice

Why is it beneficial to offload tasks to specialized processors?

• To increase the cache size

• To improve the main CPU's performance

• To make the computer lighter

• To save on electricity

Multiple Choice

What is a chip multi-processor?

• A type of cache

• A single-core CPU

• A specialized graphics processor

• A CPU with multiple cores embedded into a single physical chip

Multiple Choice

Why might having more CPU cores not always lead to better performance for certain programs?

• Because it increases the CPU's temperature

• Because it makes the CPU consume more power

• Because it reduces the cache size

• Because many programs are not designed to use multiple cores

Multiple Choice

What is the effect of weather conditions on a racing car's speed used to illustrate?

• The importance of cooling systems in CPUs

• The variability of CPU performance

• The need for specialized processors

• The role of external factors in CPU design

Multiple Choice

What does the size of the cache inside a CPU affect?

• The CPU's temperature

• The color of the CPU

• The CPU's weight

• The efficiency of the CPU

Multiple Choice

What is the main limitation of increasing cache size inside the CPU?

• It makes the CPU too expensive

• It is limited by the CPU's design

• It can overheat the CPU

• It can slow down the CPU

Multiple Choice

What is the main reason for keeping a copy of instructions and data in the cache?

• To make the CPU easier to manufacture

• To increase the CPU's power consumption

• To avoid fetching them from memory as much as possible

• To make the CPU look more complex

Multiple Choice

What is the significance of a CPU's clock speed?

• It measures the CPU's weight

• It determines how fast instructions can be executed

• It indicates the size of the CPU

• It determines the color of the CPU

Explanation Slide...

Having more CPU cores may not always lead to better performance for certain programs because many programs are not designed to use multiple cores.

Multiple Choice

What is pipelining in computer science?

• A technique that allows multiple instructions to be executed simultaneously by dividing them into larger stages and processing them in parallel.

• A technique that allows multiple instructions to be executed randomly by processing them in any order.

• A technique that allows multiple instructions to be executed sequentially by processing them one after another.

• A technique that allows multiple instructions to be executed simultaneously by dividing them into smaller stages and processing them in parallel.

Multiple Choice

What are the advantages of pipelining?

• Improved performance, reduced execution time, increased throughput, better resource utilisation

• Increased complexity, higher cost, more resource consumption, reduced efficiency

• No impact on performance, execution time, throughput, or resource utilisation

• Decreased performance, longer execution time, decreased throughput, worse resource utilisation

Multiple Choice

What are the stages involved in the pipelining process?

• instruction fetch, instruction decode, execution, memory access

• instruction fetch, instruction decode, execution, memory access, write back

• instruction fetch, instruction decode, execution, memory access, and write back

• instruction fetch, instruction decode, execution, memory access, write back

Multiple Choice

Explain the concept of data hazards in pipelining.

• Data hazards occur when there is a mismatch in the instruction set architecture.

• Data hazards occur when there is a delay in executing instructions.

• Data hazards occur when there is a dependency between instructions that causes a conflict in accessing or modifying data.

• Data hazards occur when there is a hardware malfunction in the pipeline.

Multiple Choice

What is instruction-level parallelism?

• Ability of a processor to execute multiple instructions sequentially

• Ability of a processor to execute multiple instructions simultaneously

• Ability of a processor to execute one instruction at a time

• Ability of a processor to execute instructions in a random order

Multiple Choice

How does pipelining improve the performance of a processor?

• By allowing multiple instructions to be executed simultaneously and overlapping the execution of different stages of instructions.

• By limiting the number of instructions that can be executed at a time.

• By increasing the number of clock cycles required for each instruction.

• By reducing the clock speed of the processor.

Multiple Choice

What is the difference between pipelining and parallel processing?

• Pipelining is the overlap of instruction execution, while parallel processing is the simultaneous execution of multiple tasks.

• Pipelining is the same as parallel processing.

• Pipelining is the execution of multiple tasks simultaneously.

• Parallel processing is the overlap of instruction execution.

Multiple Choice

What does the size of the cache inside a CPU affect?

• The CPU's temperature

• The color of the CPU

• The CPU's weight

• The efficiency of the CPU

Multiple Choice

What are the potential challenges or limitations of pipelining?

• Data dependencies, branch instructions, and resource contention.

• Data hazards, instruction hazards, and control hazards.

• Parallelism, cache size, and instruction level parallelism.

• Memory access, clock speed, and instruction set.

Multiple Choice

How can pipelining be implemented in a CPU architecture?

• By executing instructions sequentially without any parallelism.

• By increasing the clock speed of the CPU.

• By reducing the number of stages in the instruction execution process.

• By breaking down the execution of instructions into multiple stages and allowing each stage to work on a different instruction simultaneously.

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Performance of CPU and pipelining