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Session details: parallel computing 11

Session details: Parallel computing

引用

proceedings of the twenty-third annual acm symposium on parallelism in algorithms and architectures

作者： Geppino Pucci University of Padova

No abstract available.

ISBN: (纸本)9781450307437

No abstract available.

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Component structure of the vacant set induced by a random walk on a random graph 11

Component structure of the vacant set induced by a random wa...

引用

annual acm-Society for Industrial and Applied Mathmatics symposium on Discrete algorithms

作者： Colin Cooper Alan Frieze Department of Computer Science King's College University of London Department of Mathematical Sciences Carnegie Mellon University

ISBN: (纸本)9780898719932

We consider random walks on two classes of random graphs and explore the likely structure of the set of unvisited vertices (or vacant set). Let Γ(t) be the subgraph induced by the vacant set. We show that for random graphs G_(n,p) above the connectivity threshold, and for random regular graphs G_r, for constant r≥3, there is a phase transition in the sense of the well-known Erdos-Renyi phase transition. Thus for t≤(1-ε)t~* we have a unique giant plus components of size O(log n) and for t≥(1+ε)t~* we have only components of size O(log n). In the case of G_r we describe the likely degree sequence and structure of the small (O(log n)) size components.

关键词： Component architectures Random walk Phase transtormations solidification Random Set (Psychology) Line graph

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parallel Approximation algorithms for Facility-Location Problems 10

Parallel Approximation Algorithms for Facility-Location Prob...

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22nd acm symposium on parallelism in algorithms and architectures

作者： Blelloch, Guy E. Tangwongsan, Kanat Carnegie Mellon Univ Pittsburgh PA 15213 USA

ISBN: (纸本)9781450300797

This paper presents the design and analysis of parallel approximation algorithms for facility-location problems, including NC and RNC algorithms for (metric) facility location, k-center, k-median, and k-means These problems have received considerable attention during the past decades from the approximation algorithms community, which primarily concentrates on improving the approximation guarantees In this paper, we ask. Is it possible to parallelize some of the beautiful results from the sequential setting? Our starting point is a small, but diverse, subset of results in approximation algorithms for facility-location problems, with a primary goal of developing techniques for devising their efficient parallel counterparts. We focus on giving algorithms with low depth, near work efficiency (compared to the sequential versions), and low cache complexity

关键词： parallel algorithms approximation algorithms facility location problems

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Towards Optimizing Energy Costs of algorithms for Shared Memory architectures 10

Towards Optimizing Energy Costs of Algorithms for Shared Mem...

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22nd acm symposium on parallelism in algorithms and architectures

作者： Korthikanti, Vijay Anand Agha, Gul Univ Illinois Dept Comp Sci Urbana IL USA

ISBN: (纸本)9781450300797

Energy consumption by computer systems has emerged as an important concern However, the energy consumed in executing an algorithm cannot be inferred from its performance alone it must be modeled explicitly This paper analyzes energy consumption of parallel algorithms executed on shared memory multicore processors Specifically, we develop a methodology to evaluate how energy consumption of a given parallel algorithm changes as the number of cores and their frequency is varied We use this analysis to establish the optimal number of cores to minimize the energy consumed by the execution of a parallel algorithm for a specific problem size while satisfying a given performance requirement We study the sensitivity of our analysis to changes in parameters such as the ratio of the power consumed by a computation step versus the power consumed in accessing memory The results show that the relation between the problem size and the optimal number of cores is relatively unaffected for a wide range of these parameters.

关键词： Energy Performance parallel algorithms Shared Memory architectures

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Brief Announcement: A Reinforcement Learning Approach for Dynamic Load-Balancing of parallel Digital Logic Simulation 10

Brief Announcement: A Reinforcement Learning Approach for Dy...

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22nd acm symposium on parallelism in algorithms and architectures

作者： Meraji, Sina Zhang, Wei Tropper, Carl McGill Univ Sch Comp Sci Montreal PQ Canada

ISBN: (纸本)9781450300797

In this paper, we present a dynamic load-balancing algorithm for parallel digital logic simulation making use of reinforcement learning We first introduce two dynamic load-balancing algorithms oriented towards balancing the computational and communication load respectively and then utilize reinforcement learning to create an algorithm which is a combination of the first two algorithms In addition, the algorithm determines the value of two important parameters the number of processors which participate in the algorithm and the load which is exchanged during its execution. We investigate the algorithms on gate level simulations of several open source VLSI circuits

关键词： Digital Logic Simulation Dynamic load-balancing Reinforcement Learning Time Warp Verilog

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Low Depth Cache-Oblivious algorithms 10

Low Depth Cache-Oblivious Algorithms

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22nd acm symposium on parallelism in algorithms and architectures

作者： Blelloch, Guy E. Gibbons, Phillip B. Simhadri, Harsha Vardhan Carnegie Mellon Univ Pittsburgh PA 15213 USA

ISBN: (纸本)9781450300797

In this paper we explore a simple and general approach for developing parallel algorithms that lead to good cache complexity on parallel machines with private or shared caches The approach is to design nested-parallel algorithms that have low depth (span. critical path length) and for which the natural sequential evaluation order has low cache complexity in the cache-oblivious model We describe several cache-oblivious algorithms with optimal work, polylogarithmic depth, and sequential cache complexities that match the best sequential algorithms, including the first such algorithms for sorting and for sparse-matrix vector multiply on matrices with good vertex separators Using known mappings. our results lead to low cache complexities on shared-memory multiprocessors with a single level of private caches or a single shared cache We generalize these mappings to multi-level cache hierarchies of private or shared caches, implying that our algorithms also have low cache complexities on such hierarchies The key factor in obtaining these low parallel cache complexities is the low depth of the algorithms we propose.

