Robustness results concerning EDF scheduling upon uniform multiprocessors

نویسنده

  • Sanjoy K. Baruah
چکیده

Each processor in a uniform multiprocessor machine is characterized by a speed or computing capacity, with the interpretation that a job executing on a processor with speed s for t time units completes ðs tÞ units of execution. The earliestdeadline-first (EDF) scheduling of hard-real-time systems upon uniform multiprocessor machines is considered. It is known that online algorithms tend to perform very poorly in scheduling such hard-real-time systems on multiprocessors; resource-augmentation techniques are presented here that permit online algorithms in general (EDF in particular) to perform better than may be expected given these inherent limitations. It is shown that EDF scheduling upon uniform multiprocessors is robust with respect to both job execution requirements and processor computing capacity.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Characteristics of EDF Schedulability on Uniform Multiprocessors

In uniform multiprocessor platforms, the various processors comprising the multiprocessor platform may have different computing capacities. The focus of this paper is the design of efficient tests for determining whether the Earliest Deadline First Scheduling Algorithm (EDF) can successfully schedule a given real-time task system to meet all deadlines upon a specified uniform multiprocessor pla...

متن کامل

Towards Compositional Hierarchical Scheduling Frameworks on Uniform Multiprocessors

In this report, we approach the problem of defining and analysing compositional hierarchical scheduling frameworks (HSF) upon uniform multiprocessor platforms. For this we propose the uniform multiprocessor periodic resource (UMPR) model for a component interface. We extend previous results (for dedicated uniform multiprocessors, and for compositional HSFs on identical multiprocessors), providi...

متن کامل

Modifying EDF for Uniform Multiprocessors

Scheduling real-time systems on multiprocessors introduces complexities that do not arise when using uniprocessors. If the processors do not all operate at the same speed, scheduling becomes even more complex. When scheduling using EDF on multiprocessors, breaking deadline ties in different ways can change the resulting schedule dramatically. We consider methods to resolve the ambiguities in ED...

متن کامل

Restricting EDF migration on uniform multiprocessors

Restricted migration of periodic and sporadic tasks on uniform multiprocessors is considered. On multiprocessors, job migration can cause a prohibitively high overhead — particularly in real-time systems where accurate timing is essential. However, if periodic tasks do not maintain state between separate invocations, different jobs of the same task may be allowed to execute on different process...

متن کامل

A New Task Model and Utilization Bound for Uniform Multiprocessors

This paper introduces a new model for describing jobs and tasks for real-time systems. Using this model can improve utilization bounds on uniform multiprocessors, in which each processor has an associated speed. Traditionally, a job executing on a processor of speed s for t units of time will perform s × t units of work. However, this uniform scaling only occurs if tasks are completely CPU boun...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:
  • IEEE Trans. Computers

دوره 52  شماره 

صفحات  -

تاریخ انتشار 2002