一种新的处理能力优先的权值分配调度算法

针对加权最小连接数算法中服务节点权值不准确而直接影响负载均衡效率和整个集群系统性能的问题, 提出一种新的改进算法--处理能力优先的权值分配调度算法. 给出了改进算法的工作流程和要点, 分析并设计了算法的主要技术、 主要模块及原理. 实验结果表明: 该算法解决了LVS(Linux virtual server)负载调度的负载不平衡问题, 提高了LVS集群的性能和稳定性; 改进算法比加权最小连接数算法具有更优化的动态平衡性.     

基于负载均衡的任务调度算法

基于传统任务调度算法, 通过在调度过程中增设服务器最佳期望序列及负载均衡指数, 采用任务连接数约束服务器选择, 解决了传统任务调度算法对于集群负载均衡性能的忽略问题. 实验结果表明, 该改进算法能达到较高负载均衡度, 同时缩短任务完成时间, 并提高了集群对于批量级任务的处理能力, 从而达到了优化的目的.     

智能负载均衡技术在高负荷网站上的应用

某些网站存在访问规模大并且时间上密集,导致Web服务器不堪重负的问题。基于LVS项目,给出了采用DR模式的Web集群解决方案,针对LVS自带的加权最小连接数算法的权值不能反映服务器实时负载能力,提出并实现了全动态智能加权最小连接数算法,测试了该算法的实际使用性能。     

云中心基于Nginx的动态权重负载均衡算法

为了解决云中心的服务器端在高并发情况下各节点的负载失衡问题,在对负载均衡技术Nginx自带的负载均衡策略和主流的负载均衡策略进行研究、分析的基础上,提出了一种动态调节权重的负载均衡策略.该策略基于加权轮询策略进行改进,同时考虑服务器的本身硬件性能与工作时的负载情况,设计了静态权值和动态权值的计算方法,将两者结合得到节点最终权值.静态权值主要考虑了各服务器的硬件性能情况,动态权值的计算则是收集各后端服务器节点工作时的CPU利用率、内存利用率、网络性能情况及磁盘I/O等性能情况,由此,动态地调节各后端服务器节点权重.测试结果表明,相较于原加权轮询算法,该算法在高并发情况下的响应时间和实际并发数等方面表现更好.     

一种基于自适应权值的负载均衡算法

网络集群环境下的负载均衡优化问题是一个各种软、硬件参数优化整合的结果。首先针对加权轮询算法和加权最少连接数算法的实现原理进行分析,得出两种典型算法的不足。再提出一种基于自适应权值的负载均衡算法。并利用OP-NET软件对上述3种算法进行仿真对比,证明新算法在CPU的利用率、服务器负载、服务延迟等方面都优于已有算法。     

基于Nginx负载均衡的动态分配技术研究

伴随互联网的迅猛发展,人们对服务器的访问量也越来越大,最终导致某些负载均衡器的负载分配技术并不能较好地实现动态负载均衡,本文基于反向代理服务器内置的负载均衡算法,对其进行分析和研究,最后对其内置的一种加权轮询算法进行改进,提出一种动态负载均衡算法,该算法使用memcache缓存机制,能实时地对后端服务器cpu利用率、网络利用率、请求响应时间等性能进行收集、并通过熵值法确各项指标的系数以及动态修改后端服务器的权值。通过多组实验进行验证的实验结果表明,该算法在请求响应时间以及吞吐量等方面表现的更好。     

一种改进的基于LVS的负载均衡策略

负载均衡策略对提高集群系统服务效率至关重要.本文介绍了一种改进的LvS集群系统的加权最小连接调度策略,将原算法中的静态权值优化为动态权值,并通过实验证明,新调度策略能有效减少服务器的负载倾斜.     

基于最小负载的Linux Web机群负载均衡算法

为了充分发挥Web机群后端服务器的实际处理能力,实现了一种基于最小负载的Web机群负载均衡算法.该算法依据后端服务器的实际状态:CPU使用率、内存使用率、网络利用率和磁盘性能,通过定时获取后端服务器的状态信息,导出服务器综合负载并放大取整,作为服务器权值.基于最小负载的均衡算法能够动态反馈,具有自适应特性.与加权轮转调度算法相比,基于最小负载的调度算法具有更高的请求成功数和较低的请求失败数.     

高振斌1,潘亚辰1,华 中2,段小红2,赵丹2

酒店智能终端系统中,为了解决随着终端用户数量的增加导致的服务器负载过重从而用户体验下降的问题,提出了一种改进的加权最小连接调度算法的负载均衡技术,将连接个数作为负载因子进行综合考虑,使得新加入的终端用户能够自动在多云分支服务器之间做出最佳决策,选取当前周期内负载最轻的一台服务器进行自动连接并实现整个酒店智能系统的负载均衡。实验结果表明,利用改进算法可以使得酒店智能终端机顶盒与多云分支服务器的自动连接实现整个系统的负载均衡且具有良好的稳定性,达到了预期效果。     

改进的基于加权最小连接数的负载均衡算法

酒店智能终端系统中,为了解决随着终端用户数量的增加导致的服务器负载过重从而用户满意度下降的问题,提出了一种改进的加权最小连接调度算法的负载均衡技术,将连接个数作为负载因子进行综合考虑,使得新加入的终端用户能够自动在多云分支服务器之间做出最佳决策,选取当前周期内负载最轻的一台服务器进行自动连接并实现整个酒店智能系统的负载均衡。实验结果表明,利用改进算法可以使得酒店智能终端机顶盒与多云分支服务器的自动连接实现整个系统的负载均衡且具有良好的稳定性,达到了预期效果。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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