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Is Work Stealing always the most appropriate user-level thread scheduling algorithm?


Is Work Stealing always the most appropriate user-level thread scheduling algorithm?

By : tdstein
Date : November 22 2020, 07:01 PM
To fix the issue you can do I'd distribute the tasks upfront. With the information of their estimated running time you can distribute them into individual queues, for each thread one.
Distributing the tasks is basically the knapsack problem, each queue should take the same amount of time.
code :


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Three Level Scheduling Thread Implementation

Three Level Scheduling Thread Implementation


By : Tobias
Date : March 29 2020, 07:55 AM
Any of those help Inside the kernel - any thread or process - is interrupted by a typical timer input or interruption during I/O call. This brings transfer of control back to kernel's scheduler.
Switching thread is done by scheduler which decides which thread is next runable.
work stealing algorithm

work stealing algorithm


By : Jamie Randall
Date : March 29 2020, 07:55 AM
like below fixes the issue Are any of these helpful?
Work-Stealing in .NET 4.0
Java Concurrent API Work-Stealing Algorithm

Java Concurrent API Work-Stealing Algorithm


By : tdst
Date : March 29 2020, 07:55 AM
it should still fix some issue What is Java concurrent API's Work-Stealing algorithm? ,
What is Java concurrent API's Work-Stealing algorithm?
Why Shortest Job First(SJF) algorithm is not used instead of FCFS at final level in Multilevel Feedback Scheduling

Why Shortest Job First(SJF) algorithm is not used instead of FCFS at final level in Multilevel Feedback Scheduling


By : vidhee savani
Date : March 29 2020, 07:55 AM
may help you . One simple reason:
The processes fall in the base level queue after they fail to finish in the time quantum alloted to them in the higher level queues. If you implement SJF algorithm in the base level queue, you may starve a process because shorter job may keep coming before a longer executing process ever gets the CPU.
pthread.h - Is voluntary CPU yield the only trigger to scheduling another user-level thread?

pthread.h - Is voluntary CPU yield the only trigger to scheduling another user-level thread?


By : user1756394
Date : March 29 2020, 07:55 AM
like below fixes the issue No, any call that also blocks the current thread will schedule another tread. This includes library calls such as sleep(), read(), select(), pthread_mutex_lock() and many others.
Note that pthread is not a pure user level thread implementation on linux, it maps 1 user mode thread to 1 kernel task.
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