Pub Date : 1989-06-05DOI: 10.1109/ICDCS.1989.37960
K. Efe, B. Groselj
Two algorithms are developed for minimizing control overheads in exchanging state information arising from the control messages used in determining the load levels at other servers. In the first algorithm, the load levels at other servers are guessed using a simple heuristic algorithm. Such a model is found to provide significant improvements compared to the no-load sharing case. The second algorithm improves upon the first one by replacing some unnecessary task transfers by a single probe. The simulation results obtained from these algorithms are presented and compared to an algorithm based on random selection of destinations for transfer tasks. It was concluded that a load sharing policy should try to maximize the success rate in finding good destinations for transfer tasks while minimizing the control overheads.<>
{"title":"Minimizing control overheads in adaptive load sharing","authors":"K. Efe, B. Groselj","doi":"10.1109/ICDCS.1989.37960","DOIUrl":"https://doi.org/10.1109/ICDCS.1989.37960","url":null,"abstract":"Two algorithms are developed for minimizing control overheads in exchanging state information arising from the control messages used in determining the load levels at other servers. In the first algorithm, the load levels at other servers are guessed using a simple heuristic algorithm. Such a model is found to provide significant improvements compared to the no-load sharing case. The second algorithm improves upon the first one by replacing some unnecessary task transfers by a single probe. The simulation results obtained from these algorithms are presented and compared to an algorithm based on random selection of destinations for transfer tasks. It was concluded that a load sharing policy should try to maximize the success rate in finding good destinations for transfer tasks while minimizing the control overheads.<<ETX>>","PeriodicalId":266544,"journal":{"name":"[1989] Proceedings. The 9th International Conference on Distributed Computing Systems","volume":"309 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133556141","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1989-06-05DOI: 10.1109/ICDCS.1989.37954
K. Efe
A network is proposed that preserves all of the properties of the hypercube, but has a diameter which is only about half of that of the hypercube. This network is self-routing, in the sense that there is a simple distributed routing algorithm which guarantees optimal paths between any pair of vertices. This fact, together with other properties such as regularity, symmetry, high connectivity, and a simple recursive structure, implies that the multiply twisted cube is an alternative to the ordinary hypercube for massively parallel architectures. Single-input multiple-data stream algorithm were developed which utilize the new architecture. The multiply-twisted hypercube architecture can be used to profitably emulate the ordinary hypercube. Some of the basic properties of this network are discussed, the programming issues are emphasized, and it is shown that any hypercube algorithm can be mapped to run on the new architecture. In many cases this mapping results in a substantial reduction in the running time due to more efficient routing of data between processors.<>
{"title":"Programming the twisted-cube architectures","authors":"K. Efe","doi":"10.1109/ICDCS.1989.37954","DOIUrl":"https://doi.org/10.1109/ICDCS.1989.37954","url":null,"abstract":"A network is proposed that preserves all of the properties of the hypercube, but has a diameter which is only about half of that of the hypercube. This network is self-routing, in the sense that there is a simple distributed routing algorithm which guarantees optimal paths between any pair of vertices. This fact, together with other properties such as regularity, symmetry, high connectivity, and a simple recursive structure, implies that the multiply twisted cube is an alternative to the ordinary hypercube for massively parallel architectures. Single-input multiple-data stream algorithm were developed which utilize the new architecture. The multiply-twisted hypercube architecture can be used to profitably emulate the ordinary hypercube. Some of the basic properties of this network are discussed, the programming issues are emphasized, and it is shown that any hypercube algorithm can be mapped to run on the new architecture. In many cases this mapping results in a substantial reduction in the running time due to more efficient routing of data between processors.<<ETX>>","PeriodicalId":266544,"journal":{"name":"[1989] Proceedings. The 9th International Conference on Distributed Computing Systems","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124685971","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1989-06-05DOI: 10.1109/ICDCS.1989.37964
Craig A. Lee, L. Bic
The binary predicate execution model (BPEM) is a computational model that combines logic programming, semantic nets, and message-driven computation into a paradigm for the construction of highly parallel knowledge-base systems. Simulation results are presented that demonstrate the ability of BPM to exploit effectively the resources of a loosely coupled computer network consisting of large numbers of independent processing elements. These simulations suggest performance on the order of 10/sup 5/ logical inferences per second for 256 processing elements in an n-cube configuration. A very important feature of the BPEM is that it scales-up linearly under simple OR-parallelism and AND-parallelism. Hence, the BPEM can scale-up to exploit parallelism efficiently in very large semantic networks and knowledge bases.<>
