 |
English
|
正體中文
|
简体中文
|
Post-Print筆數 : 27 |
Items with full text/Total items : 109952/140887 (78%)
Visitors : 46291133
Online Users : 1463
|
|
|
Loading...
|
Please use this identifier to cite or link to this item:
https://nccur.lib.nccu.edu.tw/handle/140.119/72835
|
| Title: | Fewer Monitors and More Efficient Controllability for Deadlock Control in S3PGR2 (Systems of Simple Sequential Processes with General Resource Requirements) |
| Authors: | 趙玉
Chao, Daniel Yuh |
| Contributors: | 資管系 |
| Keywords: | Petri nets;siphons;resource allocation systems;deadlock;control |
| Date: | 2010-12 |
| Issue Date: | 2015-01-12 15:33:43 (UTC+8) |
| Abstract: | Concurrent systems such as distributed operating systems, distributed database systems, flexible manufacturing systems (FMS) etc. employ multiple processors to speed up the execution. However, to fully utilize the resources involved, the competition for resources among processes is strong and often leads to deadlocks where the whole system completely stops. Petri nets have been widely used to model concurrent systems and the associated deadlocks, which arise due to insufficiently marked siphons. A siphon is a structure object or a set of places; once these places become unmarked, they stay so afterwards making their output transitions permanently dead. To avoid deadlocks, monitors and control arcs are added upon problematic siphons, the number of which grows exponentially with the size of the net modeling the FMS. Li and Zhou relieved the problem by adding monitors only to elementary siphons. First, they test the marking linear inequality (MLI). If it fails, then they perform a linear integer programming test which takes exponential time. Thus, the MLI test is only a sufficient (not necessary) one. For systems of simple sequential processes with general resource requirements, there is one additional problem. That is, even though a siphon is not a dependent siphon based on the definition by Li and Zhou, the siphon may become controlled after controlling some elementary siphons. We develop new theory to turn this elementary siphon into a dependent one, thus reducing the number of monitors and simplifying the control hardware. This makes the uncontrolled model less disturbed and hence the controlled system becomes more permissive. Furthermore, we derive the exact controllability (both sufficient and necessary) so that the subsequent integer programming test can be eliminated. As a result, the total time complexity to check controllability of all strongly dependent siphons is reduced from exponential to linear if all n=2 strongly dependent siphons need to be verified against our new MLI test, the number of which is polynomial. |
| Relation: | Computer Journal,53(10),1783-1798 |
| Data Type: | article |
| DOI 連結: | http://dx.doi.org/10.1093/comjnl/bxq007 |
| DOI: | 10.1093/comjnl/bxq007 |
| Appears in Collections: | [資訊管理學系] 期刊論文
|
Files in This Item:
| File |
Description |
Size | Format | |
|---|
| index.html | | 0Kb | HTML2 | 1193 | View/Open |
|
All items in 政大典藏 are protected by copyright, with all rights reserved.
|
著作權政策宣告 Copyright Announcement1.本網站之數位內容為國立政治大學所收錄之機構典藏，無償提供學術研究與公眾教育等公益性使用，惟仍請適度，合理使用本網站之內容，以尊重著作權人之權益。商業上之利用，則請先取得著作權人之授權。
The digital content of this website is part of National Chengchi University Institutional Repository. It provides free access to academic research and public education for non-commercial use. Please utilize it in a proper and reasonable manner and respect the rights of copyright owners. For commercial use, please obtain authorization from the copyright owner in advance.
2.本網站之製作，已盡力防止侵害著作權人之權益，如仍發現本網站之數位內容有侵害著作權人權益情事者，請權利人通知本網站維護人員(
nccur@nccu.edu.tw)，維護人員將立即採取移除該數位著作等補救措施。
NCCU Institutional Repository is made to protect the interests of copyright owners. If you believe that any material on the website infringes copyright, please contact our staff(
nccur@nccu.edu.tw). We will remove the work from the repository and investigate your claim.
