SUMMARY OF THE INVENTION The present invention pertains to a write combining buffer for use in a microprocessor. The microprocessor fetches data and instructions which are stored by an external main memory. The data and instructions are sent over a b…

现代CPU使用了很多技术来降低对内存存取数据的延时,因为CPU执行的速度实在是太快了,在从内存存取数据的约120ns中,可以执行数百条指令. 其中多级的缓存架构就是为了减少这种延时,来提高CPU的利用率. 在SMP系统使消息传递协议来保证缓存的一致性.但是CPU运行实在是太快了,人类总是很贪婪,想尽各种办法榨取CPU的性能,因此在缓存体系统,还存在的其它一些不怎么被人熟悉的Buffer. 这其中有Write back buffer, Line fill buffer, 而本文要介绍的是Write…

BACKGROUND OF THE INVENTION The use of a cache memory with a processor facilitates the reduction of memory access time. The fundamental idea of cache organization is that by keeping the most frequently accessed instructions and data in the fast cache…

An improved memory model and implementation is disclosed. The memory model includes a Total Store Ordering (TSO) and Partial Store Ordering (PSO) memory model to provide a partial order for the memory operations which are issued by multiple processor…

A speculative store buffer is speculatively updated in response to speculative store memory operations buffered by a load/store unit in a microprocessor. Instead of performing dependency checking for load memory operations among the store memory oper…

前一段时间学习了python当中的装饰器,主要利用了闭包的原理.后来呢,又见到了python当中的functools模块,里面有很多实用的功能.今天我想分享一下跟装饰器息息相关的两个函数partial和wraps,这两个好伙伴可以说是非常实用. 1 partial偏函数: 这个函数可以帮助我们对一个接收多个参数的函数绑定其中几个参数,返回一个对象,调用这个对象的时候只传给他剩下的参数就可以.它实现了好像闭包才能实现的功能.有的时候可以代替闭包来使用. 不理解??没关系,听我慢慢说! 比如,我们现…

一.什么是insert buffer insert buffer是一种特殊的数据结构(B+ tree)并不是缓存的一部分,而是物理页,当受影响的索引页不在buffer pool时缓存 secondary index pages的变化,当buffer page读入buffer pool时,进行合并操作,这些操作可以是 INSERT, UPDATE, or DELETE operations (DML) 最开始的时候只能是insert操作,所以叫做insert buffer,现在已经改叫做chang…

Beej's Guide to Network Programming Using Internet Sockets Brian "Beej Jorgensen" Hallbeej@beej.us Version 3.0.15July 3, 2012 Copyright © 2012 Brian "Beej Jorgensen" Hall Contents 1. Intro 1.1. Audience 1.2. Platform and Compiler 1.3. …

http://wiki.nginx.org/HttpLuaModule#Directives Name ngx_lua - Embed the power of Lua into Nginx This module is not distributed with the Nginx source. See the installation instructions. Status This module is under active development and is production…

1. CentOS系统安装openresty 你可以在你的 CentOS 系统中添加 openresty 仓库,这样就可以便于未来安装或更新我们的软件包(通过 yum update 命令).运行下面的命令就可以添加我们的仓库: $ sudo yum install yum-utils $ sudo yum-config-manager --add-repo https://openresty.org/package/centos/openresty.repo 然后就可以像下面这样安装软件包,比如…

Unicode Chart Range Decimal Name 0x0000-0x007F 0-127 Basic Latin 0x0080-0x00FF 128-255 Latin-1 Supplement 0x0100-0x017F 256-383 Latin Extended-A 0x0180-0x024F 384-591 Latin Extended-B 0x0250-0x02AF 592-687 IPA Extensions 0x02B0-0x02FF 688-767 Spacing…

一. 软件平台与硬件平台 软件平台: 1.操作系统:Windows-8.1 2.开发套件:ISE14.7 3.仿真工具:ModelSim-10.4-SE .ChipScope 硬件平台: 1. FPGA型号:Xilinx公司的XC6SLX45-2CSG324 2. EEPROM型号:Microchip公司的AT24LC04B 二. 原理介绍 IIC(Inter-Integrated Circuit)总线是一种由PHILIPS公司开发的两线式串行总线,用于连接微控制器及其外围设备.I2C总线产生于…

A processor employing a post-cache (LS2) buffer. Loads are stored into the LS2buffer after probing the data cache. The load/store unit snoops the loads in the LS2 buffer against snoop requests received from an external bus. If a snoop invalidate requ…

