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排序方式: 共有62条查询结果,搜索用时 31 毫秒
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针对超标量处理器中长周期执行指令延迟退休及持续译码导致的重排序缓存(ROB)阻塞问题,提出一种指令乱序提交机制。通过设计容量可配置的多缓存指令提交结构,实现存储器操作指令和ALU类型指令的分类退休,根据超标量处理器架构及性能需求对目标缓存和存储缓存容量进行参数化配置降低流水线阻塞风险,同时利用指令目的寄存器编码提交模式加快指令提交速率。实验结果表明,该机制提高了单次指令提交数量,基于该机制的超标量处理器相比传统基于ROB顺序提交机制的超标量处理器在减少硬件开销的情况下平均IPC指数提升46%,相比基于值预测、乱序退休和组提交的超标量处理器平均IPC指数增益为19%,综合性能更优。 相似文献
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A concept for a future integer arithmetic unit suitable for a realization with 3-D optoelectronic very large scale integrated (VLSI) circuits is presented. Due to the use of optical interconnections running vertically to the circuit's surface no pin limitation is given. This allows massively parallelism and a higher throughput performance than in all-electronic solutions. To exploit the potential of optical interconnections in VLSI systems efficiently well-adapted low-level algorithms and architectures have to be developed. This is demonstrated for a pipelined arithmetic unit using a redundant number representation. A transistor layout for the optoelectronic circuits is given as well as a specification for the necessary optical interconnection scheme linking the circuits with free-space optics. It is shown that the throughput can be increased by a factor of 10 to 50 compared to current all-electronic processors by considering state-of-the-art optical and optoelectronic technology. Furthermore we present results we gained by investigations on a first realized optoelectronic VLSI test chip. 相似文献
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Determining a tight WCET of a block of code to be executed on a modern superscalar processor architecture is becoming ever more difficult due to the dynamic behaviour exhibited by current processors, which include dynamic scheduling features such as speculative and out-of-order execution in the context of multiple execution units with deep pipelines. We describe the use of Coloured Petri Nets (CP-nets) in a simulation based approach to this problem. A complex model of a generic processor architecture is described, with emphasis on the modelling strategy for obtaining the WCET and an analysis of the results. 相似文献
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存储器访问延迟已经成为高性能微处理器性能发挥的关键障碍之一。预取是隐藏访存延迟的重要手段。其通常做法是显式执行指令将数据在实际使用前先和取到离微处理器附近的地方,但是这种方法增加了程序设计人员的负担。本文提出了一种硬件预取方法,即在存储控制器中设计一个VPFB机构用来隐藏访存延迟,并通过模拟分析了它的效果。 相似文献
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为解决嵌入式领域对处理器不同性能面积的需求,以及对重排序缓冲区阻塞,保留站派遣长短周期指令时导致的吞吐率不平衡及堵塞问题,设计并优化了一种简便配置的参数化流水线超标量处理器.通过定制化流水线中的分支预测,缓存与运算单元,将RISC-V指令划分5大类处理,对不同周期的执行单元采用级联与并行的混合分布方式,将充当排序缓存中... 相似文献
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Leonid Oliker Andrew Canning Jonathan Carter John Shalf David Skinner Stphane Ethier Rupak Biswas Jahed Djomehri Rob Van der Wijngaart 《Concurrency and Computation》2005,17(1):69-93
The growing gap between sustained and peak performance for scientific applications is a well‐known problem in high‐performance computing. The recent development of parallel vector systems offers the potential to reduce this gap for many computational science codes and deliver a substantial increase in computing capabilities. This paper examines the intranode performance of the NEC SX‐6 vector processor, and compares it against the cache‐based IBM Power3 and Power4 superscalar architectures, across a number of key scientific computing areas. First, we present the performance of a microbenchmark suite that examines many low‐level machine characteristics. Next, we study the behavior of the NAS Parallel Benchmarks. Finally, we evaluate the performance of several scientific computing codes. Overall results demonstrate that the SX‐6 achieves high performance on a large fraction of our application suite and often significantly outperforms the cache‐based architectures. However, certain classes of applications are not easily amenable to vectorization and would require extensive algorithm and implementation reengineering to utilize the SX‐6 effectively. Copyright © 2005 John Wiley & Sons, Ltd. 相似文献
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This work focuses on the use of computational Grids for processing the large set of jobs arising in parameter sweep applications. In particular, we tackle the mapping of molecular potential energy hypersurfaces. For computationally intensive parameter sweep problems, performance models are developed to compare the parallel computation in a multiprocessor system with the computation on an Internet‐based Grid of computers. We find that the relative performance of the Grid approach increases with the number of processors, being independent of the number of jobs. The experimental data, obtained using electronic structure calculations, fit the proposed performance expressions accurately. To automate the mapping of potential energy hypersurfaces, an application based on GRID superscalar is developed. It is tested on the prototypical case of the internal dynamics of acetone. Copyright © 2006 John Wiley & Sons, Ltd. 相似文献