这篇文章介绍了cache的相关知识,包括全相关.组相关.缓存与置换策略.WriteThrough和WriteBack策略.cache体系.CPUID和缓存一致性.介绍了两种缓存一致性的协议:snoopy 和  directory based.重点讲述了Snoopy protocols的具体实现MESI协议和MERSI协议(X86体系)和扩展的MERSI协议(Cell体系).并在结尾给出了几点建议. 这篇文章介绍了内存地址转换的相关知识,同时讲述了在X86体系和Cell体系下的内存地址转换.这篇文

Multi-processor systems are often implemented using a common system bus as the communication mechanism between CPU, memory, and I/O adapters. It is also common to include features on each CPU module, such as cache memory, that enhance the performance

http://www.amazon.com/Consistency-Coherence-Synthesis-Lectures-Architecture/dp/1608455645/ref=pd_sim_14_1?ie=UTF8&dpID=416Va%2B7GPIL&dpSrc=sims&preST=_AC_UL160_SR129%2C160_&refRID=0NSDDKF5MWV2FXY1QTVQ A Primer on Memory Consistency and Cac

原文作者:Gustavo Duarte 原文地址:http://duartes.org/gustavo/blog/post/what-your-computer-does-while-you-wait Page Cache, the Affair Between Memory and Files 工作于内存和文件之间的页缓存 Previously we looked at how the kernel manages virtual memory for a user process, but

Previously we looked at how the kernel manages virtual memory for a user process, but files and I/O were left out. This post covers the important and often misunderstood relationship between files and memory and its consequences for performance. Two

In a particular embodiment, a circuit device includes a translation look-aside buffer (TLB) configured to receive a virtual address and to translate the virtual address to a physical address of a cache having at least two partitions. The circuit devi

An embodiment provides a virtual address cache memory including: a TLB virtual page memory configured to, when a rewrite to a TLB occurs, rewrite entry data; a data memory configured to hold cache data using a virtual page tag or a page offset as a c

A method includes storing, with a first programmable processor, shared variable data to cache lines of a first cache of the first processor. The method further includes executing, with the first programmable processor, a store-with-release operation,

where is the storage location of the browser's HTTP cache? disk or memory HTTP cache & storage location https://developer.mozilla.org/en-US/docs/Web/HTTP/Caching https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Cache-Control maybe disk cache

分类: LINUX 内核 2009-09-23 16:21 4561人阅读 评论(0) 收藏 举报 cachebufferos存储算法 Cache 的write back和write through 收藏 为了保证cache和memory的数据一致性,通常有三种方法: 1〉write through:CPU向cache写入数据时,同时向memory也写一份,使cache和memory的数据保持一致.优点是简单,缺点是每次都要访问memory,速度比较慢. 2〉post write:CPU更新ca

翻译自Google Guava Cache This Post is a continuation of my series on Google Guava, this time covering Guava Cache. Guava Cache offers more flexibility and power than either a HashMap or ConcurrentHashMap, but is not as heavy as using EHCache or Memcache

cache写策略 Write Through (完全写入) CPU向cache写入数据时,同时向memory也写一份,使cache和memory的数据保持一致.优点是简单,缺点是每次都要访问memory,速度比较慢. Write Back (回写) CPU更新cache时,只是把更新的cache区标记一下,并不同步更新memory.只是在cache区要被新进入的数据取代时,才更新 memory.这样做的原因是考虑到很多时候cache存入的是中间结果,没有必要同步更新memory.优点是CPU执行

之前写了一篇关于c/c++优化的一点建议,被各种拍砖和吐槽,有赞成的有反对的,还有中立的,网友对那篇博客的的评论和吐槽,我一个都没有删掉,包括一些具有攻击性的言论.笔者有幸阅读过IBM某个项目的框架代码,和我以前看过的一些代码(包括国内某顶级电信商的代码),感觉人家在细节上做的比较细,对代码的效率和安全性花了不少心思.当然国内公司也有好的代码,但是我觉得中国和美国不仅在硬件方面落后,软件方面也要落后(额,可能有人不同意我的观点..).这篇关于C/C++ cache优化的一点建议,个人理解能力的确

cache是系统中的一块快速SRAM,价格高,但是访问速度快,可以减少CPU到main memory的latency. cache中的术语有: 1) Cache hits,表示可以在cache中,查找到相应地址的entry. 2) Cache Miss,表示在cache中,找不到相应地址的entry. 3) Snoop,cache不断监视transaction的地址线,来不间断的检查地址地址是否在cache中. 4) Snarf,从main memory中读出数据,同时更新cache中的旧值,称

根据程序的局部性原理,在主存与CPU之间设置的一个高速的容量较小的存储器,叫做cache. ARM cache架构由cache存储器和写缓冲器(write-buffer)组成.其中Write_buffer是cache按照FIFO原则向主存写的缓冲器. cache可以分为Dcache,Icache.分别cache data和 instruction.其中Dcache必须在MMU开启后才能在CP15寄存器中使能,Icache在MMU未使能的情 况下,也是可以使能的. 在armv6版本之前的memor

Linux上free命令的输出. 下面是free的运行结果,一共有4行.为了方便说明,我加上了列号.这样可以把free的输出看成一个二维数组FO(Free Output).例如: FO[2][1] = 24677460 FO[3][2] = 10321516                    1          2          3          4          5          6 1              total       used       free  

[前沿]研究生阶段从事于DSP和FPGA技术的相关研究工作,学习并整理了大量的技术资料,包括TI公司的官方文档和网络上的详细笔记,花费了大量的时间和精力总结了前人的工作成果.无奈工作却从事于嵌入式技术开发工作,与通信领域关系不大,它们来源于网络,自己亦觉得应该将它们共享于网络,以便于知识的传承和再生,做出自己应有的贡献. Cache是一种特殊的存储器,它由Cache 存储部件和Cache控制部件组成.Cache 存储部件一般采用与CPU同类型的半导体存储器件,存取速度比内存快几倍甚至十几倍.而C

Methods, apparatus, and systems, including computer programs encoded on a computer storage medium, manage an address space. In some implementations, a method includes managing an allocation data structure for a memory, wherein the allocation data str

http://docs.openstack.org/juno/config-reference/content/section_keystone.conf.html http://docs.openstack.org/liberty/config-reference/content/section_keystone-cache.html keystone很多子系统如token, identity等都用到了cache,cache的设置可以是全局的对所有subsystem,也可以对每个subsyst

https://developer.apple.com/library/content/documentation/Performance/Conceptual/ManagingMemory/Articles/AboutMemory.html#//apple_ref/doc/uid/20001880-99714-TPXREF106 Wired memory (also called resident memory) stores kernel code and data structures t