Operating System Concepts: Amdahl's Law and Threads

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What is a key difference between user threads and kernel threads?

User threads are used for parallel processing, while kernel threads are used for serial processing.

User threads are created by the user, while kernel threads are created by the kernel.

User threads are managed by the kernel, while kernel threads are managed by the user-level threads library.

User threads are managed by the user-level threads library, while kernel threads are supported by the kernel. (correct)

Which multithreading model maps multiple user-level threads to a single kernel thread?

Many-to-Many

One-to-One

One-to-Many

Many-to-One (correct)

What is the primary advantage of the One-to-One multithreading model?

It is more efficient in terms of resource usage.

It allows for more concurrency than the Many-to-One model. (correct)

It is more scalable than the Many-to-Many model.

It is easier to implement than the Many-to-Many model.

What is the purpose of a thread library?

To provide an API for creating and managing threads. Signup and view all the answers

Which of the following is an example of a thread library?

Pthreads Signup and view all the answers

What is the primary advantage of implicit threading?

It is easier to implement than explicit threading. Signup and view all the answers

What is the primary limitation of the Many-to-One multithreading model?

One thread blocking causes all to block. Signup and view all the answers

What is the role of the kernel in kernel threads?

The kernel supports kernel threads. Signup and view all the answers

What is the primary benefit of Amdahl's Law?

It predicts the maximum theoretical speedup that can be achieved by parallel processing. Signup and view all the answers

Which of the following is an example of implicit threading?

All of the above Signup and view all the answers

What is the primary advantage of thread creation over process creation?

It is a lighter-weight operation Signup and view all the answers

What is the primary objective of thread cancellation?

To terminate a thread before it has finished Signup and view all the answers

What is a key benefit of using multiple threads in a single process?

Threads share resources of the process Signup and view all the answers

What determines when a thread cancellation occurs?

The thread's state Signup and view all the answers

What is a major challenge in programming multicore systems?

Dividing tasks into threads Signup and view all the answers

What is the term for a system that can perform multiple tasks simultaneously?

Parallelism Signup and view all the answers

What is the purpose of thread-local storage (TLS)?

To allow each thread to have its own copy of data Signup and view all the answers

What is the benefit of multithreading in terms of responsiveness?

Better user interface responsiveness Signup and view all the answers

What is the default type of cancellation in pthreads?

Deferred cancellation Signup and view all the answers

How is thread cancellation handled on Linux systems?

Through signals Signup and view all the answers

What is the primary difference between kernels and user-level threads?

Kernel threads are managed by the kernel Signup and view all the answers

What happens when a thread has cancellation disabled?

Cancellation remains pending until the thread enables it Signup and view all the answers