{"title":"Performance of a decentralized knowledge base system","authors":"Craig A. Lee, L. Bic","doi":"10.1109/ICDCS.1989.37964","DOIUrl":"https://doi.org/10.1109/ICDCS.1989.37964","url":null,"abstract":"The binary predicate execution model (BPEM) is a computational model that combines logic programming, semantic nets, and message-driven computation into a paradigm for the construction of highly parallel knowledge-base systems. Simulation results are presented that demonstrate the ability of BPM to exploit effectively the resources of a loosely coupled computer network consisting of large numbers of independent processing elements. These simulations suggest performance on the order of 10/sup 5/ logical inferences per second for 256 processing elements in an n-cube configuration. A very important feature of the BPEM is that it scales-up linearly under simple OR-parallelism and AND-parallelism. Hence, the BPEM can scale-up to exploit parallelism efficiently in very large semantic networks and knowledge bases.<<ETX>>","PeriodicalId":266544,"journal":{"name":"[1989] Proceedings. The 9th International Conference on Distributed Computing Systems","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124880534","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1989-06-05DOI: 10.1109/ICDCS.1989.37980
L. Kleinrock, Willard Korfhage
Distributed systems having large numbers of idle computers and workstations are analyzed using a very simple model of a distributed program (a fixed amount of work) to see how the use of transient processors affects the program's service time. The probability density of the length of time it takes to finish a fixed amount of work is determined. An equation is given for the main result for an M-processor network. Simulations confirm that Brownian motion with drift is an accurate model of system performance. With large programs that run for a long time relative to the length of available and nonavailable periods, the central limit-theorem applies, and the Brownian-motion-with-drift model remains good regardless of the distributions of the available and the nonavailable periods. Under these assumptions, the distribution of finishing time is very tight about its mean and well approximated by a normal distribution.<>
{"title":"Collecting unused processing capacity: an analysis of transient distributed systems","authors":"L. Kleinrock, Willard Korfhage","doi":"10.1109/ICDCS.1989.37980","DOIUrl":"https://doi.org/10.1109/ICDCS.1989.37980","url":null,"abstract":"Distributed systems having large numbers of idle computers and workstations are analyzed using a very simple model of a distributed program (a fixed amount of work) to see how the use of transient processors affects the program's service time. The probability density of the length of time it takes to finish a fixed amount of work is determined. An equation is given for the main result for an M-processor network. Simulations confirm that Brownian motion with drift is an accurate model of system performance. With large programs that run for a long time relative to the length of available and nonavailable periods, the central limit-theorem applies, and the Brownian-motion-with-drift model remains good regardless of the distributions of the available and the nonavailable periods. Under these assumptions, the distribution of finishing time is very tight about its mean and well approximated by a normal distribution.<<ETX>>","PeriodicalId":266544,"journal":{"name":"[1989] Proceedings. The 9th International Conference on Distributed Computing Systems","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133423775","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1989-06-05DOI: 10.1109/ICDCS.1989.37956
G. Roman, H. C. Cunningham
A language paradigm called shared dataspace is defined that causes computations to be performed using an anonymous, content-addressable communication medium acted upon by atomic transactions. To probe the essence of this paradigm, a relatively simple shared dataspace language called Swarm is defined. An overview is presented of the Swarm language. A formal operational model for the language is given and some of the programming implications and distinctive features of the model and language are discussed. Swarm programming strategies are examined using a series of related example programs.<>
