并行编译中的区域调度问题

介绍指令级并行性(ILP)中和指令级计算(EPIC)中区域的直观概念和这些概念的形式化工作，并简单介绍区域的几个调度算法，为并行编译中的区域调度问题提供一个系统的、形式化的论述。     

不确定性条件下经济开发区环境规划方法与应用研究(Ⅰ) 不确定性多目标混合整数规划模型及算法研究

以经济开发区环境规划的动态性、不确定性和多目标性为出发点,提出用不确定性多目标混合整数规划(IMOMIP)模型解决经济开发区的环境规划问题,并发展了一种基于目标偏离容忍水平(ODTL)的交互式算法,从而在模型求解过程和结果中直接反映系统的不确定性,并能有效协调不具有明显相关性的目标.     

Feedback Cache Mechanism for Dynamically Reconfigurable VLIW Processors

Very Long Instruction Word(VLIW) architectures are commonly used in application-specific domains due to their parallelism and low-power characteristics. Recently, parameterization of such architectures allows for runtime adaptation of the issue-width to match the inherent Instruction Level Parallelism(ILP) of an application.One implementation of such an approach is that the event of the issue-width switching dynamically triggers the reconfiguration of the data cache at runtime. In this paper, the relationship between cache resizing and issue-width is well investigated. We have observed that the requirement of the cache does not always correlate with the issuewidth of the VLIW processor. To further coordinate the cache resizing with the changing issue-width, we present a novel feedback mechanism to "block" the low yields of cache resizing when the issue-width changes. In this manner, our feedback cache mechanism has a coordinated effort with the issue-width changes, which leads to a noticeable improvement of the cache performance. The experiments show that there is 10% energy savings as well as a 2.3% cache misses decline on average achieved, compared with the cache without the feedback mechanism.Therefore, the feedback mechanism is proven to have the capability to ensure more benefits are achieved from the dynamic and frequent reconfiguration.     

一种网络服务器冗余容错系统在证券业中的设计与实现

介绍一种NovellHAServer集群容错系统在证券业中的应用实例设计方案 ,该方案具有较强的容错能力 ,它能令人满意地应用于证券业服务平台。     

Raft Consensus Algorithm Based on Credit Model in Consortium Blockchain

As one of the underlying technologies of the blockchain, the consensus algorithm plays a vital role in ensuring security and efficiency. As a consensus algorithm for the private blockchain, Raft has better performance than the rest of the consensus algorithms, and it does not cause problems such as the concentrated hashing power, resource waste and fork. However, Raft can only be used in a non-byzantine environment with a small network size. In order to enable Raft to be used in a large-scale network with a certain number of byzantine nodes, this paper combines Raft and credit model to propose a Raft blockchain consensus algorithm based on credit model CRaft. In the node credit evaluation phase, RBF-based support vector machine is used as the anomaly detection method, and the node credit evaluation model is constructed. Then the Trust Nodes List(TNL) mechanism is introduced to make the consensus phase in a creditable network environment. Finally, the common node is synchronized to the consensus node to update the blockchain of the entire network. Experiments show that CRaft has better throughput and lower latency than the commonly used consortium blockchain consensus algorithm PBFT(Practical Byzantine Fault Tolerance).     

基于局部信息的单播容错路由算法研究

文章提出了局部k维子交叉立方体连通性和局部子交叉立方体连通性的概念,给出交叉立方体互联网络中基于子交叉立方体结构的局部连通性容错模型.以此模型设计了局部信息的高效的单播容错路由算法(文中称之算法B),算法具有很好的通信性能和具体意义.     

Oscillation Test Strategy for Analog Filters by Monitoring Output Voltage and Supply Current

A test strategy for analog filters was proposed. The output voltage and supply current of the circuit were monitored when using the oscillation test technique. The frequency, average value, maximum value and amplitude of both output voltage and supply current were taken as test parameters. Tolerance bands of test parameters were analyzed. Fault detectabilities of test parameters were compared and combined, and optimal parameter sets were derived. Experimental results show that both the output voltage and supply current give significant contribution to fault detection. Considering catastrophic, single and double parametric faults, the fault coverage in testing the benchmark circuit can be raised from 90.6% for traditional voltageonly oscillation test strategy to 97.2% by monitoring both output voltage and current parameters.     

