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检索条件"任意字段=16th Symposium on Computer Architecture and High Performance Computing"

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echofs: A Scheduler-guided Temporary Filesystem to leverage Node-local NVMs 30

echofs: A Scheduler-guided Temporary Filesystem to leverage ...

引用

30th International symposium on computer architecture and high performance computing (SBAC-PAD)

作者： Miranda, Alberto Nou, Ramon Cortes, Toni BSC Barcelona Spain Univ Politecn Cataluna BSC Barcelona Spain

ISBN: (纸本)9781538677698

the growth in data-intensive scientific applications poses strong demands on the HPC storage subsystem, as data needs to be copied from compute nodes to I/O nodes and vice versa for jobs to run. the emerging trend of adding denser, NVM-based burst buffers to compute nodes, however, offers the possibility of using these resources to build temporary filesystems with specific I/O optimizations for a batch job. In this work, we present echofs, a temporary filesystem that coordinates with the job scheduler to preload a job's input files into node-local burst buffers. We present the results measured with NVM emulation, and different FS backends with DAX/FUSE on a local node, to show the benefits of our proposal and such coordination.

关键词： Buffer storage Metadata Fuses Nonvolatile memory Hardware computer architecture Random access memory

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Transparent network services via a virtual traffic layer for virtual machines 07

Transparent network services via a virtual traffic layer for...

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16th International symposium on high performance Distributed computing 2007, HPDC'07 and Co-Located Workshops

作者： Lange, John R. Dinda, Peter A. Department of Electrical Engineering and Computer Science Northwestern University Evanston IL United States

ISBN: (纸本)1595936734

We claim that network services can be transparently added to existing unmodified applications running inside virtual machine environments. Examples of these network services include protocol transformations (e.g. TCP to UDT), network connection persistence during long duration unavailability (e.g. wide area VM migration), and network flow modification (e.g. local acknowledgments and Split-TCP). To demonstrate the utility of this concept, and to enable the practical implementations of these examples and others, we have developed VTL. VTL is a framework for packet modification and creation whose purpose is to modify network traffic to and from a VM, doing so transparently to the VM and its applications. We explain how to use VTL to implement the examples mentioned above and others, such as providing anonymized connectivity for a virtual machine through the Tor anonymizing network, and creating cooperative selective wormholing services for network intrusion detection systems. Copyright 2007 ACM.

关键词： Network protocols

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Cloud workload prediction and generation models 29

Cloud workload prediction and generation models

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29th International symposium on computer architecture and high performance computing SBAC-PAD

作者： Madi-Wamba, Gilles Li, Yunbo Orgerie, Anne-Cecile Beldiceanu, Nicolas Menaud, Jean-Marc IMT Atlantique LS2N Nantes France CNRS IRISA Rennes France

ISBN: (纸本)9781509012336

Cloud computing allows for elasticity as users can dynamically benefit from new virtual resources when their workload increases. Such a feature requires highly reactive resource provisioning mechanisms. In this paper, we propose two new workload prediction models, based on constraint programming and neural networks, that can be used for dynamic resource provisioning in Cloud environments. We also present two workload trace generators that can help to extend an experimental dataset in order to test more widely resource optimization heuristics. Our models are validated using real traces from a small Cloud provider. Both approaches are shown to be complimentary as neural networks give better prediction results, while constraint programming is more suitable for trace generation.

关键词： Time series analysis Predictive models Programming Cloud computing Neural networks Virtual machining

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A parallel implementation of the LTSn method for a radiative transfer problem 15

A parallel implementation of the LTSn method for a radiative...