CreateFile函数详解 CreateFile The CreateFile function creates or opens the following objects and returns a handle that can be used to accessthe object: files pipes mailslots communications resources disk devices(Windows NT only) consoles directories(open…

The information in this document is useful if you are trying to programmatically find a built-in command, menu, or toolbar. The ICommandBars::Find and ICommandBar::Find methods can be used to get a reference to a specific toolbar, menu, or command. B…

To speed up bulk loading of data, InnoDB implements an insert buffer, a special index in the InnoDB system tablespace that buffers modifications to secondary indexes when the leaf pages are not in the buffer pool. Batched merges from the insert buffe…

Socket and Host Configuration This set of directives will allow you to configure your virtual hosts. In practice, this materializes by creating server blocks that you identify either by a hostname or by an IP address and port combination. In addition…

CreateFile函数详解 CreateFile The CreateFile function creates or opens the following objects and returns a handle that can be used to accessthe object: files pipes mailslots communications resources disk devices(Windows NT only) consoles directories(open…

Working with Strings By Steven Feuerstein  Part 3 in a series of articles on understanding and using PL/SQL Every application needs data. That seems rather obvious, doesn’t it? An application is almost always built on top of database tables. Those ta…

一. ORA-600 概述 Errorsof the form ORA-600 are called internal errors. This section clarifies themisunderstanding of ORA-600s being synonymous with corruption. An ORA-600 usually has up to five arguments associated withit which gives Oracle support and…

CreateFile The CreateFile function creates or opens the following objects and returns a handle that can be used to accessthe object: files pipes mailslots communications resources disk devices(Windows NT only) consoles directories(open only) CreateFi…

CreateFileThe CreateFile function creates or opens the following objects and returns a handle that can be used to accessthe object: files pipes mailslots communications resources disk devices(Windows NT only) consoles directories(open only) CreateFil…

Freescale MX51平台的透明处理根据bpp(bits_per_pixel)不同,处理方式有所不同. 透明处理涉及到两个图层的合并,这个合并操作是MX51 IPU的DP(Display process)模块来进行的. 下图为mx51 datasheet中的DP 微观架构图 上图的中Combining Unit就是用来实现两个图层的合并,DP有两个input FIFOs用来传输full 图层和partial图层的数据.在传入Combining Unit之前,还会做CSC(Color spa…

稳定性: 2 - 不稳定 流是一个抽象接口,在 Node 里被不同的对象实现.例如request to an HTTPserver 是流,stdout 是流.流是可读,可写,或者可读写.所有的流是 EventEmitter 的实例. 你可以通过 require('stream') 加载 Stream 基类.其中包括了 Readable 流.Writable 流.Duplex 流和 Transform 流的基类. 这个文档分为 3 个章节.第一个章节解释了在你的程序中使用流时候需要了解的部分.如果…

twisted网络框架的三个基础模块:Protocol, ProtocolFactory, Transport.这三个模块是构成twisted服务器端与客户端程序的基本.Protocol:Protocol对象实现协议内容,即通信的内容协议ProtocolFactory: 是工厂模式的体现,在这里面生成协议Transport: 是用来收发数据,服务器端与客户端的数据收发与处理都是基于这个模块在windows中安装twisted需要先安装pywin32,自己去下载下就行.随后pip install…

APPLE-SA-2019-3-27-1 watchOS 5.2 watchOS 5.2 is now available and addresses the following: CFStringAvailable for: Apple Watch Series 1 and laterImpact: Processing a maliciously crafted string may lead to a denialof serviceDescription: A validation is…

APPLE-SA-2019-3-25-1 iOS 12.2 iOS 12.2 is now available and addresses the following: CFStringAvailable for: iPhone 5s and later, iPad Air and later, and iPodtouch 6th generationImpact: Processing a maliciously crafted string may lead to a denialof se…

APPLE-SA-2019-3-25-5 iTunes 12.9.4 for Windows iTunes 12.9.4 for Windows is now available and addresses thefollowing: CoreCryptoAvailable for: Windows 7 and laterImpact: A malicious application may be able to elevate privilegesDescription: A buffer o…

APPLE-SA-2019-3-25-6 iCloud for Windows 7.11 iCloud for Windows 7.11 is now available and addresses the following: CoreCryptoAvailable for: Windows 7 and laterImpact: A malicious application may be able to elevate privilegesDescription: A buffer over…

APPLE-SA-2019-3-25-3 tvOS 12.2 tvOS 12.2 is now available and addresses the following: CFStringAvailable for: Apple TV 4K and Apple TV (4th generation)Impact: Processing a maliciously crafted string may lead to a denialof serviceDescription: A valida…