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CDN（内容分发网络）技术原理 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...问大部分的内容，这也是一种加速所有网站CDN的应用。
4．CDN 的工作原理
在描述CDN的实现原理，让我们先看传统的未加缓存服务的访问过程，以便了解CDN缓存访问方式与未加缓存访问方式的差别：
由上图可见，用户访问未...
推荐系统算法初探 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...能为用户找到他想要购买的商品或者阅读的内容。
目的4. 加深对用户的了解，为用户提供定制化服务
可以想见，每当系统成功推荐了一个用户感兴趣的内容后，我们对该用户的兴趣爱好等维度上的形象是越来越清晰的。当我...
Nested defaultdict of defaultdict
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answered Oct 4 '13 at 19:33
Andrew ClarkAndrew Clark
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Is there a “null coalescing” operator in JavaScript?
...t = undefined || "well defined"; // is "well defined"
var whatIWant = 0 || 42; // is 42
var whatIWant = "" || "a million bucks"; // is "a million bucks"
var whatIWant = "false" || "no way"; // is "false"
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Is there a difference between “throw” and “throw ex”?
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answered Apr 8 '09 at 14:24
Marc Gravell♦Marc Gravell
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Purpose of Unions in C and C++
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421
The purpose of unions is rather obvious, but for some reason people miss it quite often.
Th...
Count number of occurences for each unique value
...ommon entries are.
– Torvon
Dec 1 '14 at 16:25
5
@Torvon - sure, just use order() on the results....
How to find the Number of CPU Cores via .NET/C#?
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482
There are several different pieces of information relating to processors that you could get:
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Linux command (like cat) to read a specified quantity of characters
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194
head works too:
head -c 100 file # returns the first 100 bytes in the file
..will extract th...