Data Dependence Graph Directed Scheduling for Clustered VLIW Architectures

This paper presents an instruction scheduling and cluster assignment approach for clustered very long instruction words (VLIW) processors. The technique produces high performance code by simultaneously balancing instructions among clusters and minimizing the amount of inter-cluster data communications. The scheme is evaluated based on benchmarks extracted from UTDSP. Results show a significant speedup compared with previously used techniques with speed-ups of up to 44%, with average speed-ups ranging from 14% (2-cluster) to 18% (4-cluster).     

通用海量数据库性能测试系统的设计与实现

为客观反映数据库实际运行性能,设计一种可配置数据库性能测试标准,它能够针对具体应用数据库系统,建立相应的控制模型、数据模型和事务处理模型。控制模型描述数据库的运行模式,数据模型描述用户访问数据库的数据集合,事务处理模型描述用户访问数据库的行为模式。控制模型通过事务处理模型和数据模型组装动态SQL(standardquery language)语句,然后产生多个并发进程模拟大量实际用户访问数据库,以测试数据库的运行状况和性能。分析与实际测试结果表明,该系统能够根据实际应用系统配置数据库性能测试标准,较之目前国际上通用的固定模型测试标准如TPC-C等,更能够客观反映数据库实际运行性能。     

高性能处理器中干扰公平队列I/O调度器

高性能处理器和系统需要高存储带宽和高效的外部I/O处理,需要同时服务吞吐率密集应用和延迟敏感应用,给多道程序计算机系统和多租户模式的超级计算机系统的公平性带来巨大的挑战。针对这两类应用共享SSD (solid-state disks)等可并发的存储设备问题,开发一款基于队列的干扰公平(interference fair queueing,IFQ)调度器。在Linux操作系统实现IFQ调度器,并与其他调度器进行对比,包括Linux的CFQ调度器、STF调度器、MFAP的时间片流转调度器和MFAP的短时间片流转调度器。基于合成工作集、访问踪迹工作集和真实应用工作集的结果显示, IFQ调度器可以同时保证公平性和响应延迟。     

对模拟退火算法解不均匀性的改善

模拟退火算法(SA)是一种对复杂的组合问题很有效的最优化算法,例如LSI设计中的布局设计,但模拟退火算法需要很长的执行时间,所以许多的研究者都在研究更快的模拟退火技术.在观察到模拟退火算法得到的结果可能会产生不均匀性,并且在几个简单集成模块布局问题的实验中发现这种不均匀性超过了30%,由此提出了一个改善SA算法结果的方法,称之为TOSA算法.通过对标准布局问题的实验,证明了SA算法结果的不均匀性和TOSA算法的有效性.在应用TOSA算法对8个全局标准布局问题IBM01～IBM02和IBM07～IBM12进行的布局实验中,相较于原始的模拟退火算法,在解的质量上获得了平均4%～7%的改善.     

基于耦合模型的广东省生态系统健康时空动态变化

探究广东省2009-2019年的生态系统健康时空动态变化特征,可为广东省社会经济与生态系统健康可持续发展提供数据支持与理论参考。本文基于VOR模型耦合生态服务系统价值并采用最小二乘法优化组合赋权方法构建新的多指标评价体系,对广东省2009-2019年的生态系统健康状况进行评价与分析。结果表明：(1)广东省近11年来生态系统健康状况整体处于二级亚健康及以下水平,呈现北部内陆地区优于南部沿海地区的空间分布特征;(2) )广东省近11年来生态系统健康等级变化主要在二级和三级之间相互转化,生态系统健康等级为二级的区域面积占比呈现起伏状态。处于二级亚健康水平的区域面积占比在2015年、2016年和2018年高达50%以上,生态系统健康状况最好;而2009-2011年以及2019年处于二级亚健康水平的区域面积占比不到30%,生态系统健康状况有变差的趋势。(3)广东省在2009-2019年间生态系统健康状况处于改善的区域面积比退化的区域高4.79%,但2014-2019年间相较于2009-2014年间生态系统健康等级退化的区域面积占比上升23.05%,生态系统健康状况在2014-2019年间出现明显恶化,呈现由二级亚健康水平向三级一般健康水平转化趋势。研究结果从时间和空间上定量分析 2009-2019 年广东省生态系统健康状况,根据南北地区生态系统健康状况差异提出相应政策建议,对推动广东省生态文明建设协调发展具有实际意义。     

基于着色器的LOD纹理混合与反走样平滑过渡关键技术研究

针对场景切换时产生的LOD(level of detail)纹理突变和走样问题,提出一种基于着色器的LOD纹理混合与反走样平滑过渡算法.该算法根据三维模型和视点的距离,运用基于Alpha测试的不透明蒙版算法和加权邻帧反走样算法,在LOD间生成过渡材质,实现三维模型LOD切换的平滑过渡,不仅能够改善纹理质量,而且能够保证...     