关键词： Cache-oblivious algorithms sorting sparse-matrix vector multiply graph algorithms parallel algorithms multiprocessors schedulers

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Brief Announcement: Serial-parallel Reciprocity in Dynamic Multithreaded Languages 10

Brief Announcement: Serial-Parallel Reciprocity in Dynamic M...

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22nd acm symposium on parallelism in algorithms and architectures

作者： Agrawal, Kunal Lee, I-Ting Angelina Sukha, Jim Washington Univ St Louis MO 63130 USA

ISBN: (纸本)9781450300797

In dynamically multithreaded platforms that employ work stealing, there appears to be a fundamental tradeoff between providing provably good time and space bounds and supporting SP-reciprocity, the property of allowing arbitrary calling between parallel and serial code, including legacy serial binaries. Many known dynamically multithreaded platforms either fail to support SP-reciprocity or sacrifice on the provable time and space bounds that an efficient work-stealing scheduler could otherwise guarantee We describe PR-Cilk, a design of a runtime system that supports SP-reciprocity in Cilk and provides provable bounds on time and space In order to maintain the space bound, PR-Cilk uses subtree-restricted work stealing. We show that with subtree-restricted work stealing. PR-Cilk provides the same guarantee on stack space usage as ordinary Cilk. The completion time guaranteed by PR-Cilk is slightly worse than ordinary Cilk Nevertheless, if the number of times a C function calls a Cilk function is small, or if each Cilk function called by a C function is sufficiently parallel. PR-Cilk still guarantees linear speedup.

关键词： Cilk dynamic multithreading Intel Threading Building Blocks scheduling work stealing serial-parallel reciprocity

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Implementing and Evaluating Nested parallel Transactions in Software Transactional Memory 10

Implementing and Evaluating Nested Parallel Transactions in ...

引用

22nd acm symposium on parallelism in algorithms and architectures

作者： Baek, Woongki Bronson, Nathan Kozyrakis, Christos Olukotun, Kunle Stanford Univ Comp Syst Lab Stanford CA 94305 USA

ISBN: (纸本)9781450300797

Transactional Memory (TM) is a promising technique that simplifies parallel programming for shared-memory applications To date, most TM systems have been designed to efficiently support single-level parallelism To achieve widespread use and maximize performance gains. TM must support nested parallelism available in many applications and supported by several programming models. We present NesTM, a software TM (STM) system that supports closed-nested parallel transactions NesTM is based on a high-performance. blocking STM that uses eager version management and word-granularity conflict detection Its algorithm targets the state and runtime overheads of nested parallel transactions We also describe several subtle correctness issues in supporting nested parallel transactions in NesTM and discuss their performance impact Through our evaluation, we quantitatively analyze the performance of NesTM using STAMP applications and microbenchmarks based on concurrent data structures. First, we show that the performance overhead of NesTM is reasonable when single-level parallelism is used. second. we quantify the incremental overhead of NesTM when the parallelism is exploited in deeper nesting levels and draw conclusions that can be useful in designing a nesting-aware TM runtime environment. Finally, we demonstrate a use-case where nested parallelism improves the performance of a transactional microbenchmark

关键词： Transactional Memory Nested parallelism parallel Programming

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SPAA'10 - proceedings of the 22nd annual symposium on parallelism in algorithms and architectures

SPAA'10 - Proceedings of the 22nd Annual Symposium on Parall...

引用

22nd acm symposium on parallelism in algorithms and architectures, SPAA'10

ISBN: (纸本)9781450300797

The proceedings contain 45 papers. The topics discussed include: buffer-space efficient and deadlock-free scheduling of stream applications on multi-core architectures;scheduling to minimize power consumption using submodular functions;collaborative scoring with dishonest participants;securing every bit: authenticated broadcast in radio networks;brief announcement: on speculative replication of transactional systems;data-aware scheduling of legacy kernels on heterogeneous platforms with distributed memory;basic network creation games;on the bit communication complexity of randomized rumor spreading;algorithms and application for grids and clouds;towards optimizing energy costs of algorithms for shared memory architectures;brief announcement: on regenerator placement problems in optical networks;best-effort group service in dynamic networks;and implementing and evaluating nested parallel transactions in software transactional memory.

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Buffer-space Efficient and Deadlock-free Scheduling of Stream Applications on Multi-core architectures 10

Buffer-space Efficient and Deadlock-free Scheduling of Strea...

引用

22nd acm symposium on parallelism in algorithms and architectures

作者： Park, Jongsoo Dally, William J. Stanford Univ Comp Syst Lab Stanford CA 94305 USA

ISBN: (纸本)9781450300797

We present a scheduling algorithm of stream programs for multi-core architectures called team scheduling Compared to previous multi-core stream scheduling algorithms, team scheduling achieves 1) similar synchronization overhead, 2) coverage of a larger class of applications, 3) better control over buffer space, 4) deadlock-free feedback loops, and 5) lower latency We compare team scheduling to the latest stream scheduling algorithm, SGMS, by evaluating 14 applications on a multi-core architecture with 16 cores. Team scheduling successfully targets applications that cannot be validly scheduled by SGMS clue to excessive buffer requirement or deadlocks in feedback loops (e.g., GSM and W-cDmA) For applications that can be validly scheduled by SGMS, team scheduling shows on average 37% higher throughput within the same buffer space constraints

关键词： Compiler and Tools for Concurrent Programming Stream Programming Green Computing and Power-Efficient architectures Multi-core architectures

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