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Designing and auto-tuning parallel 3-D FFT for computation-communication overlap 14

Designing and auto-tuning parallel 3-D FFT for computation-c...

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2014 19th acm sigplan symposium on principles and practice of parallel programming, PPoPP 2014

作者： Song, Sukhyun Hollingsworth, Jeffrey K. Department of Computer Science University of Maryland College Park United States

ISBN: (纸本)9781450326568

This paper presents a method to design and auto-tune a new parallel 3-D FFT code using the non-blocking MPI all-to-all operation. We achieve high performance by optimizing computation-communication overlap. Our code performs fully asynchronous communication without any support from special hardware. We also improve cache performance through loop tiling. To cope with the complex tradeoff regarding our optimization techniques, we parameterize our code and auto-tune the parameters efficiently in a large parameter space. Experimental results from two systems confirm that our code achieves a speedup of up to 1.76× over the FFTW library. Copyright © 2014 acm.

关键词： Fast Fourier transforms

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PPoPP'12 - Proceedings of the 2012 acm sigplan symposium on principles and practice of parallel programming

PPoPP'12 - Proceedings of the 2012 ACM SIGPLAN Symposium on ...

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17th acm sigplan symposium on principles and practice of parallel programming, PPoPP'12

ISBN: (纸本)9781450311601

The proceedings contain 57 papers. The topics discussed include: scalable framework for mapping streaming applications onto multi-GPU systems;efficient performance evaluation of memory hierarchy for highly multithreaded graphics processors;extending a C-like language for portable SIMD programming;DOJ: dynamically parallelizing object-oriented programs;GPU-based NFA implementation for memory efficient high speed regular expression matching;concurrent tries with efficient non-blocking snapshots;deterministic parallel random-number generation for dynamic-multithreading platforms;algorithm-based fault tolerance for dense matrix factorizations;revisiting the combining synchronization technique;FlexBFS: a parallelism-aware implementation of breadth-first search on GPU;optimizing remote accesses for offloaded kernels: application to high-level synthesis for FPGA;and the boat hull model: adapting the roofline model to enable performance prediction for parallel computing.

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Well-structured futures and cache locality 14

Well-structured futures and cache locality

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2014 19th acm sigplan symposium on principles and practice of parallel programming, PPoPP 2014

作者： Herlihy, Maurice Liu, Zhiyu Computer Science Department Brown University United States

ISBN: (纸本)9781450326568

In fork-join parallelism, a sequential program is split into a directed acyclic graph of tasks linked by directed dependency edges, and the tasks are executed, possibly in parallel, in an order consistent with their dependencies. A popular and effective way to extend fork-join parallelism is to allow threads to create futures. A thread creates a future to hold the results of a computation, which may or may not be executed in parallel. That result is returned when some thread touches that future, blocking if necessary until the result is ready. Recent research has shown that while futures can, of course, enhance parallelism in a structured way, they can have a deleterious effect on cache locality. In the worst case, futures can incur Ω(PT ∞ +tT∞) deviations, which implies Ω(CPT∞+CtT∞) additional cache misses, where C is the number of cache lines, P is the number of processors, t is the number of touches, and T∞ is the computation span. Since cache locality has a large impact on software performance on modern multicores, this result is troubling. In this paper, however, we show that if futures are used in a simple, disciplined way, then the situation is much better: if each future is touched only once, either by the thread that created it, or by a later descendant of the thread that created it, then parallel executions with work stealing can incur at most O(CPT2∞ ) additional cache misses, a substantial improvement. This structured use of futures is characteristic of many (but not all) parallel applications. Copyright © 2014 acm.

关键词： parallel programming

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Efficient deterministic multithreading without global barriers 14

Efficient deterministic multithreading without global barrie...

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Proceedings of the 19th acm sigplan symposium on principles and practice of parallel programming

作者： Lu, Kai Zhou, Xu Bergan, Tom Wang, Xiaoping Science and Technology on Parallel and Distributed Processing Laboratory National University of Defense Technology Changsha China College of Computer National University of Defense Technology Changsha China University of Washington Computer Science and Engineering United States

ISBN: (纸本)9781450326568

Multithreaded programs execute nondeterministically on conventional architectures and operating systems. This complicates many tasks, including debugging and testing. Deterministic multithreading (DMT) makes the output of a multithreaded program depend on its inputs only, which can totally solve the above problem. However, current DMT implementations suffer from a common inefficiency: they use frequent global barriers to enforce a deterministic ordering on memory accesses. In this paper, we eliminate that inefficiency using an execution model we call deterministic lazy release consistency (DLRC). Our execution model uses the Kendo algorithm to enforce a deterministic ordering on synchronization, and it uses a deterministic version of the lazy release consistency memory model to propagate memory updates across threads. Our approach guarantees that programs execute deterministically even when they contain data races. We implemented a DMT system based on these ideas (RFDet) and evaluated it using 17 parallel applications. Our implementation targets C/C++ programs that use POSIX threads. Results show that RFDet gains nearly 2x speedup compared with DThreads-a start-of-the-art DMT system. Copyright © 2014 acm.

