理解slotted page

2024-04-05 04:15:40

Overview

理解access pointer vs. access memory

A slotted page has a fixed-size header that holds important information about the page and cells.
Slot in Computer Architecture

A slot comprises the operation issue and data path machinery surrounding a set of one or more execution unit which share these resources.

In dynaically scheduled machines, the concept is more commonly called an execute pipeline.

Modern conventional central processing units (CPU) have several compute pipelines, for example: two arithmetic logic units (ALU), one floating point unit (FPU), one Streaming SIMD Extensions (SSE), one branch.

Each of them can issue one instruction per basic instruction cycle, but can have several instructions in process.
Execution Unit

An execution unit (EU) is a part of the central processing unit (CPU) that performs the operations and calculations as instructed by the computer program.

Mordern CPU’s execution units are usually pipelined.
Instruction pipelining

Instruction pipelining is a technique for implementing instruction-level parallelism within a single processor.

Pipelining attempts to keep every part of the processor busy with some instruction by dividing incoming instructions into a series of sequential steps performed by different processor units with different parts of instructions processed in parallel.
Instruction-level parallelism

Instruction-level parallelism (ILP) is a measure of how many of the instructions in a computer program can be executed simultaneously.
Advantage of Slotted Page
1. Minimal overhead: the only overhead incurred by slotted pages is a pointer array holding offsets to the exact positions where the records are stored
2. Space reclamation: space can be reclaimed by defragmenting and rewriting the page
3. Dynamic layout: from outside the page, slots are referenced only by their IDs, so the exact location is internal to the page.
理解overhead&reclaim&layout in computer
References

File Organization Storage

理解slotted page相关推荐

Page Cache引起的业务问题处理
在工作中,你可能遇见过与 Page Cache 有关的场景,比如: 服务器的 load 飙高: 服务器的 I/O 吞吐飙高: 业务响应时延出现大的毛刺: 业务平均访问时延明显增加. 这些问题,很可能是 ...
关于ViewPager.PageTransformer的一些理解
今天早上在看hongyang的推送,说已经有了ViewPager2,是google的sample,地址为:https://github.com/googlesamples/android-viewpa ...
%@ Page% page指令属性
以前只知道会用就行,今天boss让我去理解一下<%@ Page%>里面的各个属性的用法,于是就有了这篇东凑西凑的文章! <%@ Page%>是页面指令,作用于当前页面,指定使用 ...
JSP页面头部page标签详解
理解这个page标签必须搞懂jsp文件从请求到响应经历的三个阶段. 1)将jsp文件编译成servlet java文件(pageEncoding) 2)服务器将java文件编译成class文件(不受外 ...
linux内核深度解析豆瓣,来着豆瓣经典点评《深入理解linux内核
曾几何时,我们为调试成功第一段汇编小程序而欢欣鼓舞,为写完C语言小程序通宵达旦,为自己的数据结构解决了一个实际问题而踌躇满志.再后来我们学习了计算机组成原理或者高级点的计算机系统结构,学习过操作系统的 ...
数据库系统知识点总结与英文课件翻译
数据库系统 lec1 数据库系统概述 1.什么是数据库 P3 Data 数据: facts and statistics collected together for reference or ana ...
记录一下 CMU 15445 项目
目录 Write In Front PROJECT #1 - BUFFER POOL TASK #1 - LRU REPLACEMENT POLICY 核心概念数据结构 Other TASK #2 ...
数字笔记-Notion使用教程
Notion使用教程背景最近圈子里聊的比较多,就尝试了一下使用.当然,由于桌面版是全英文(我不知道有没有汉化包,我觉得作为一个开发者,也没有必要使用汉化包),而且官方教程比较少,所以新手使用不太友 ...
安卓开发1-初步了解使用
1. src源代码:res资源,包括图片和布局值等等:asset据说是视频等等. 2.关于布局,有点类似IOS.界面和后台逻辑分开写,然后连接起来. 布局界面就是XML实现了,跟WP7的方式也是蛮像的 ...

最新文章

热门文章