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Universal continuous routing strategies 96

Universal continuous routing strategies

引用

8th annual acm symposium on parallel algorithms and architectures

作者： Scheideler, C Vocking, B Univ Gesamthsch Paderborn Dept Math & Comp Sci D-33095 Paderborn Germany Univ Gesamthsch Paderborn Heinz Nixdorf Inst D-33095 Paderborn Germany

ISBN: (纸本)9780897918091

We analyze universal routing protocols, that is, protocols that can be used for any communication pattern in any network, under a stochastic model of continuous message generation, In particular, we present two universal protocols, a store-and-forward and a wormhole routing protocol, and characterize their performance by the following three parameters: the maximum message generation rate for which the protocol is stable, the expected delay of a message from generation to service, and the time the protocol needs to recover from worst-case scenarios. Both protocols yield significant performance improvements over all previously known continuous routing protocols. In addition, we present adaptations of our protocols to continuous routing in node-symmetric networks, butterflies, and meshes.

关键词： parallel processing systems

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Analyses of load stealing models based on differential equations 98

Analyses of load stealing models based on differential equat...

引用

Proceedings of the 1998 10th annual acm symposium on parallel algorithms and architectures, SPAA

作者： Mitzenmacher, M. Digital Systems Research Cent Palo Alto CA United States

ISBN: (纸本)9780897919890

In this paper we develop models for and analyze several randomized work stealing algorithms in a dynamic setting. Our models represent the limiting behavior of systems as the number of processors grows to infinity using differential equations. The advantages of this approach include the ability to model a large variety of systems and to provide accurate numerical approximations of system behavior even when the number of processors is relatively small. We show how this approach can yield significant intuition about the behavior of work stealing algorithms in realistic settings.

关键词： parallel processing systems

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Explicit multi-threading (XMT) bridging models for instruction parallelism *(extended abstract) 98

Explicit multi-threading (XMT) bridging models for instructi...

引用

Proceedings of the 1998 10th annual acm symposium on parallel algorithms and architectures, SPAA

作者： Vishkin, U. Dascal, Sh. Berkovich, E. Nuzman, J. Univ of Maryland and Tel-Aviv Univ

ISBN: (纸本)9780897919890

This paper envisions an extension to a standard instruction set which efficiently implements PRAM-style algorithms using explicit multi-threaded instruction-level parallelism (ILP);that is, Explicit Multi-Threading (XMT), a fine-grained computational paradigm covering the spectrum from algorithms through architecture to implementation is introduced;new elements are added where needed.

关键词： parallel algorithms

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Computational bounds for fundamental problems on general-purpose parallel models 98

Computational bounds for fundamental problems on general-pur...

引用

Proceedings of the 1998 10th annual acm symposium on parallel algorithms and architectures, SPAA

作者： MacKenzie, Ph.D. Ramachandran, V. Boise State Univ Boise ID United States

ISBN: (纸本)9780897919890

We present lower bounds for time needed to solve basic problems on three general-purpose models of parallel computation: the shared-memory models QSM and s-QSW, and the distributed-memory model, the BSP. For each of these models, we also obtain lower bounds for the number of rounds needed to solve these problems using a randomized algorithm on a p-processor machine. Our results on 'rounds' is of special interest in the context of designing work-efficient algorithms on a machine where latency and synchronization costs are high. Many of our lower bound results are complemented by upper bounds that match the lower bound or are close to it.

关键词： parallel processing systems

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Efficient disk allocation for fast similarity searching 98

Efficient disk allocation for fast similarity searching

引用

Proceedings of the 1998 10th annual acm symposium on parallel algorithms and architectures, SPAA

作者： Prabhakar, S. Agrawal, D. El Abbadi, A. Univ of California Santa Barbara CA United States

ISBN: (纸本)9780897919890

As databases increasingly integrate non-textual information it is becoming necessary to support efficient similarity searching in addition to range searching. Recently, declustering techniques have been proposed for improving the performance of similarity searches through parallel I/O. In this paper, we propose a new scheme which provides good declustering for similarity searching. In particular, it does global declustering as opposed to local declustering, exploits the availability of extra disks and does not limit the partitioning of the data space. Our technique is based upon the Cyclic declustering schemes which were developed for range and partial match queries. We establish, in general, that Cyclic declustering techniques outperform previously proposed techniques.

关键词： parallel algorithms

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Asynchronous parallel algorithm for mining association rules on a shared-memory multi-processors 98

Asynchronous parallel algorithm for mining association rules...

引用

Proceedings of the 1998 10th annual acm symposium on parallel algorithms and architectures, SPAA

作者： Cheung, D.W. Hu, K. Xia, Sh. The Univ of Hong Kong Hong Kong Hong Kong

ISBN: (纸本)9780897919890

Mining association rules from large databases is an important problem in data mining. There is a need to develop parallel algorithm for this problem because it is a very costly computation process. However, all proposed parallel algorithms for mining association rules follow the conventional level-wise approach. On a shared-memory multi-processors, they will impose a synchronization in every iteration which degrades greatly their performance. The deficiency comes from the contention on the shared I/O channel when all processors are accessing their database partitions in the shared storage synchronously. An asynchronous algorithm APM has been proposed for mining association rules on shared-memory multiprocessors. All participating processors in APM generate candidates and count their supports independently without synchronization. Furthermore, it can finish the computation with less I/O than required in the level-wise approach. The algorithm has been implemented on a Sun Enterprise 4000 multi-processors with 12 nodes. The experiments show that APM has super performance than other proposed synchronous algorithms.

