SEARCH KEYWORD -- long process
Recover deleted file in Linux EXT3 file system
Environment : CentOS 5.3 x86_64, /dev/sdb1 is the data segment /data0. EXT3 file system. Problem : /data0/tcsql/cankao/phpcws-1.5.0/httpcws.cpp is deleted mistakenly and httpcws.cpp is not backed up. It will take much time to rewrite this program again. So we must recover it back. debugfs is feasible in EXT2 file system, but in EXT3 file system, it's not very useful. There is one open source software called ext3grep which can help us recover deleted file in EXT3 file system. The recovery steps a...
Linux,EXT3,File recovery 2013-08-16 07:06:45
10 rules of PHP-masters
1. Use PHP only when it is necessary – Rasmus Lerdorf There is no better source than the creator of PHP, to learn what he can do. Rasmus Lerdorf created PHP in 1995. Since then, the language has spread like a wildfire rate in the developer community, incidentally changing the face of the Internet. However, Rasmus did not create PHP with these intentions. PHP was created for the needs of web development. As is the case with many other projects wi...
PHP,Master,Experience,Advice 2011-12-16 09:38:07
How the Internet is Changing Economics
I'm not an economist by training, but I've spent a long time observing markets, and I've often wondered what the great economic thinkers of centuries past (Marx, Smith, Keynes, others) would say if they were alive today and could witness the transformations that have been caused by mass media (radio, TV, print) and the Internet. The Internet, in particular, has had a transformative effect that will doubtless be studied for hundreds of years to come. One of the things that can be said abou...
Python – parallelizing CPU-bound tasks with multiprocessing
In a previous post on Python threads, I briefly mentioned that threads are unsuitable for CPU-bound tasks, and multiprocessing should be used instead. Here I want to demonstrate this with benchmark numbers, also showing that creating multiple processes in Python is just as simple as creating multiple threads. First, let’s pick a simple computation to use for the benchmarking. I don’t want it to be completely artificial, so I’ll use a dumbed-down version of factorization...
Python,Multitasking,Multiprocessing,CPU bound 2012-01-17 11:38:22
Why using + to concatenate string in Java loop is not a good option
String concatenation is a common operation in Java programming. It is to concatenate multiple strings into a single string. Java provides a String class which is an immutable class which means the object cannot be mutated once instantiated. Once a String object is instantiated, its properties cannot be changed anymore, so when concatenating strings, it's actually create a new String instance to store the concatenated string values. For example, below is a simple string concatenation example. Str...
What to put on whiteboard during an interview
As a programmer, you may go through different kinds of programming tests while interviewing for jobs. The most famous and difficult one may be the whiteboard test for lots of people. Usually the interviewer will give the candidate an algorithm problem or case study and ask the candidate to implement the algorithm with his/her favorite programming language. The code to be written is not too much but it requires the candidate to thoroughly consider different edge cases. So wha...
TIPS,INTERVIEW,WHITEBOARD TEST 2014-08-29 20:34:52
How to maintain a software project?
For a software engineer, at least from my own experience, maintaining an existing software project would take up a considerable amount of time: adding new features, fixing tricky bugs, and so on. In this post, I will share some some tips about how to become a veteran from a novice quickly when facing a new project. (1) Get familiar with the background knowledge of the project. Every software has its own purposes and users: a device driver serves the specified hardware, whilst a SMS gateway helps...
/dev/null and /dev/tty in Linux
In Linux, there are two special files /dev/null and /dev/tty. /dev/null will drop all the data written to it, i.e, when program writes data to this file, it means the program has completed the data write operation. But in fact it does nothing, if you just want the status of a command but not the output of a command, this feature will be very useful. See below shell codes: /> vi test_dev_null.sh #!/bin/bash if grep...
Introducing an LMS? Here's How You Can Get Your Employees Excited About It
One of the best ways to keep employees engaged and motivated to perform well is to invest in their growth. Learning & development opportunities help employees grow their knowledge and become more efficient in their jobs. Implementing a Learning Management System(LMS) is the best way to provide L&D opportunities to your employees. Finding the best LMS for your employee learning needs starts with listing down your priorities. What do you want to achieve with the help of the LMS? What...
Designing Great API Docs
Writing documentation is one of those things that is dreaded by many developers. It takes a lot of effort and time to get right. And too often, people take shortcuts. This is sad, because well designed documentation is the key to getting people excited about your project, whether it's open source or a developer focused product. In fact, I argue that the most important piece of UX for a developer product isn't the homepage or the sign up process or the SDK download. It's the API documentati...
API docs,Design API docs,Advice 2012-03-09 23:15:00
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