{"title":"A shared dataspace model of concurrency-language and programming implications","authors":"G. Roman, H. C. Cunningham","doi":"10.1109/ICDCS.1989.37956","DOIUrl":"https://doi.org/10.1109/ICDCS.1989.37956","url":null,"abstract":"A language paradigm called shared dataspace is defined that causes computations to be performed using an anonymous, content-addressable communication medium acted upon by atomic transactions. To probe the essence of this paradigm, a relatively simple shared dataspace language called Swarm is defined. An overview is presented of the Swarm language. A formal operational model for the language is given and some of the programming implications and distinctive features of the model and language are discussed. Swarm programming strategies are examined using a series of related example programs.<<ETX>>","PeriodicalId":266544,"journal":{"name":"[1989] Proceedings. The 9th International Conference on Distributed Computing Systems","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132709044","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1989-06-05DOI: 10.1109/ICDCS.1989.37926
R. V. Renesse, A. Tanenbaum, A. N. Wilschut
The Bullet server is a file server that outperforms traditional file servers by more than a factor of three. It achieves high throughput and low delay by a software design radically different from that of file servers currently in use. Whereas files are normally stored as a sequence of disk blocks, each Bullet server file is stored contiguously, both on disk and in the server's random access memory cache. Furthermore, it uses the concept of an immutable file to improve performance, to enable caching, and to provide a clean semantic model to the user. The authors describe the design and implementation of the Bullet server in detail, present measurements of its performance, and compare this performance to that of the SUN file server running on the same hardware.<>
{"title":"The design of a high-performance file server","authors":"R. V. Renesse, A. Tanenbaum, A. N. Wilschut","doi":"10.1109/ICDCS.1989.37926","DOIUrl":"https://doi.org/10.1109/ICDCS.1989.37926","url":null,"abstract":"The Bullet server is a file server that outperforms traditional file servers by more than a factor of three. It achieves high throughput and low delay by a software design radically different from that of file servers currently in use. Whereas files are normally stored as a sequence of disk blocks, each Bullet server file is stored contiguously, both on disk and in the server's random access memory cache. Furthermore, it uses the concept of an immutable file to improve performance, to enable caching, and to provide a clean semantic model to the user. The authors describe the design and implementation of the Bullet server in detail, present measurements of its performance, and compare this performance to that of the SUN file server running on the same hardware.<<ETX>>","PeriodicalId":266544,"journal":{"name":"[1989] Proceedings. The 9th International Conference on Distributed Computing Systems","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114988869","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1989-06-05DOI: 10.1109/ICDCS.1989.37938
Nasr E. Belkeir, M. Ahamad
Heuristics for constructing low-cost multicast spanning trees in a dynamic environment are investigated. Two heuristic algorithms are developed that update the multicast tree incrementally as the membership changes and reduce the total bandwidth required for sending data and control messages. The broadcast tree based algorithm makes use of a tree structure in the network, and the other algorithm joins a new member to the node that is nearest to it and is already in the multicast tree. A simulation model is used to study the performance of the algorithms and to compare them with the best-known heuristic algorithm developed by D.W. Wall (1980) which computes the multicast tree structure for a given membership of the group.<>
{"title":"Low cost algorithms for message delivery in dynamic multicast groups","authors":"Nasr E. Belkeir, M. Ahamad","doi":"10.1109/ICDCS.1989.37938","DOIUrl":"https://doi.org/10.1109/ICDCS.1989.37938","url":null,"abstract":"Heuristics for constructing low-cost multicast spanning trees in a dynamic environment are investigated. Two heuristic algorithms are developed that update the multicast tree incrementally as the membership changes and reduce the total bandwidth required for sending data and control messages. The broadcast tree based algorithm makes use of a tree structure in the network, and the other algorithm joins a new member to the node that is nearest to it and is already in the multicast tree. A simulation model is used to study the performance of the algorithms and to compare them with the best-known heuristic algorithm developed by D.W. Wall (1980) which computes the multicast tree structure for a given membership of the group.<<ETX>>","PeriodicalId":266544,"journal":{"name":"[1989] Proceedings. The 9th International Conference on Distributed Computing Systems","volume":"183 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114828882","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1989-06-05DOI: 10.1109/ICDCS.1989.37928
S. Chung, Ed Lazowska, D. Notkin, J. Zahorjan
The authors take efficient kernel-level support as a given, and study the performance implications of design alternatives one level up-in the stubs, which insulate the client and server from details about network communication. These alternatives represent a collection of approaches to achieving standard remote procedure call of semantics. Consideration is given to the performance implications of compiled vs. interpreted stubs, procedural vs. inline code for moving data to/from packet buffers, block copy vs. individual data item copy moving data to/from packet buffers, and the presence or absence of byte swapping.<>
