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Timed Petri Net Models of shared-memory Bus-Based Multiprocessors

Journal of Computer and Communications 2018年第10期6卷 1-14页

作者： Wlodek M. Zuberek Department of Computer Science Memorial University St. John’s Canada

In shared-memory bus-based multiprocessors, when the number of processors grows, the processors spend an increasing amount of time waiting for access to the bus (and shared memory). This contention reduces the performance of processors and imposes a limitation of the number of processors that can be used efficiently in bus-based systems. Since the multi-processor’s performance depends upon many parameters which affect the performance in different ways, timed Petri nets are used to model shared-memory bus-based multiprocessors at the instruction execution level, and the developed models are used to study how the performance of processors changes with the number of processors in the system. The results illustrate very well the restriction on the number of processors imposed by the shared bus. All performance characteristics presented in this paper are obtained by discrete-event simulation of Petri net models.

关键词： shared-memory Multiprocessors Bus-Based Multiprocessors Timed Petri Nets Discrete-Event Simulation

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Efficient computation of Hash Hirschberg protein alignment utilizing hyper threading multi-core sharing technology

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CAAI Transactions on Intelligence Technology 2022年第2期7卷 278-291页

作者： Muhannad Abu-Hashem Adnan Gutub Department of Geomatics Faculty of Architecture and PlanningKing Abdulaziz UniversityJeddahSaudi Arabia Department of Computer Engineering College of Computer&Information SystemsUmm Al-Qura UniversityMakkahSaudi Arabia

Due to current technology enhancement,molecular databases have exponentially grown requesting faster efficient methods that can handle these amounts of huge ***-fore,Multi-processing CPUs technology can be used including physical and logical processors(Hyper Threading)to significantly increase the performance of ***,sequence comparison and pairwise alignment were both found contributing significantly in calculating the resemblance between sequences for constructing optimal *** research used the Hash Table-NGram-Hirschberg(HT-NGH)algo-rithm to represent this pairwise alignment utilizing hashing *** authors propose using parallel shared memory architecture via Hyper Threading to improve the performance of molecular dataset protein pairwise *** proposed parallel hyper threading method targeted the transformation of the HT-NGH on the datasets decomposition for sequence level efficient utilization within the processing units,that is,reducing idle processing unit *** authors combined hyper threading within the multicore architecture processing on shared memory utilization remarking perfor-mance of 24.8%average speed up to 34.4%as the highest boosting *** benefit of this work improvement is shown preserving acceptable accuracy,that is,reaching 2.08,2.88,and 3.87 boost-up as well as the efficiency of 1.04,0.96,and 0.97,using 2,3,and 4 cores,respectively,as attractive remarkable results.

关键词： computational biology high-performance computing Hyper Threading pairwise sequence alignment parallel design sequence alignment shared-memory

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Multi-core based parallel computing technique for content-based image retrieval

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Journal of Shanghai University(English Edition) 2010年第1期14卷 55-59页

作者：陈文浩方昱春姚继锋张武 School of Computer Engineering and Science Shanghai University Shanghai Supercomputer Center High Performance Computing Center Shanghai University

In this paper, we propose a parallel computing technique for content-based image retrieval （CBIR） system. This technique is mainly used for single node with multi-core processor, which is different from those based on cluster or network computing architecture. Due to its specific applications （such as medical image processing） and the harsh terms of hardware resource requirement, the CBIR system has been prevented from being widely used. With the increasing volume of the image database, the widespread use of multi-core processors, and the requirement of the retrieval accuracy and speed, we need to achieve a retrieval strategy which is based on multi-core processor to make the retrieval faster and more convenient than before. Experimental results demonstrate that this parallel architecture can significantly improve the performance of retrieval system. In addition, we also propose an efficient parallel technique with the combinations of the cluster and the multi-core techniques, which is supposed to gear to the new trend of the cloud computing.

关键词： content-based image retrieval (CBIR) parallel computing shared-memory feature extraction similarity comparison

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片上双核通信机制的设计与应用

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微电子学 2007年第1期37卷 28-32页

作者：杨建阳晔严晓浪葛海通浙江大学超大规模集成电路设计研究所浙江杭州310027

高性能处理器之间的通信是片上多核系统设计的关键。文章描述了片上RISC/DSP双核系统Gemini中Mailbox、shared-memory、DMA三种通信机制的设计,并通过通信实验,测试各自的通信延迟和带宽;在Xilinx FPGA上实现了Gemini系统,当系统运行于4... 详细信息

高性能处理器之间的通信是片上多核系统设计的关键。文章描述了片上RISC/DSP双核系统Gemini中Mailbox、shared-memory、DMA三种通信机制的设计,并通过通信实验,测试各自的通信延迟和带宽;在Xilinx FPGA上实现了Gemini系统,当系统运行于40 MHz时,采用上述通信机制的OggVorbis解码软件能够在uCLinux操作系统的控制下实现实时解码。

关键词：片上双核系统进程问通信 Mailbox shared-memory DMA

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