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  Multitasking vs multiprogramming

As all these processing are the part of computer functions. You should not be confused between these processes.In computing, multitasking is a method by which multiple tasks are performed by the user also known as processes, share common processing resources such as a CPU. CPU is actively executing more than one task at a time. Multitasking solves the problem by scheduling the tasks instructions. Which task may be the one running at any...

   multitasking,multiprogramming,os,differe     2011-09-22 13:46:30

  Less Is More

I originally assumed that open source was simply a means of producing technology. But technology is just a lovely byproduct, the real goal is social. Not all open source projects work this way, but perhaps they should. I stumbled upon this realization while maintaining fog as it grew and grew and grew. Leaving issues open seemed unbearable, but over time the volume far exceeded my ability to keep up. Over time I saw the promise of a better way, but my expectations of open source would need to a...

   Open source,Less is more,Mentoring,Bug report     2011-11-28 10:45:47

  Canonicalize XML in Java

XML canonicalization is often used when there is need to create digital signature to be sent to peers for verification. Since digital signature is created based on XML data, the XML data has to be canonicalized before its signature value can be calculated. Even an extra space may affect the signature value calculated, hence it must follow some rules to canonicalize the XML data so that it has a standard format. This is why W3C created specification Canonical XML Version 1.1. This specificat...

   JAVA,XML,JAVA SECURITY     2016-01-20 01:39:45

  About short URL and its implementation

IntroductionURL shortening is a kind of technique to convert a long URL to a short URL. There are many companies now providing this kind of service, we now take Google's URL shortener service http://goo.gl/ as an example.First we navigate to http://goo.gl/, then we enter a random URL into the text field, here we use http://www.url-to-be-shortened.com as the input, it will return us an shortened URL : http://goo.gl/ZSVMM. URL ParsingWhen we type http://goo.gl/ZSVMM in browser address bar, the DNS...

       2012-07-02 07:15:09

  Simple PHP paging class

Frequently in our web applications, we may have many records in the database to display. In order to imrpove loading speed and efficiency, we may need to display some records at a time, so we need to paginate the records. For example, if we have 1 million book records and when users want to view the book list, it's inefficient to display all the records on the same page, we may need to have some pagination to allow displaying a portion of the records such as 20 records per page. This is a simple...

   PHP,Paging,Class     2012-09-10 20:23:33

  JavaScript efficiency catch up

JavaScript is a very flexible language, we can write JavaScript code freely with various styles, different kinds of codes will have different execution efficiency. Here we summarize some tips we get from our development. Efficiency of JavaScript itself JavaScript has execution context chain, closures, prototype inheritance, eval etc. It brings us some magic features, but it also introduces the performance issue, if we don't use them properly, it will affect the codes execution efficiency. 1. Glo...

   JavaScript,efficiency,event delegation,eval     2013-04-02 04:08:46

  Hello, Kernel!

When we learn module programming, the first small program must be hello, kernel!. For a novice, how do we avoid some mistakes and how to fix the bugs we have when writing the first module program? Is there any example we can refer to? Here is one example. 1. Write the hello.c 01 #include <linux/init.h> 02 #include <linux/module.h> 03 #include <linux/kernel.h> 04 //Compulsory 05 //Module lincese declaration 06 MODULE_LICENSE("GPL"); ...

   module,kernel,Linux     2013-05-03 03:33:52

  How Speeding The "Most Important Algorithm Of Our Lifetime" Could Change This Modern World

Math breakthroughs don't often capture the headlines--but MIT researchers have just made one that could lead to all sorts of amazing technological breakthroughs that in just a few years will touch every hour of your life. Last week at the Association for Computing Machinery's Symposium on Discrete Algorithms (SODA) a new way of calculating Fast Fourier Transforms was presented by a group of MIT researchers. It's possible that under cert...

   FFT,Speed-up,Fast fourier transform     2012-03-20 07:47:04

  Reproduce "MySQL server has gone away" in PHP

If you want to debug the issue of "MySQL server has gone away", you can reproduce it with below steps: Modify configuration file: sudo vi /etc/mysql/my.cnf  Make below changes: [mysqld]   wait_timeout = 30   interactive_timeout = 30  Restart the service: sudo /etc/init.d/mysql restart  Write below PHP codes: $link = mysql_connect('127.0.0.1', 'root', 'root');   if (!$link)&nbs...

   MySQL,debug,rMySQL server has gone away     2013-04-15 11:33:14

  CSS Animation vs. JavaScript: Which One Is Better?

You know that there are two ways of creating animations on the web: with CSS and JavaScript. And, their selection completely depends on the dependencies of the project. But many web developers hold a wrong perception that CSS is the only way of creating the animations. In fact, CSS has established as the most pampered system of the web development industry and most of the developers recommend it because it is mobile-friendly and powerful system. No doubt CSS is good, but JavaScript is the best....

   CSS animation, JS animation     2015-07-24 02:45:01

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