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检索条件"任意字段=Proceedings of the ninth ACM SIGPLAN symposium on Principles and practice of parallel programming"

共 564 条记录，以下是31-40 订阅

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POSTER: Automatic Synthesis of parallel Unix Commands and Pipelines with KUMQUAT 27

POSTER: Automatic Synthesis of Parallel Unix Commands and Pi...

引用

27th acm sigplan symposium on principles and practice of parallel programming (PPoPP)

作者： Shen, Jiasi Rinard, Martin Vasilakis, Nikos MIT Cambridge MA USA

ISBN: (纸本)9781450392044

We present KUMQUAT, a system for automatically generating data-parallel implementations of UNIX shell commands and pipelines. The generated parallel versions split input streams, execute multiple instantiations of the original pipeline commands to process the splits in parallel, then combine the resulting parallel outputs to produce the final output stream. KumQUAT automatically synthesizes the combine operators, with a domain-specific combiner language acting as a strong regularizer that promotes efficient inference of correct combiners. We present experimental results that show that these combiners enable the effective parallelization of our benchmark scripts.

关键词： Automatic parallelization program synthesis

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Merchandiser: Data Placement on Heterogeneous Memory for Task-parallel HPC Applications with Load-Balance Awareness 23

Merchandiser: Data Placement on Heterogeneous Memory for Tas...

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28th acm sigplan Annual symposium on principles and practice of parallel programming, PPoPP 2023

作者： Xie, Zhen Liu, Jie Li, Jiajia Li, Dong University of California Argonne National Laboratory Merced United States University of California Merced United States North Carolina State University United States

ISBN: (纸本)9798400700156

The emergence of heterogeneous memory (HM) provides a cost-effective and high-performance solution to memory-consuming HPC applications. Deciding the placement of data objects on HM is critical for high performance. We reveal a performance problem related to data placement on HM. The problem is manifested as load imbalance among tasks in task-parallel HPC applications. The root of the problem comes from being unaware of parallel-task semantics and an incorrect assumption that bringing frequently accessed pages to fast memory always leads to better performance. To address this problem, we introduce a load balance-aware page management system, named Merchandiser. Merchandiser introduces task semantics during memory profiling, rather than being application-agnostic. Using the limited task semantics, Merchandiser effectively sets up coordination among tasks on the usage of HM to finish all tasks fast instead of only considering any individual task. Merchandiser is highly automated to enable high usability. Evaluating with memory-consuming HPC applications, we show that Merchandiser reduces load imbalance and leads to an average of 17.1% and 15.4% (up to 26.0% and 23.2%) performance improvement, compared with a hardware-based solution and an industry-quality software-based solution. © 2023 acm.

关键词： Semantics

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POSTER: parallel Algorithms for Masked Sparse Matrix-Matrix Products 27

POSTER: Parallel Algorithms for Masked Sparse Matrix-Matrix ...

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27th acm sigplan symposium on principles and practice of parallel programming (PPoPP)

作者： Milakovic, Srdan Selvitopi, Oguz Nisa, Israt Budimlic, Zoran Buluc, Aydin Rice Univ Houston Houston TX USA Lawrence Berkeley Nat Lab Berkeley Berkeley CA USA AWS Palo Alto Palo Alto CA USA

ISBN: (纸本)9781450392044

Computing the product of two sparse matrices (SpGEMM) is a fundamental operation in various combinatorial and graph algorithms as well as various bioinformatics and data analytics applications for computing inner-product similarities. For an important class of algorithms, only a subset of the output entries are needed, and the resulting operation is known as Masked SpGEMM since a subset of the output entries is considered to be "masked out". In this work, we investigate various novel algorithms and data structures for this rather challenging and important computation, and provide guidelines on how to design a fast Masked-SpGEMM for shared-memory architectures.

关键词： Masked-SpGEMM Sparse Matrix GraphBLAS

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POSTER: Automatic Differentiation of parallel Loops with Formal Methods 27

POSTER: Automatic Differentiation of Parallel Loops with For...

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27th acm sigplan symposium on principles and practice of parallel programming (PPoPP)

作者： Huckelheim, Jan Hascoet, Laurent Argonne Natl Lab Lemont IL 60439 USA Inria Sophia Antipolis Valbonne France

ISBN: (纸本)9781450392044

The accompanying poster to this short paper presents a combination of reverse mode AD and formal methods to enable efficient differentiation of (or backpropagation through) shared-memory parallel code. Compared to the state of the art, our approach can more often avoid the need for atomic updates or private data copies during the parallel derivative computation, even in the presence of unstructured or data-dependent data access patterns. This is achieved by gathering information about the memory access patterns from the input program, which is assumed to be correctly parallelized. This information is then used to build a model of assertions in a theorem prover, which can be used to check the safety of shared memory accesses during the parallel derivative computation.