{"title":"Performance implications of design alternatives for remote procedure call stubs","authors":"S. Chung, Ed Lazowska, D. Notkin, J. Zahorjan","doi":"10.1109/ICDCS.1989.37928","DOIUrl":"https://doi.org/10.1109/ICDCS.1989.37928","url":null,"abstract":"The authors take efficient kernel-level support as a given, and study the performance implications of design alternatives one level up-in the stubs, which insulate the client and server from details about network communication. These alternatives represent a collection of approaches to achieving standard remote procedure call of semantics. Consideration is given to the performance implications of compiled vs. interpreted stubs, procedural vs. inline code for moving data to/from packet buffers, block copy vs. individual data item copy moving data to/from packet buffers, and the presence or absence of byte swapping.<<ETX>>","PeriodicalId":266544,"journal":{"name":"[1989] Proceedings. The 9th International Conference on Distributed Computing Systems","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125460546","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1989-06-05DOI: 10.1109/ICDCS.1989.37985
B. Jain, R. Mittal, R. Patney
An augmented binary (AB) tree architecture is proposed with a view to providing fault tolerance. This architecture is an augmentation of an n-level full binary tree with n redundant nodes and 2/sup n/+3n-6 redundant links. The AB tree can be configured into a full binary tree even when one node is faulty at each level. While functionally equivalent to the RAE-tree, the proposed AB tree has a regular topology, reduced number of maximum input-output channels per processor, and fewer wire crossovers when implemented using very large-scale integration layout. A reconfiguration algorithm, which constructs an n-level full binary tree from an n-level faulty AB tree, is given. A distributed fault diagnosis algorithm is given which runs concurrently on each nonfaulty processor, enabling each nonfaulty processor to identify all faulty processors.<>
{"title":"Fault-tolerant analysis and algorithms for a proposed augmented binary tree architecture","authors":"B. Jain, R. Mittal, R. Patney","doi":"10.1109/ICDCS.1989.37985","DOIUrl":"https://doi.org/10.1109/ICDCS.1989.37985","url":null,"abstract":"An augmented binary (AB) tree architecture is proposed with a view to providing fault tolerance. This architecture is an augmentation of an n-level full binary tree with n redundant nodes and 2/sup n/+3n-6 redundant links. The AB tree can be configured into a full binary tree even when one node is faulty at each level. While functionally equivalent to the RAE-tree, the proposed AB tree has a regular topology, reduced number of maximum input-output channels per processor, and fewer wire crossovers when implemented using very large-scale integration layout. A reconfiguration algorithm, which constructs an n-level full binary tree from an n-level faulty AB tree, is given. A distributed fault diagnosis algorithm is given which runs concurrently on each nonfaulty processor, enabling each nonfaulty processor to identify all faulty processors.<<ETX>>","PeriodicalId":266544,"journal":{"name":"[1989] Proceedings. The 9th International Conference on Distributed Computing Systems","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128315143","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1989-06-05DOI: 10.1109/ICDCS.1989.37970
Jehan-Francois Pâris
A voting protocol overcoming the usual requirements of a minimum number of three copies to be of any practical use and relatively high number of read and write requests is presented. It provides a significant amount of fault-tolerance with as few as two replicas. This protocol, voting with bystanders (VWB), applies to all networks consisting of local area network segments that are immune to partial failures linked by gateways that might fail. A stochastic analysis of the protocol under general Markovian assumptions is presented showing that VWB provides excellent read availabilities and good write availabilities with as few as two or three replicas.<>
{"title":"Voting with bystanders","authors":"Jehan-Francois Pâris","doi":"10.1109/ICDCS.1989.37970","DOIUrl":"https://doi.org/10.1109/ICDCS.1989.37970","url":null,"abstract":"A voting protocol overcoming the usual requirements of a minimum number of three copies to be of any practical use and relatively high number of read and write requests is presented. It provides a significant amount of fault-tolerance with as few as two replicas. This protocol, voting with bystanders (VWB), applies to all networks consisting of local area network segments that are immune to partial failures linked by gateways that might fail. A stochastic analysis of the protocol under general Markovian assumptions is presented showing that VWB provides excellent read availabilities and good write availabilities with as few as two or three replicas.<<ETX>>","PeriodicalId":266544,"journal":{"name":"[1989] Proceedings. The 9th International Conference on Distributed Computing Systems","volume":"93 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126880461","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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