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15th symposium on computer architecture and high performance computing

作者： Souto, RR Velho, HFD Stephany, S Preto, AJ Segatto, CF Vilhena, MT Natl Inst Space Res Brazil INPE Postgrad Program Appl Comp BR-12245970 Sao Jose Dos Campos SP Brazil

ISBN: (纸本)0769520464

A radiative transfer solver that implements the LTSn method was optimized and parallelized using the MPI message passing communication library. Timing and profiling information was obtained for the sequential code in order to identify performance bottlenecks. performance tests were executed in a distributed memory parallel machine, a multi-computer based on IA-32 architecture. the radiative transfer equation was solved for a cloud test case to evaluate the parallel performance of the LTSn method. the LTSn code include spatial discretization of the domain and Fourier decomposition of the radiances leading to independent azimuthal modes. this yields an independent radiative transfer equation for each mode that can be executed by a different processor in a parallel implementation. Speed-up results show that the parallel implementation is suitable for the used architecture.

关键词： Communication standards computer architecture Concurrent computing Laplace equations Libraries Matrix decomposition Message passing Parallel machines Testing Timing

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Parallel implementation of a lattice-gauge-theory code: studying quark confinement on PC clusters 15

Parallel implementation of a lattice-gauge-theory code: stud...

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15th symposium on computer architecture and high performance computing

作者： Cucchieri, A Mendes, T Travieso, G Taurines, AR Univ Sao Paulo Inst Fis Sao Carlos BR-13560970 Sao Carlos SP Brazil

ISBN: (纸本)0769520464

We consider the implementation of a parallel Monte Carlo code for high-performance simulations on PC clusters with MPI. We carry out tests of speedup and efficiency. the code is used for numerical simulations of pure SU (2) lattice gauge theory at very large lattice volumes, in order to study the infrared behavior of gluon and ghost propagators. this problem is directly related to the confinement of quarks and gluons in the physics of strong interactions.

关键词： Computational modeling computer simulation Electromagnetic forces Lattices Neutrons Numerical simulation Physics Protons Quantum mechanics Supercomputers

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Hybrid task scheduling: Integrating static and dynamic heuristics 15

Hybrid task scheduling: Integrating static and dynamic heuri...

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15th symposium on computer architecture and high performance computing

作者： Boeres, C Lima, A Rebello, VEF Univ Fed Fluminense Inst Comp Niteroi RJ Brazil

ISBN: (纸本)0769520464

Researchers are constantly looking for ways to improve the execution time of parallel applications on distributed systems. Although compile-time static scheduling heuristics employ complex mechanisms, the quality of their schedules are handicapped by estimated run-time costs. On the other hand, while dynamic schedulers use actual run-time costs, they have to be of low complexity in order to reduce the scheduling overhead this paper investigates the viability of integrating these two approaches into a hybrid scheduling framework. the relationship between static schedulers, dynamic heuristics and scheduling events are examined the results show that a hybrid scheduler can indeed improve the schedules produced by good traditional static list scheduling algorithms.

关键词： Clustering algorithms Computational efficiency computer architecture Costs Distributed computing Dynamic scheduling Grid computing Processor scheduling Runtime Scheduling algorithm

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Interactive Data Exploration for high-performance Fluid Flow Computations through Porous Media 16

Interactive Data Exploration for High-Performance Fluid Flow...

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16th International symposium on Symbolic and Numeric Algorithms for Scientific computing (SYNASC)

作者： Perovic, Nevena Frisch, Jerome Mundani, Ralf-Peter Rank, Ernst Tech Univ Munich Chair Computat Engn D-80290 Munich Germany

ISBN: (纸本)9781479984480

Huge data advent in high-performance computing (HPC) applications such as fluid flow simulations usually hinders the interactive processing and exploration of simulation results. Such an interactive data exploration not only allows scientiest to 'play' with their data but also to visualise huge (distributed) data sets in both an efficient and easy way. therefore, we propose an HPC data exploration service based on a sliding window concept, that enables researches to access remote data (available on a supercomputer or cluster) during simulation runtime without exceeding any bandwidth limitations between the HPC back-end and the user front-end.

关键词： high-performance computing interactive data exploration adaptive data structure multi-grid-like solver concept flow through porous media

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Pliant: Leveraging Approximation to Improve Datacenter Resource Efficiency 25

Pliant: Leveraging Approximation to Improve Datacenter Resou...