关键词： C++ (programming language)

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Data structures for task-based priority scheduling 14

Data structures for task-based priority scheduling

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2014 19th acm sigplan symposium on principles and practice of parallel programming, PPoPP 2014

作者： Wimmer, Martin Versaci, Francesco Träff, Jesper Larsson Cederman, Daniel Tsigas, Philippas Faculty of Informatics Parallel Computing Vienna University of Technology 1040 Vienna/Wien Austria Computer Science and Engineering Chalmers University of Technology 412 96 Göteborg Sweden

ISBN: (纸本)9781450326568

We present three lock-free data structures for priority task scheduling: a priority work-stealing one, a centralized one with ρ-relaxed semantics, and a hybrid one combining both concepts. With the single-source shortest path (SSSP) problem as example, we show how the different approaches affect the prioritization and provide upper bounds on the number of examined nodes. We argue that priority task scheduling allows for an intuitive and easy way to parallelize the SSSP problem, notoriously a hard task. Experimental evidence supports the good scalability of the resulting algorithm. The larger aim of this work is to understand the trade-offs between scalability and priority guarantees in task scheduling systems. We show that ρ-relaxation is a valuable technique for improving the first, while still allowing semantic constraints to be satisfied: the lock-free, hybrid κ-priority data structure can scale as well as work-stealing, while still providing strong priority scheduling guarantees, which depend on the parameter κ. Our theoretical results open up possibilities for even more scalable data structures by adopting a weaker form of ρ-relaxation, which still enables the semantic constraints to be respected.

关键词： Scalability

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CUDA-NP: Realizing nested thread-level parallelism in GPGPU applications 14

CUDA-NP: Realizing nested thread-level parallelism in GPGPU ...

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2014 19th acm sigplan symposium on principles and practice of parallel programming, PPoPP 2014

作者： Yang, Yi Zhou, Huiyang Department of Computing Systems Architecture NEC Laboratories America Inc. United States Department of Electrical and Computer Engineering North Carolina State University United States

ISBN: (纸本)9781450326568

parallel programs consist of series of code sections with different thread-level parallelism (TLP). As a result, it is rather common that a thread in a parallel program, such as a GPU kernel in CUDA programs, still contains both sequential code and parallel loops. In order to leverage such parallel loops, the latest Nvidia Kepler architecture introduces dynamic parallelism, which allows a GPU thread to start another GPU kernel, thereby reducing the overhead of launching kernels from a CPU. However, with dynamic parallelism, a parent thread can only communicate with its child threads through global memory and the overhead of launching GPU kernels is non-trivial even within GPUs. In this paper, we first study a set of GPGPU benchmarks that contain parallel loops, and highlight that these benchmarks do not have a very high loop count or high degrees of TLP. Consequently, the benefits of leveraging such parallel loops using dynamic parallelism are too limited to offset its overhead. We then present our proposed solution to exploit nested parallelism in CUDA, referred to as CUDA-NP. With CUDA-NP, we initially enable a high number of threads when a GPU program starts, and use control flow to activate different numbers of threads for different code sections. We implemented our proposed CUDA-NP framework using a directive-based compiler approach. For a GPU kernel, an application developer only needs to add OpenMP-like pragmas for parallelizable code sections. Then, our CUDA-NP compiler automatically generates the optimized GPU kernels. It supports both the reduction and the scan primitives, explores different ways to distribute parallel loop iterations into threads, and efficiently manages on-chip resource. Our experiments show that for a set of GPGPU benchmarks, which have already been optimized and contain nested parallelism, our proposed CUDA-NP framework further improves the performance by up to 6.69 times and 2.18 times on average. Copyright © 2014 acm.

关键词： Application programming interfaces (API)

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SCCMulti: An improved parallel strongly connected components algorithm 14

SCCMulti: An improved parallel strongly connected components...

