Approximate timing for various operations on a typical PC
| execute typical instruction | 1/1,000,000,000 sec = 1 nanosec |
| fetch from L1 cache memory | 0.5 nanosec |
| branch misprediction | 5 nanosec |
| fetch from L2 cache memory | 7 nanosec |
| Mutex lock/unlock | 25 nanosec |
| fetch from main memory | 100 nanosec |
| send 2K bytes over 1Gbps network | 20,000 nanosec |
| read 1MB sequentially from memory | 250,000 nanosec |
| fetch from new disk location (seek) | 8,000,000 nanosec |
| read 1MB sequentially from disk | 20,000,000 nanosec |
| send packet US to Europe and back | 150 milliseconds = 150,000,000 nanosec |
Approximate timing for various operations on a typical PC的更多相关文章
- Teach Yourself Programming in Ten Years
Teach Yourself Programming in Ten Years——用十年教会自己编程 作者:Peter Norvig 译者:刘海粟 本文原文为:http://norvig.com/21 ...
- 学习笔记：Rick's RoTs -- Rules of Thumb for MySQL
Table of Contents SELECTs -- do's and don'tsINDEXingENGINE DifferencesOptimizations, and notPARTITIO ...
- Rick's RoTs -- Rules of Thumb for MySQL--转载
原文地址:http://mysql.rjweb.org/doc.php/ricksrots Brought to you by Rick James Here are 160+ tips, trick ...
- 驱动: i2c驱动 >>>>
1. IIC协议: <<um_s3c2440a_rev10.pdf>> p481 Figure 20-3. IIC-Bus Interface Data Format< ...
- TimeUnit枚举类
TimeUnit是 java.util.concurrent 中的一个枚举类.一般让线程进行睡眠时使用: TimeUnit.MILLISECONDS.sleep(100); 比如上面一行代码表示让当 ...
- Spring Security（二十九）：9.4.1 ExceptionTranslationFilter
ExceptionTranslationFilter is a Spring Security filter that has responsibility for detecting any Spr ...
- Improving cache consistency redis和db的一致性维护
From http://simongui.github.io/2016/12/02/improving-cache-consistency.html A typically web applicat ...
- Video for Linux Two API Specification Revision 2.6.32【转】
转自:https://www.linuxtv.org/downloads/legacy/video4linux/API/V4L2_API/spec-single/v4l2.html Video for ...
- spring boot整合redis,以及设置缓存过期时间
spring-boot 整合 redis 注:redis服务器要先开启 pom文件: <dependency> <groupId>org.springframework.boo ...
随机推荐
- CodeForces - 710C Magic Odd Square（奇数和幻方构造）
Magic Odd Square Find an n × n matrix with different numbers from 1 to n2, so the sum in each row, c ...
- Visual Studio 2017中如何创建安装打包项目
从Visual Studio 2012开始,微软就不在环境中自动集成安装打包项目了,如果还想使用,需要手动下载安装,这里以在Visual Studio 2017上安装打包项目为例进行介绍,步骤如下: ...
- Data Base sql server 备份数据库
sql server 备份数据库 1.维护计划向导: 右键维护计划-维护计划向导-然后安装提示: 勾选自己要干的事,比如:完整备份数据库.差异备份数据库等等 2.作业计划: 如下图: SQL Serv ...
- CentOS6.5上Zabbix3.0的RPM安装【三】-安装并添加Agent
七.Download and install Zabbix Agent Zabbix Agent is required to install on all remote systems needs ...
- Ubuntu小记
一. Ubuntu分区记忆 参考教程调整: 1. /boot用于安装grub,设为主分区 2. /根目录20G一般足够 3. /home剩下的给home 4. swap空间=物理内存 挂载点 大小 类 ...
- git 增量打包
git diff f506693 ccc253c3 --name-only | xargs tar -czvf update.tar.gz
- django 学习之DRF (三)
Django学习之DRF-03 视图集 1.视图集介绍 2.视图集基本使⽤ 1.需求 使⽤视图集获取列表数据和单⼀数据 2.实现 class BookInfoV ...
- Jmeter-逻辑控制器之Foreach
ForEach 作用:用来遍历当前元素的所有可执行场景:在用户自定义变量中读取一系列相关的变量,该控制器下的采样器或控制器都会被执行一次或多次,每次读取不同的变量值: 输入变量前缀:在其中输入需要遍历 ...
- 10.17(山东多校联合模拟赛 day1)
山东多校联合模拟赛 day1 题不难 rect [问题描述] 给出圆周上的 N 个点, 请你计算出以这些点中的任意四个为四个角,能构成多少个矩形. 点的坐标是这样描述的, 给定一个数组 v[1..N] ...
- CF796C Bank Hacking 思维
Although Inzane successfully found his beloved bone, Zane, his owner, has yet to return. To search f ...