关键词： Automatic Differentiation OpenMP Theorem Proving Formal Methods Data Flow Reversal

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A programming Model for GPU Load Balancing 23

A Programming Model for GPU Load Balancing

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28th acm sigplan Annual symposium on principles and practice of parallel programming, PPoPP 2023

作者： Osama, Muhammad Porumbescu, Serban D. Owens, John D. University of California DavisCA United States

ISBN: (纸本)9798400700156

We propose a GPU fine-grained load-balancing abstraction that decouples load balancing from work processing and aims to support both static and dynamic schedules with a programmable interface to implement new load-balancing schedules. Prior to our work, the only way to unleash the GPU's potential on irregular problems has been to workload-balance through application-specific, tightly coupled load-balancing techniques. With our open-source framework for load-balancing, we hope to improve programmers' productivity when developing irregular-parallel algorithms on the GPU, and also improve the overall performance characteristics for such applications by allowing a quick path to experimentation with a variety of existing load-balancing techniques. Consequently, we also hope that by separating the concerns of load-balancing from work processing within our abstraction, managing and extending existing code to future architectures becomes easier. © 2023 Owner/Author.

关键词： Graphics processing unit

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POSTER: LB-HM: Load Balance-Aware Data Placement on Heterogeneous Memory for Task-parallel HPC Applications 27

POSTER: LB-HM: Load Balance-Aware Data Placement on Heteroge...

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27th acm sigplan symposium on principles and practice of parallel programming (PPoPP)

作者： Xie, Zhen Liu, Jie Ma, Sam Li, Jiajia Li, Dong Univ Calif Merced CA USA Coll William Mary Williamsburg WA USA

ISBN: (纸本)9781450392044

The emergence of heterogeneous memory (HM) provides a cost-effective and high-performance solution to memory-consuming HPC applications. However, using HM, wisely migrating data objects on it is critical for high performance. In this work, we introduce a load balance-aware page management system, named LB-HM. LB-HM introduces task semantics during memory profiling, rather than being application-agnostic. Evaluating with a set of memory-consuming HPC applications, we show that we show that LB-HM reduces existing load imbalance and leads to an average of 17.1% and 15.4% (up to 26.0% and 23.2%) performance improvement, compared with a hardware-based solution and an industry-quality software-based solution on Optane-based HM.

关键词： Semantics

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POSTER: Towards OmpSs-2 and OpenACC Interoperation 27

POSTER: Towards OmpSs-2 and OpenACC Interoperation

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27th acm sigplan symposium on principles and practice of parallel programming (PPoPP)

作者： Korakitis, Orestis De Gonzalo, Simon Garcia Guidotti, Nicolas Barreto, Joao Pedro Monteiro, Jose C. Pena, Antonio J. Barcelona Supercomputing Ctr Barcelona Spain Univ Lisbon Inst Super Tecnico INESC ID Lisbon Portugal

ISBN: (纸本)9781450392044

The increasing demand in HPC to utilize accelerators has motivated the development of pragma-based directives to target these devices. OmpSs-2 and OpenACC are both directive-based solutions that allow application programmers to utilize accelerators. The two leverage distinct types of parallelism: task parallelism and data parallelism, respectively. Non-trivial scientific applications can benefit from both types of available parallelism. However, the combination of pragma-based models is difficult to coordinate, as both assume full control and are unaware of each other at runtime. We propose an interoperation mechanism to enable novel composability across pragma-based programming models. We study and propose a clear separation of duties and implement our approach by augmenting the OmpSs-2 programming model, compiler and runtime to support OmpSs-2 + OpenACC programming.