SHCSP与AFP检测肝癌研究

本文用SHCSP与AFP检测原发性肝癌126例,转移性肝癌6例,非肝癌患者141例,SHCSP法诊断敏感性90.48％,特异性90.07％,诊断效率90.26％,阳漏本9.52％,假阳性9.93％,LR(+)=9.11,LR(-)=0.11。而AFP法诊断敏感性70.63％,特异位88.65％,诊断效率80.15％,阳漏率29.37％,假阳性11.35％,LR(+)=6.22,LR(-)=0.33,检测SHCSP诊断肝癌比AFP优,且有非常显著性差别(P<0. 01),两法在诊断肝癌和排除肝癌有互补性,应联合检测,以提高肝癌诊断率。     

政治文件中的排比现象

政治文件中的排比的类型可以分为:语素排比、词排比、短语排比、分句或单句排比、复句排比、句群排比等类型。排比在此类文件中能清晰地表达思想,加强语势,从而大大地提高了表达效果。     

一个Java自适应优化编译框架的设计与实现

给出一个主要针对Java高性能应用的Java自适应优化编译框架.它具有分布式系统结构,采用一个启发式算法搜索一个很大而复杂的优化空间以提高被编译程序的运行性能.在两个测试环境下测试16个测试程序的结果表明:它在测试100个点后能取得平均加速比为1.14和1.10,并且其中的78%和89%在头20次测试中即可获得.     

More Bang for Your Buck: Boosting Performance with Capped Power Consumption

Achieving faster performance without increasing power and energy consumption for computing systems is an outstanding challenge. This paper develops a novel resource allocation scheme for memory-bound applications running on High-Performance Computing(HPC) clusters, aiming to improve application performance without breaching peak power constraints and total energy consumption. Our scheme estimates how the number of processor cores and CPU frequency setting affects the application performance. It then uses the estimate to provide additional compute nodes to memory-bound applications if it is profitable to do so. We implement and apply our algorithm to 12 representative benchmarks from the NAS parallel benchmark and HPC Challenge(HPCC)benchmark suites and evaluate it on a representative HPC cluster. Experimental results show that our approach can effectively mitigate memory contention to improve application performance, and it achieves this without significantly increasing the peak power and overall energy consumption. Our approach obtains on average 12.69% performance improvement over the default resource allocation strategy, but uses 7.06% less total power, which translates into 17.77% energy savings.     

饶阳凹陷马西断层封闭性评价

 断层封闭性研究对于确定油气藏的分布具有重要意义。针对断层两盘的岩性配置关系、泥岩涂抹分析、断裂充填物泥质含量分析、断层活动期与油气运移成藏期的配置和断面力学性质等影响因素的特征,对饶阳凹陷马西断层的断层封闭性进行分析,最后应用综合评价方法进行综合判断。结果表明,古近纪中晚期马西断层活动强烈,封闭性较差,正好与本区的油气运移成藏期相配合,为油藏的形成提供了有效的运移通道;新近纪至今,断层长期停止活动,且其封闭性表现出“上好下差”的特点,对本区沙河街组油藏的保存具有重要意义。     

贵州地震的分布特征

根据地震分布密度、控制地震发生的构造的差异,将贵州地震平面分布划分为威宁—晴隆区（A区）、遵义—贵阳区（B区）和铜仁—榕江区（C区）3个区;A区和B区以垭都—紫云断层为界,B区和C区以松桃—独山断层为界;A区、B区和C区的地震分布分别为80%、15%和5%。贵州地震震源深度显示都属于浅源地震,总体主要集中在7～11km;B区分布在30km以浅深度内;A区主要在20km以浅深度内,在20～70km也有地震发生。1900年～1975年,4级以上地震活跃期为1906～1919,1928～1941,1948～1955,1963～1974;1975～2011年,3级以上地震活跃期为1978～1989,1993～2000,2003～2011。     

E级计算之远景

 超级计算机在当今科技发展中占有举足轻重的地位。在向着E级计算时代迈进之时,精确衡量超算的性能是一个事关超算架构和应用的关键问题。评价一台超算采用不同的基准会产生不同的结果。本文介绍超算中主要的3种排名及其对应的评测基准,并分析了超算本身的发展及应用远景。