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25th IEEE International symposium on high performance computer architecture (HPCA)

作者： Kulkarni, Neeraj Qi, Feng Delimitrou, Christina Cornell Univ Ithaca NY 14853 USA

ISBN: (纸本)9781728114446

Cloud multi-tenancy is typically constrained to a single interactive service colocated with one or more batch, low-priority services, whose performance can be sacrificed when deemed necessary. Approximate computing applications offer the opportunity to enable tighter colocation among multiple applications whose performance is important. We present Pliant, a lightweight cloud runtime that leverages the ability of approximate computing applications to tolerate some loss in their output quality to boost the utilization of shared servers. During periods of high resource contention, Pliant employs incremental and interference-aware approximation to reduce contention in shared resources, and prevent QoS violations for co-scheduled interactive, latency-critical services. We evaluate Pliant across different interactive and approximate computing applications, and show that it preserves QoS for all co-scheduled workloads, while incurring a 2.1% loss in output quality, on average.

关键词： Quality of service Approximate computing Runtime Cloud computing Interference Optimization Synchronization

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A Time-predictable Stack Cache 16

A Time-predictable Stack Cache

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16th IEEE International symposium on Object/Component/Service-Oriented Real-Time Distributed computing (ISORC)

作者： Abbaspour, Sahar Brandner, Florian Schoeberl, Martin Tech Univ Denmark Dept Appl Math & Comp Sci Lyngby Denmark

ISBN: (纸本)9781479921133

Real-time systems need time-predictable architectures to support static worst-case execution time (WCET) analysis. One architectural feature, the data cache, is hard to analyze when different data areas (e.g., heap allocated and stack allocated data) share the same cache. this sharing leads to less precise results of the cache analysis part of the WCET analysis. Splitting the data cache for different data areas enables composable data cache analysis. the WCET analysis tool can analyze the accesses to these different data areas independently. In this paper we present the design and implementation of a cache for stack allocated data. Our port of the LLVM C++ compiler supports the management of the stack cache. the combination of stack cache instructions and the hardware implementation of the stack cache is a further step towards time-predictable architectures.

关键词： computer architecture Hardware Pipelines Reduced instruction set computing Registers System-on-chip Reduced instruction set computers data cache Cache memory system-on-chip digital domain computer architecture Registers Furnace conveyors pipeline computer hardware piping

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On-chip Parallel Photonic Reservoir computing using Multiple Delay lines 32

On-chip Parallel Photonic Reservoir Computing using Multiple...

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32nd IEEE International symposium on computer architecture and high-performance computing (SBAC-PAD) / 11th Workshop on Applications for Multi-Core architectures (WAMCA)

作者： Hasnain, Syed Ali Mahapatra, Rabi Texas A&M Univ Dept Comp Sci & Engn College Stn TX 77843 USA

ISBN: (纸本)9781728199245

Silicon-Photonics architectures have enabled high speed hardware implementations of Reservoir computing (RC). With a delayed feedback reservoir (DFR) model, only one non-linear node can be used to perform RC. However, the delay is often provided by using off-chip fiber optics which is not only space inconvenient but it also becomes architectural bottleneck and hinders to scalability. In this paper, we propose a completely on-chip photonic RC architecture for high performance computing, employing multiple electronically tunable delay lines and micro-ring resonator (MRR) switch for multi-tasking. Proposed architecture provides 84% less error compared to the state-of-the-art standalone architecture in [8] for executing NARMA task. For multi-tasking, the proposed architecture shows 80% better performance than [8]. the architecture outperforms all other proposed architectures as well. the on-chip area and power overhead of proposed architecture due to delay lines and MRR switch are 0.0184mm(2) and 26mW respectively.

关键词： Reservoir computing (RC) Delayed Feedback Reservoir (DFR) Recurrent Neural Network (RNN) Mach Zehnder Interferometer (MZI) Micro ring Resonator (MRR)

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