Consider an environment in which there is a one-to-one mapping between user-level threads and kernel-level threads that allows one or more threads within a process to issue blocking system calls while other threads continue to run. Explain why this model can make multithreaded programs run faster than their single-threaded coun- terparts on a uniprocessor computer. LEWI96-42

Consider an environment in which there is a one-to-one mapping between user-level threads and kernel-level threads that allows one or more threads within a process to issue blocking system calls while other threads continue to run. Explain why this model can make multithreaded programs run faster than their single-threaded coun- terparts on a uniprocessor computer. LEWI96-42

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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In certain instances, user-level threads may be preferable than kernel-level threads. How do user-level and kernel-level threads differ? Does one species do better than the others in a particular scenario?
Suppose that when run using a single thread, a particular program spends 20 seconds executing code that cannot be parallelized, and 280 seconds executing code that is highly parallelizable. Using Amdahl’s law, give an upper bound on the speedup (ratio of old to new execution time) that might be achieved for this program by exploiting parallel execution on a highly-parallel computer with thousands of processors/cores.
Assume that an operating system maps user-level threads to the kernel using the many-to-many model and that the mapping is done through LWPs (light-weight processes). Furthermore, the system allows developers to create real-time threads for use in real-time systems. Is it necessary to bind a real-time thread to an LWP (light-weight process)? Explain.
A system provides support for user-level and kernel-level threads. The mapping in this system is one to one (there is a corresponding kernel thread for each user thread). Does a multithreaded process consist of (a) a working set for the entire process or (b) a working set for each thread? Explain.
Is it preferable to employ threads at the user level as opposed to threads at the kernel level? What is it that differentiates threads running at the user level from those running at the kernel level? Is there ever a scenario in which one variety surpasses the others in terms of quality?
LWPs are used to convert kernel-level threads to user-level threads in an operating system, and the many-to-many paradigm is applied (light-weight processes). Real-time threads may also be designed by developers for usage in real-time systems. Rather of a LWP, a real-time thread should be attached to a lightweight process. Explain.
Let's assume that LWPs are used to translate kernel-level threads to user-level threads in an operating system, and that the many-to-many paradigm is used (light-weight processes). Developers may also design real-time threads that can be used in real-time systems. Should a real-time thread be tied to a lightweight process rather than a LWP? Explain.
can you explain to me the releationship or dependencies between the PID, Threads, Status, CPU Time and memory of the screenshot below? I already know what those are and its meaning, but the relationship between them, i do not know.
Is there a circumstance where user-level threads are superior over kernel-level threads? What are the differences between user-level and kernel-level threads? Is there a circumstance in which one kind is better than the rest?
Is it more efficient to employ threads that operate at the user level as opposed to those that operate at the kernel level? What sets apart threads that run on the user level from those that run on the kernel level? Is there ever a point in time when one kind is more advantageous than another?
Exists a scenario where user-level threads outperform kernel-level threads? What distinguishes user-level threads from kernel-level threads? Are some individuals better adapted to certain conditions than others?
can you explain to me the relationship or dependencies between the PID, Threads, Status, CPU Time, and memory of the screenshot below? I already know what those are and their meaning and i dont need the meaning anymore, but I need the relationship between them, I do not know. For example. if not for the memory, then the process wont be able to run. Or without knowing the memory, we wont know about the threads active