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  Install Open webOS on Linux

HP has just released its first beta version of the webOS, It is said the user experience of webOS is quite impressive, so I immediately had it installed on my PC. There are two versions of Beta release,one embedded version and one Ubuntu version. I briefly share my installation experience of webOS in Linux. In the official document, it says "By 'Linux' we mean 'Ubuntu Linux'", it doesn't support server version and 64 bit version of Ubuntu. Here I use Mint 13. 1. Clone source code from github Add...

   Linux,webOS,Ubuntu,embedded,HP     2012-09-10 19:36:30

  Why are column oriented databases so much faster than row oriented databases?

I have been playing around with Hybrid Word Aligned Bitmaps for a few weeks now, and they turn out to be a rather remarkable data structure.  I believe that they are utilized extensively in modern column oriented databases such as Vertica and MonetDB. Essentially HWABs are a data structure that allows you to represent a sparse bitmap (series of 0's and 1's) really efficiently in memory.  The key trick here is the use of run length encoding to compress the bitmap into fe...

   Database,Column oriented,Speed analysis,Vertica     2012-01-29 04:27:05

  Use cases of Java enumeration

JDK 1.5 introduces a new type -- enumeration. In Java, it's just a small feature, but it can bring us much convenience.Here we summarize some use cases of Java enumeration. 1. Constant Prior to JDK 1.5, we can define constant as public static final..., now we can use enumeration to group all constants in one enum variable and it also provides some useful functions. public enum Color {     RED, GREEN, BLANK, YELLOW   }  2.In Swit...

   Java, Enum,enumeration     2013-01-05 09:15:30

  How to do pprof for gRPC service

gRPC is a RPC framework based on HTTP and is frequently used for communications among micro service inside the same organization network. However,  the service functions cannot be accessed via normal HTTP URL as it's not a WEB framework. In this case, how to do pprof on a gRPC service? The trick is starting a HTTP server asynchronously while starting the gRPC service. This HTTP server can be accessed to run prrof debug. go func(){ http.ListenAndServe(":10001", nil) }() Since it uses the de...

   GOLANG,PPROF,GRPC     2021-01-29 23:11:33

  "Simplicity" is not a simple concept

I've come to avoid using the word "Simplicity" or its variants ("Simple," &c.) It means too many different things to different people.For example, my original land-line phone was simple:It's simple by eliminating extraneous use cases. It only handles one user scenario, the one that was the most common when it was invented. If we think of the number of affordances and the number of uses, this kind of simplicity lowers the number of affordances by lowering the number of uses. I call this kind ...

   Simplicity,Software,Usability,iPhone,Phone     2011-11-24 09:21:09

  "Programmer" is an Overgeneralization

"Beware of bugs in the above code; I have only proved it correct, not tried it." - Donald Knuth Earlier today, I came across a post during a google-fu session that claimed that no one should use the C++ standard library function make_heap, because almost nobody uses it correctly. I immediately started mentally ranting about how utterly ridiculous this claim is, because anyone whose gone to a basic algorithm class would know how to properly use make_heap. Then I started thinking about all the ...

   Programmer,Overgeneration,Overload     2012-03-13 08:13:16

  The Disruptor In The Valley

Justin Kan and Emmett Shear watched their first startup, an online calendar called Kiko, implode when Google decided to do the same thing in 2006. They sold Kiko's scraps on eBay for $258,000 and wondered what to do with their lives. So the pair did the only thing they could think of: They went to see Paul Graham at his house in Cambridge, Mass., near Harvard Square. Graham sat them down and helped bang out a plan to create Justin.tv, now the Web's biggest portal for live video, with 31 million ...

   Paul Graham,Creative,Programmer,Investme     2011-08-28 04:13:43

  What We’re Really Afraid Of

I recently had a very interesting conversation with a friend who recently launched an online business, and it surprised me how our fears are never what they seem to be It went something like this: B.: I need your help. I launched my product a few months ago, but I am not getting any sales. Me: Do you have traffic? B.: Not much, about 100 visitors a month Me: Then you need to get more traffic. You probably need at least 100x that amount in your market to start seeing any sales. B.: And how do...

   Developer,Career,Idea,Refuse,Afraid     2012-01-06 02:30:42

  Do American teenagers hate Facebook?

PewInternet released latest survey report about Internet and life. The report shows that Facebook is still the favorite social network of American teenagers, but it's also the most criticized one. Although some people enjoyed staying on Facebook, most people are complaining that there are more and more adult contents and negative social interactions on Facebook. The key findings are: Teens are sharing more information about themselves on social media sites than they did in the past. Teen Twitte...

   American teenage,Facebook,Survey     2013-05-26 10:37:40

  Valid JavaScript variable names

Did you know var π = Math.PI; is syntactically valid JavaScript? I thought this was pretty cool, so I decided to look into which Unicode glyphs are allowed in JavaScript variable names, or identifiers as the ECMAScript specification calls them. Reserved words The ECMAScript 5.1 spec says: An Identifier is an IdentifierName that is not a ReservedWord. The spec describes four groups of reserved words: keywords, future reserved words, null literals and boolean lite...

   JavaScript,Name convention,Standard     2012-02-22 05:16:53

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