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  Convert ext3 to ext4 file system on CentOS

ext3 is a journaled file system that is commonly used by the Linux kernel. It is the default file system for many popular Linux distributions, including Debian. Stephen Tweedie. On June 28, 2006, Theodore Ts'o, the principal developer of ext3, announced an enhanced version, called ext4. Today, we will show how to convert ext3 to ext4 format on CentOS. System environment: Release version : CentOS release 5.4(Final) Kernel:  Linux localhost.lo...

   CentOS, ext3 to ext4     2012-11-21 11:40:45

  First steps with Scala, say goodbye to bash scripts…

Those who know me are aware that I’ve been following play framework, and actively taking part of it’s community, for a couple of years. Playframework 2.0 is right around the corner, and it’s core is programmed in Scala, so it’s a wonderful opportunity to give this object-oriented / functional hybrid beast a try… Like many others, I will pick a very simple script to give my first steps… Finding an excuse to give Scala a try With a couple of friends we are ...

   Scala,Functional programming,Bash script,Replacement     2012-01-12 06:45:16

  Standardizing Python WSGI deployment

Over the past year I have been testing all of the new python platform as a service companies that have popped up, and I have posted my notes on my blog so that everyone can learn from my experiences. ep.io, apphosted.com, gondor.io, dotcloud.com, DjangoZoom.com, Heroku, Django hosting roundup, All and all, the platforms were very similar, they allowed you to easily host your python/django project without having to worry about managing a server or other typical system administr...

   Python,Standard,WAR,Java     2011-12-31 15:39:44

  Flash, HTML5 comparison finds neither has performance advantage

A comparison of streaming video via the Adobe Flash and HTML5 formats with numerous different browsers on both Mac and Windows produced wildly different results based on the operating system and browser, making neither a clear winner. The test, from Streaming Learning Center, was conducted in response to recent comments alleged to have been said by Apple co-founder Steve Jobs, in which he reportedly called Flash a "CPU hog." While the test found that HTML5 is significantly more efficient th...

   html5,flash,performance,comparison     2011-07-01 10:08:00

  Good ways to "insult" a computer scientist

Computer scientists are a group of people who are hard working and talented. They build the theory foundation for information and computation and they usually work on something difficult to understand. Many computer algorithms are created by computer scientists. In our mind, they are those people we admire most. But sometimes we also want to make fun of them or "insult" them. What are good ways to "insult" them? Here we share some. Ask him to make a website for you...and with PHP. Ask them why ...

   Computer scientist,Jokes     2013-08-06 09:32:56

  How to password protect a Winzip file

Winzip files are great ways of sharing documents and images of large sizes over the web or through email, since their reduced size makes it possible for them to be sent and received. Also, it is easier to manage one attachment than multiple. But what if the file contains sensitive information you don’t want snoopers to see? Simply add a password protection in Winzip. Adding a password will ensure more security and reliability of the transported files. How to add a Password to your Zip Fil...

   DATA SECURITY,WINZIP     2019-08-29 11:42:41

  CSS Overflow Property Utilization

Sometimes when we do CSS on HTML elements. We may want to hide some text when the text in a specified box overflows. Usually, we can use a CSS property overflow:hidden to hide the text so that the format of the whole element will not be affected. But will it always work? I believe some of us may encounter problems when we want to hide some text in a table td cell with specified width. If we use td { overflow:hidden;}, it is supposed to hide the text if the text in a td cell overflows. But the fa...

   CSS,Overflow,TD,Cell,Hidden     2014-10-21 08:24:48

  Understanding PGO in GoLang 1.20

Background The Go 1.20 version was officially released in February 2023, it introduced the PGO(Profile Guided Optimization) mechanism. The basic principle of PGO can be divided into the following two steps: First, profiling is performed on the program to collect data about the program's runtime and generate a profiling file. When compiling the program, enable the PGO option, and the compiler will optimize the program's performance based on the content in the .pgo file. When compiling a program...

   GO 1.20,PGO,GOLANG     2023-02-28 04:27:46

  A String is not an Error

I decided to write a little article to discourage an unfortunately common pattern in Node.JS modules (and browser JavaScript, to a lesser extent) that can boil down to these two examples: // A:function myFunction () {  if (somethingWrong) {    throw 'This is my error'  }  return allGood;} and // B: async Node.JS-style callback with signature `fn(err, …)`function myFunction (callback) {  doSomethingAsync(function () {    // …    if (...

   JavaScript,Node.js,String,Error object     2011-12-23 08:00:32

  Different types of keystore in Java -- PKCS12

PKCS12 is an active file format for storing cryptography objects as a single file. It can be used to store secret key, private key and certificate.It is a standardized format published by RSA Laboratories which means it can be used not only in Java but also in other libraries in C, C++ or C# etc. This file format is frequently used to import and export entries from or to other keystore types. Next we will explain the operations which can be performed on PKCS12 keystore. Create PKCS12 keystore Be...

   Java, PKCS12, keystore, tutorial     2015-01-04 21:08:49

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