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2014 19th acm sigplan symposium on principles and practice of parallel programming, PPoPP 2014

作者： Tomkins, Daniel Smith, Timmie Amato, Nancy M. Rauchwerger, Lawrence Parasol Laboratory Department of Computer Science and Engineering Texas A and M University United States

ISBN: (纸本)9781450326568

Tarjan's famous linear time, sequential algorithm for finding the strongly connected components (SCCs) of a graph relies on depth first search, which is inherently sequential. Deterministic parallel algorithms solve this problem in logarithmic time using matrix multiplication techniques, but matrix multiplication requires a large amount of total work. Randomized algorithms based on reachability - the ability to get from one vertex to another along a directed path - greatly improve the work bound in the average case. However, these algorithms do not always perform well;for instance, Divide-and-Conquer Strong Components (DCSC), a scalable, divide-and-conquer algorithm, has good expected theoretical limits, but can perform very poorly on graphs for which the maximum reachability of any vertex is small. A related algorithm, MultiPivot, gives very high probability guarantees on the total amount of work for all graphs, but this improvement introduces an overhead that increases the average running time. This work introduces SCCMulti, a multi-pivot improvement of DCSC that offers the same consistency as MultiPivot without the time overhead. We provide experimental results demonstrating SCCMulti's scalability;these results also show that SCCMulti is more consistent than DCSC and is always faster than MultiPivot.

关键词： Matrix algebra

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Resilient X10: Efficient failure-aware programming 14

Resilient X10: Efficient failure-aware programming

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2014 19th acm sigplan symposium on principles and practice of parallel programming, PPoPP 2014

作者： Cunningham, David Grove, David Herta, Benjamin Iyengar, Arun Kawachiya, Kiyokuni Murata, Hiroki Saraswat, Vijay Takeuchi, Mikio Tardieu, Olivier IBM T. J. Watson Research Center Japan Google Inc. Japan IBM Research Tokyo Japan

ISBN: (纸本)9781450326568

Scale-out programs run on multiple processes in a cluster. In scale-out systems, processes can fail. Computations using traditional libraries such as MPI fail when any component process fails. The advent of Map Reduce, Resilient Data Sets and MillWheel has shown dramatic improvements in productivity are possible when a high-level programming framework handles scale-out and resilience automatically. We are concerned with the development of generalpurpose languages that support resilient programming. In this paper we show how the X10 language and implementation can be extended to support resilience. In Resilient X10, places may fail asynchronously, causing loss of the data and tasks at the failed place. Failure is exposed through exceptions. We identify a Happens Before Invariance Principle and require the runtime to automatically repair the global control structure of the program to maintain this principle. We show this reduces much of the burden of resilient programming. The programmer is only responsible for continuing execution with fewer computational resources and the loss of part of the heap, and can do so while taking advantage of domain knowledge. We build a complete implementation of the language, capable of executing benchmark applications on hundreds of nodes. We describe the algorithms required to make the language runtime resilient. We then give three applications, each with a different approach to fault tolerance (replay, decimation, and domain-level checkpointing). These can be executed at scale and survive node failure. We show that for these programs the overhead of resilience is a small fraction of overall runtime by comparing to equivalent non-resilient X10 programs. On one program we show end-to-end performance of Resilient X10 is ∼100x faster than Hadoop. Copyright © 2014 acm.

关键词： Fault tolerance

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Real-Time Matching of Antescofo Temporal Patterns 14

Real-Time Matching of <i>Antescofo</i> Temporal Patterns

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16th International symposium on principles and practice of Declarative programming (PPDP)

作者： Giavitto, Jean-Louis Echeveste, Jose IRCAM UMR STMS 9912 CNRS 1 Pl Igor Stravinsky F-75004 Paris France INRIA MuTant Project 1 Pl Igor Stravinsky F-75004 Paris France Univ Paris 06 Sorbonne Univ 1 Pl Igor Stravinsky F-75004 Paris France

ISBN: (纸本)9781450329477

online matching. Antescofo is a real-time system for performance coordination between musicians and computer processes during live music concert. ATP are used to define complex events that correspond to a combination of perceived events in the musical environment as well as arbitrary logical and metrical temporal conditions. The real-time recognition of such event is used to trigger arbitrary actions in the style of event-condition-action rules. The musical context, the rationales of temporal patterns and several illustrative examples are introduced to motivate the design of ATP. The semantics of ATP matching is defined to parallel the well-known notion of regular expression and Brzozowski's derivatives but extended to handle an infinite alphabet, arbitrary predicates, elapsing time and inhibitory conditions. This approach is compared to those developed in log auditing and for the runtime verification of realtime logics. ATP are implemented by translation into a core subset of the Antescofo domain-specific language. This compilation has proven efficient enough to avoid the extension of the real-time runtime of the language and has been validated with composers in actual pieces.

关键词： timed regular expressions event-driven programming score following timed and reactive system domain-specific language computer music Antescofo

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Session details: Session order 8: programming systems session 14

Session details: Session order 8: programming systems sessio...

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Proceedings of the 19th acm sigplan symposium on principles and practice of parallel programming

作者： Kunle Olukotun Stanford

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ISBN: (纸本)9781450326568

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