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  Understand diff in Unix

diff is an important tool program in Unix. It is used to compare differences of two files, it is the foundation for code version control. If you type : $ diff <file_before_change> <file_after_change> diff will tell you what's the difference between these two files. The result may not be so easy to understand, so now I will show you how to understand diff. 1. 3 formats of diff diff has 3 formats due to historic reasons. normal diff context diff unified diff 2. Demo files For easy d...

   diff,Unix,version control,git     2012-09-03 10:49:36

  Use DTrace to diagnose gdb issues

A few days ago, I installed the newest 64-bit gdb program (version 7.7.1) on Solaris 10 (X86_64 platform) to debug programs. After playing with the gdb a day, I found 2 issues about gdb:(1) The "set follow-fork-mode child" command doesn't take effect. By default, after the parent process forks the child process, the gdb will track the parent process, so this command can make gdb begin to follow the child process. But this command works OK on Linux.(2) The gdb can't parse the 32-bit application c...

   DTrace, debug, gdb, UNIX     2014-06-28 05:11:20

  WeChat owns 70 million users now out of China

According to 36 Kr, on this year's Tencent Partner Conference, Tencent president Zhiping Liu announced that WeChat had more than 70 million users out of China, it entered Malaysia, Thailand, India, Indonesia, the Middle East, Mexico and other countries. And it has become the No.1 IM app in Mexico .While in early April, WeChat had only 40 million users abroad. In just three months, 30 million news users started to use WeChat.Tencent spares no effort to promote WeChat to the international market. ...

   WeChat,Internationalization,China,Tencent     2013-07-03 03:09:34

  Amazon unveils 8.9" Kindle Fire HD

Amazon today unveiled 7 products of Kindle family, including the $69 new Kindle; Kindle Paperwhite WiFi/3G, priced at $119 / $179; 7-inch Kindle Fire regular edition/HD version, $159/$ 199; 8.9inch Kindle Fire HD with WiFi/4G Edition at $299 /$499. However, the Amazon phone did not show up. The 8.9-inch Kindle Fire HD is today's highlight, because it looks real similar to iPad. Kindle Fire HD has the following features: 1920 x 1200 resolution, 254PPI Texas Instruments OMAP 4470 proce...

   Amazon,Kindle Fire HD,tablet     2012-09-06 19:12:05

  Google Chrome Alternatives: Best Browsers For Android

Most Android phones come with Chrome pre-installed as the default browser. There’s nothing wrong with that. Chrome is a great browser with excellent features. And it feels natural alongside all the other Google products that also come pre-installed on Android. But the type of browser someone uses is super important. In the end, the browser may be one of the most-used apps on any phone.  Browsers need to fit the needs and lifestyle of the person who is using it. To name a few examples,...

   FIREFOX,MICROSFT EDGE,CHROME     2020-06-18 07:12:35

  What can we do about Facebook?

Around 4 years ago, we have posted an article Is Facebook becoming Tencent like? to analyze the strategy Facebook adopted to build its technology empire at that time. Today, we would continue this discussion since the story seems not end there. Facebook is still on the way of copying others. The latest victim being copied is Snapchat where lots of its new features have been copied by Instagram -- an app owned by Facebook. This has helped Instagram acquired lots of active users, especi...

   FACEBOOK,OPINION,SNAPCHAT,NEWS     2017-08-11 10:39:37

  Upcoming Product from Nokia: Nokia 2

With the emergence of telephone, the field of communication has seen a revolution. It was the time when people were able to talk to each other on the phone directly, and the reliance on letters was just reduced. Later entered the cell phones where the users were able to communicate with a phone call or even with SMS. The cell phones made it easy for the users to talk to each other even if they are moving from one place to another. To add value to the cell phones then entered the smartphones to t...

   SMARTPHONE,NOKIA 2     2017-11-06 23:29:02

  Some tricks on PHP session

1. Session timeout problem There is a nuance we found with session timing out although the user is still active in the session.  The problem has to do with never modifying the session variable. The GC will clear the session data files based on their last modification time.  Thus if you never modify the session, you simply read from it, then the GC will eventually clean up. To prevent this you need to ensure that your session is modified within the GC delete time.  You can accomp...

   PHP,Session,Timeout,Solution,Various domain     2015-03-13 07:05:37

  Marissa Mayer brings 3rd Googler to Yahoo

In Marissa Mayer's plan reviving Yahoo, the focus on products is well known. It is generally expected that the reviving plan will start from Flickr. Mayer recently appeared in the Flickr team, and talked to Flickr designers. It means that Mayer now starts the formal implementation of her product strategy.After communicating with the entire team, Mayer talked to Flickr designer separately, but details are unknown. As shown below:: Mayer once again brings Yahoo the third Googler: Andrew Schulte. ...

   Googler,Yahoo,Marissa Mayer, Flickr,Andrew Schulte     2012-08-21 06:04:21

  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

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