关键词： parallel algorithms

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Analysis of first-come-first-serve parallel job scheduling

Analysis of first-come-first-serve parallel job scheduling

引用

Proceedings of the 1998 9th annual acm SIAM symposium on Discrete algorithms

作者： Schwiegelshohn, Uwe Yahyapour, Ramin Univ Dortmund Dortmund Germany

This paper analyzes job scheduling for parallel computers by using theoretical and experimental means. Based on existing architectures we first present a machine and a job model. Then, we propose a simple on-line algorithm employing job preemption without migration and derive theoretical bounds for the performance of the algorithm. The algorithm is experimentally evaluated with trace data from a large computing facility. These experiments show that the algorithm is highly sensitive on parameter selection and that substantial performance improvements over existing (non-preemptive) scheduling methods are possible.

关键词： parallel processing systems

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Fast set operations using treaps 98

Fast set operations using treaps

引用

Proceedings of the 1998 10th annual acm symposium on parallel algorithms and architectures, SPAA

作者： Blelloch, G.E. Reid-Miller, M. Carnegie Mellon Univ Pittsburgh PA United States

ISBN: (纸本)9780897919890

We present parallel algorithms for union, intersection and difference on ordered sets using random balanced binary trees (treaps [26]). For two sets of size n and m (m ≤ n) the algorithms run in expected O(m lg(n/m)) work and O(lg n) depth (parallel time) on an EREW PRAM with scan operations (implying O(lg2 n) depth on a plain EREW PRAM). As with the sequential algorithms on treaps for insertion and deletion the main advantage of our algorithms are their simplicity. In fact our algorithms for set operations seem simpler than previous sequential algorithms with the same work bounds, and might therefore also be useful in a sequential context. To analyze the effectiveness of the algorithms we implemented both sequential and parallel versions of the algorithms and ran several experiments on them. Our parallel implementation uses the Cilk [5] shared memory runtime system on a 16 processor SGI Power Challenge and a 6 processor Sun Ultra Enterprise 3000. It shows reasonable speedup: 6.3 to 6.8 speedup on 8 processors of the SGI, and 4.1 to 4.4 speedup on 5 processors of the Sun.

关键词： parallel algorithms

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Framework for simple sorting algorithms on parallel disk systems

Framework for simple sorting algorithms on parallel disk sys...

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Proceedings of the 1998 10th annual acm symposium on parallel algorithms and architectures, SPAA

作者： Rajasekaran, S. Univ of Florida Gainesville United States

In this paper we present a simple parallel sorting algorithm and illustrate two applications. The algorithm (called the (l, m)-merge sort (LMM)) is an extension of the bitonic and odd-even merge sorts. Literature on parallel sorting is abundant. Many of the algorithms proposed, though being theoretically important, may not perform satisfactorily in practice owing to large constants in their time bounds. The algorithm to be presented in this paper, due partly to its simplicity, results in small constants. We present an implementation for the parallel disk sorting problem. The algorithm is asymptotically optimal (assuming that N is a polynomial in M, where N is the number of records to be sorted and M is the internal memory size). The underlying constant is very small. This algorithm has a better performance than the disk-striped mergesort (DSM) algorithm when the number of disks is large. Our implementation is as simple as that of DSM (requiring no fancy data structures or prefetch techniques). As a second application, we prove that we can get a sparse enumeration sort on the hypercube that is simpler than that of the classical algorithm of Nassimi and Sahni. We also show that Leighton's columnsort algorithm is a special case of LMM.

关键词： parallel algorithms

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Automatic parallel I/O performance optimization in Panda 98

Automatic parallel I/O performance optimization in Panda

引用

Proceedings of the 1998 10th annual acm symposium on parallel algorithms and architectures, SPAA

作者： Chen, Y. Winslett, M. Cho, Y. Kuo, S. Univ of Illinois

ISBN: (纸本)9780897919890

parallel I/O systems typically consist of individual processors, communication networks, and a large number of disks. Managing and utilizing these resources to meet performance, portability and usability goals of applications has become a significant challenge. We believe that a parallel I/O system that automatically selects efficient I/O plans for user applications is a solution to this problem. In this paper, we present such an automatic performance optimization approach for scientific applications performing collective I/O requests on multidimensional arrays. Under our approach, an optimization engine in a parallel I/O system selects optimal I/O plans automatically without human intervention based on a description of the application I/O requests and the system configuration. To validate our hypothesis, we have built an optimizer that uses a rule-based and randomized search-based algorithms to select optimal parameter settings in Panda, a parallel I/O library for multidimensional arrays. Our performance results obtained from two IBM SPs with significantly different configurations show that the Panda optimizer is able to select high-quality I/O plans and deliver high performance under a variety of system configurations.

关键词： parallel algorithms

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