NDLI: Dynamic task migration in home-based software DSM systems

Content Provider	IEEE Xplore Digital Library
Author	Weisong Shi Weiwu Hu Zhimin Tang Eskicioglu, M.R.
Copyright Year	1999
Description	Author affiliation: Inst. of Comput. Technol., Acad. Sinica, Beijing, China (Weisong Shi)
Abstract	Dynamic task migration is an effective strategy to maximize the performance and resource utilization in metacomputing environments. Traditionally, however, a "task" means only the corresponding code of computation, i.e., the data related to this computation is usually neglected. As such, when one task is migrated from processor A to processor B, the data required by this task remains on processor A. Thus, the processor B has to perform remote communication when it executes this task, eliminating the advantage of task migration, or even further degrading the performance. Hence, the definition of the traditional "task" should be revisited. We define a task as follows: Task=Computation subtask+Data subtask. Computation subtask is the program code to be executed, while the data subtask is the operations to access the related data located in memory. In fact, as the speed gap between processors and memory becomes larger and larger, the importance of data subtask becomes more obvious than before. Therefore, we argue that both subtasks should be migrated to a new processor during task migration. Based on this observation, we propose a dynamic loop-level task migration scheme. This scheme is implemented within the context of the JIAJIA software DSM system (W. Ha et al., 1999). The evaluation results show that the task migration scheme improves the performance of our benchmark applications by 36% to 50% compared with static task allocation schemes. As a result, the new scheme performs an average of 30% better than other computation-only migration schemes.
Starting Page	339
Ending Page	340
File Size	215166
Page Count	2
File Format	PDF
ISBN	0780356810
ISSN	10828907
DOI	10.1109/HPDC.1999.805317
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1999-08-06
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Software systems Access protocols Computers Content addressable storage Resource management Degradation Context-aware services Application software Random variables Electronic mail
Content Type	Text
Resource Type	Article

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