Somatic hypermutation (or SHM) is a cellular mechanism by which the immune system adapts to the new foreign elements that confront it (e.g. microbes), as seen during class switching. Somatic hypermutation - Wikipedia en.wikipedia.org/wiki/Somatic_hyp…

MEMORY_TARGET参数在Oracle 11g被引进,主要是用于控制Oracle对于系统内存的使用,首次将SGA与PGA整合到一起实现自动管理.一旦设置了MEMORY_TARGET参数值,Oracle会根据需要自动调整SGA与PGA以合理的分配及使用内存.但如果MEMORY_TARGET设置不当,就容易引起ORA-00845,因为MEMORY_TARGET与/dev/shm(tempfs)息息相关,本文即是对由此引发问题的描述. 1.故障现象[oracle@linux1 catadb]$…

引言 - ipc - shm 共享内存 本文会通过案例了解ipc 的共享内存机制使用, 后面会讲解C 如何使用外部内存服务memcached. 好先开始了解 linux 共享内存机制. 推荐先参看下面内容回顾一下 共享内存 linux api. linux进程间的通信(C): 共享内存    http://blog.chinaunix.net/uid-26000296-id-3421346.html 上面文章可以简单看一下概念.  下面这篇文章好些, 可以细看加深共享内存api使用熟练度. Li…

BACKGROUND The present disclosure relates generally to information processing systems and, more specifically, to a mechanism that maintains the architectural state values for both active and inactive software threads that may be executed on a process…

BACKGROUND Typically, a multithreaded processor or a multi-processor system is capable of processing multiple instruction sequences concurrently. A primary motivating factor driving execution of multiple instruction streams within a single processor…

/dev/shm是Linux下的一个目录,/dev/shm目录不在磁盘上,而是在内存中,因此使用Linux /dev/shm的效率非常高,直接写进内存 可以通过两个脚本验证Linux /dev/shm的性能 [root@db1 oracle]# ls -l linux_11gR2_grid.zip -rw-r--r-- 1 oracle dba 980831749 Jul 11 20:18 linux_11gR2_grid.zip [root@db1 oracle]# cat mycp.sh #…

原文网址:http://blog.csdn.net/longxibendi/article/details/6048231 1.网址: http://www.mjmwired.net 2.比如查看这个 proc.txt ,就在这里能找到. http://www.mjmwired.net/kernel/Documentation/filesystems/proc.txt 内核参数解释全在这里了.不过,也可以下载内核完源代码,从/usr/src/linux/Documentation/proc.tx…

android 使用 linux 内核,一般运行在 ARM 体系架构上,android 设备启动的过程,应用层之下基本等同于linux, 从应用层第一个程序init开始有所区别,下面开始介绍. step1, boot rom 主要作用是加载 boot loader 进入内存并执行,boot rom 一般固化在芯片上,设备启动加电自检后从固定的地址开始执行 step2,boot loader 分2步执行,boot rom只加载了第一部分bootloader代码进入内存,这部分代码随即加载第二部分b…

An apparatus and method is described herein for providing robust speculative code section abort control mechanisms. Hardware is able to track speculative code region abort events, conditions, and/or scenarios, such as an explicit abort instruction, a…

Aspects of the present invention are directed at centrally managing the allocation of memory to executable images in a way that inhibits malware from identifying the location of the executable image. Moreover, performance improvements are implemented…

A computing system is operable to contain a security module within an operating system. This security module may then act to monitor access requests by a web browser and apply mandatory access control security policies to such requests. It will be ap…

In particular embodiments, a method includes, from an indexer in a sensor network, accessing a set of sensor data that includes sensor data aggregated together from sensors in the sensor network, one or more time stamps for the sensor data, and metad…

这里介绍在Red Hat Enterprise Linux Server release 5.7 (Tikanga)下安装ORACLE 11.2.0.1.0的过程,本文仅仅是为了写这样安装指导文档而整理在此.仅供参考! 1:下载对应平台的ORACLE 11g安装介质 安装ORACLE,首先要获取安装介质,大部分情况手头都有相关版本的安装介质.如果你手头没有安装介质,那么可以从下面链接获取对应平台的ORACLE安装介质. http://www.oracle.com/technetwork/data…

COMPUTER ORGANIZATION AND ARCHITECTURE DESIGNING FOR PERFORMANCE NINTH EDITION Figure 17.4 depicts in general terms the organization of a multiprocessor system. There are two or more processors. Each processor is self-contained, including a control u…