关键词： programming Productivity Data-flow Paradigm Runtime Scheduling Code Transformation parallelism GPU

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Exploring the Use of WebAssembly in HPC 23

Exploring the Use of WebAssembly in HPC

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28th acm sigplan Annual symposium on principles and practice of parallel programming, PPoPP 2023

作者： Chadha, Mohak Krueger, Nils John, Jophin Jindal, Anshul Gerndt, Michael Benedict, Shajulin Computer Architecture and Parallel Systems Technische Universität München Germany Department of Computer Science and Engg. Indian and Institute of Information Technology Kottayam Kerala India

ISBN: (纸本)9798400700156

Containerization approaches based on namespaces offered by the Linux kernel have seen an increasing popularity in the HPC community both as a means to isolate applications and as a format to package and distribute them. However, their adoption and usage in HPC systems faces several challenges. These include difficulties in unprivileged running and building of scientific application container images directly on HPC resources, increasing heterogeneity of HPC architectures, and access to specialized networking libraries available only on HPC systems. These challenges of container-based HPC application development closely align with the several advantages that a new universal intermediate binary format called WebAssembly (Wasm) has to offer. These include a lightweight userspace isolation mechanism and portability across operating systems and processor architectures. In this paper, we explore the usage of Wasm as a distribution format for MPI-based HPC applications. To this end, we present MPIWasm, a novel Wasm embedder for MPI-based HPC applications that enables high-performance execution of Wasm code, has low-overhead for MPI calls, and supports high-performance networking interconnects present on HPC systems. We evaluate the performance and overhead of MPIWasm on a production HPC system and AWS Graviton2 nodes using standardized HPC benchmarks. Results from our experiments demonstrate that MPIWasm delivers competitive native application performance across all scenarios. Moreover, we observe that Wasm binaries are 139.5x smaller on average as compared to the statically-linked binaries for the different standardized benchmarks. © 2023 acm.

关键词： Containers

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POSTER: A parallel Branch-and-Bound Algorithm with History-Based Domination 27

POSTER: A Parallel Branch-and-Bound Algorithm with History-B...

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27th acm sigplan symposium on principles and practice of parallel programming (PPoPP)

作者： Gonggiatgul, Taspon Shobaki, Ghassan Muyan-Ozcelik, Pinar Calif State Univ Sacramento CA USA

ISBN: (纸本)9781450392044

In this paper, we describe a parallel Branch-and-Bound (B&B) algorithm with a history-based domination technique, and we apply it to the Sequential Ordering Problem (SOP). To the best of our knowledge, the proposed algorithm is the first parallel B&B algorithm that includes a history-based domination technique and is the first parallel B&B algorithm for solving the SOP using a pure B&B approach. The proposed algorithm takes a pool-based approach and employs a collection of novel techniques that we have developed to achieve effective parallel exploration of the solution space, including parallel history domination, history table memory management, and a thread restart technique. The proposed algorithm was experimentally evaluated using the SOPLIB and TSPLIB benchmarks. The results show that using ten threads with a time limit of one hour on the medium-difficulty instances, the proposed algorithm gives a geometric-mean speedup of 19.9 on SOPLIB and 10.23 on TSPLIB, with super-linear speedups up to 65x seen on 17 instances.

关键词： parallel branch-and-bound sequential ordering problem combinatorial optimization NP-complete problems

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parallel Block-Delayed Sequences 22

Parallel Block-Delayed Sequences

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27th acm sigplan symposium on principles and practice of parallel programming (PPoPP)

作者： Westrick, Sam Rainey, Mike Anderson, Daniel Blelloch, Guy E. Carnegie Mellon Univ Pittsburgh PA 15213 USA

ISBN: (纸本)9781450392044

programming languages using functions on collections of values, such as map, reduce, scan and filter, have been used for over fifty years. Such collections have proven to be particularly useful in the context of parallelism because such functions are naturally parallel. However, if implemented naively they lead to the generation of temporary intermediate collections that can significantly increase memory usage and runtime. To avoid this pitfall, many approaches use "fusion" to combine operations and avoid temporary results. However, most of these approaches involve significant changes to a compiler and are limited to a small set of functions, such as maps and reduces. In this paper we present a library-based approach that fuses widely used operations such as scans, filters, and flattens. In conjunction with existing techniques, this covers most of the common operations on collections. Our approach is based on a novel technique which parallelizes over blocks, with streams within each block. We demonstrate the approach by implementing libraries targeting multicore parallelism in two languages: parallel ML and C++, which have very different semantics and compilers. To help users understand when to use the approach, we define a cost semantics that indicates when fusion occurs and how it reduces memory allocations. We present experimental results for a dozen benchmarks that demonstrate significant reductions in both time and space. In most cases the approach generates code that is near optimal for the machines it is running on.

关键词： parallel programming fusion collections functional programming

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