Multiprocessor Scheduling

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Access provided by: anon Sign Out. Heterogeneous multiprocessor scheduling and allocation using evolutionary algorithms Abstract: We propose a novel stochastic approach for the problem of multiprocessor scheduling and allocation under timing and resource constraints using an evolutionary algorithm EA. Enroll for Free. From the lesson. Taught By. Vivek Sarkar Professor.

Multiprocessor Scheduling

Try the Course for Free. Explore our Catalog Join for free and get personalized recommendations, updates and offers. Whenever the task balancer runs at specific intervals of kernel-time to balance tasks between two domains of CPUs, it transfers tasks from the heavily loaded one to the less loaded one. It could execute one the heavily loaded processor, less loaded processor, or both depending on its implementation. It takes tasks from heavily-loaded processors and assigns them to a idle or less-loaded processor in the system.

It will access the task queues it can also take sleeping tasks of both processors.

Multiprocessor Scheduling in Operating System

For lock-less multiprocessor schedulers, the interrupts should be turned off unless already in an interrupt context, where the next interrupt is queued until the IRET executes while accessing the run-queue for any operation like adding or removing tasks from it. If a thread is jumping between CPUs each time it is run, it never gets chance to fill either CPU's cache with code or data: it might run for a moment, and load some instructions from main memory, then get preempted.

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Next time it is scheduled, it might be running on a different CPU, where it would need to load the cache all over again. If the scheduler can assign each thread its own favourite CPU, it can help increase cache performance. Of course, if two threads with the same favourite CPU want to run at the same time on a dual processor system, one of them will have to take the 'wrong' CPU.

System V iirc had a nice synchronization tool a sort of smart spinlock for multiprocessors that allowed a thread to busy-wait for a resource as long as the resource holder was active on another CPU and to enter the SLEEP state when the holder wasn't running.

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This has been proved in papers which i lost the references that this method pays and leads to better performances than always entering the SLEEP state when a resource was busy. One simple way of multiprocessor scheduling is to assign each CPU it's own scheduler.

Pre-emptive priority scheduling

Then when you load a thread it is assigned to a certain CPU. This deals with pinning, but you would have to keep the workloads balanced after thread termination. Jump to: navigation , search. Categories : Processes and Threads Stubs Synchronization.