第一章 准备 1.1.    环境配置 _NT_DEBUGGER_EXTENSION_PATH=C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727 _NT_SYMBOL_PATH=SRV*c:\Symbols*http://msdl.microsoft.com/download/symbols Path add: C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727 C:\Program Files\Debugging…

1 Sap的更新的类型 在sap中,可以使用CALL FUNCTION ... IN UPDATE TASK将多个数据更新绑定到一个database LUW中.程序使用COMMIT WORK提交修改请求.在sap中将更新分四种类型: 1.1 Asynchronous Update(异步更新):在这种情况,调用程序提交事务不需要等待Update Work Process完成数据更新处理. 1.2 Updating Asynchronously in Steps(多步异步更新): 这种更新分两步.…

In the Java community there's been a rush of lightweight containers that help to assemble components from different projects into a cohesive application. Underlying these containers is a common pattern to how they perform the wiring, a concept they r…

http://www.onjava.com/pub/a/onjava/2001/05/30/optimization.htmlComparing the performance of LinkedLists and ArrayLists (and Vectors) (Page last updated May 2001, Added 2001-06-18, Author Jack Shirazi, Publisher OnJava). Tips: ArrayList is faster than…

3.10. ArraysAn array is a data structure that stores a collection of values of the same type. You access each individual value through an integer index. For example, if a is an array of integers, then a[i] is the ith integer in the array.Declare an a…

Inversion of Control Containers and the Dependency Injection pattern --Martin Fowler 本文内容 Component and Service(组件和服务) A Naive Example(一个超级简单的例子) Inversion of Control(控制反转) Forms of Dependency Injection(依赖注入的几种形式) Constructor Injection with PicoConta…

Oracle 11g Redhat 5安装  一.检查硬件是否满足要求 检查一内存 On Linux x86: At least 1 GB of RAM 内存至少1G To determine the RAM size, enter the following command: # grep MemTotal /proc/meminfo If the size of the RAM is less than the required size, then you must install mor…

转自:http://www.vogella.com/tutorials/Git/article.html#git_rename_branch Lars Vogel Version 5.8 Copyright © 2009-2015 vogella GmbH 10.08.2015 Git Tutorial This tutorial explains the usage of the distributed version control system Git via the command li…

IP, TCP, and HTTP Issue #10 Syncing Data, March 2014 By Daniel Eggert When an app communicates with a server, more often than not, that communication happens over HTTP. HTTP was developed for web browsers: when you enter http://www.objc.io into your…

A context switch (also sometimes referred to as a process switch or a task switch) is the switching of the CPU (central processing unit) from one process or thread to another. A process (also sometimes referred to as a task) is an executing (i.e., ru…

https://msdn.microsoft.com/en-us/library/ff647787.aspx Retired Content This content is outdated and is no longer being maintained. It is provided as a courtesy for individuals who are still using these technologies. This page may contain URLs that we…

本文转载自 http://www.ietf.org/rfc/rfc3261.txt 中文翻译可参考 http://wenku.baidu.com/view/3e59517b1711cc7931b71654.html Network Working Group J. Rosenberg Request for Comments: 3261 dynamicsoft Obsoletes: 2543 H. Schulzrinne Category: Standards Track Columbia U.…

  In the programs seen in previous chapters, all memory needs were determined before program execution by defining the variables needed. But there may be cases where the memory needs of a program can only be determined during runtime. For example, wh…

Java™ Platform, Standard Edition 7API Specification This document is the API specification for the Java™ Platform, Standard Edition. See: Description Packages  Package Description java.applet Provides the classes necessary to create an applet and the…

本课主题 Linux 休系结构图 Linux 系统启动的顺序 Linux 查看内存和 CPU 指令 环境变量加载顺序 Linux 内存结构 Linux 休系结构图 Linux 大致分为三个层次,第一层是就是 用户空间层,就是离我们最近的层,它一般有Shell和应用程序,大数据基乎所有的应用软件都在用户空间层,另外就是核心层,它是 Linux 的内核,它负责与硬件进行交互,为系统的用户空间提供服务.为了不让用户空间直接访问内核的地址空间,它做了限制,加了一层 System Call,防止系统当机.…

common-logging源码Log接口 在common-logging的源码中,将log核心类抽象成了一个Log接口. 这里贴出Log接口的源码: /* * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional info…