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通过 ulimit 改善系统性能 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...rver 发出请求，那么此时 server 就会需要创建大量的 socket 连接。但在一个系统当中，往往需要限制单个 server 程序所能使用的最大 socket 数，以供其他的 server 程序所使用。那么我们如何来做到这一点呢？答案是我们可以通过 ulimi...
从Code Review 谈如何做技术 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...讨论的过程中，居然发现有个“因为对方用户的设置”我无法回复了（我被拉黑了，还有一些直接就是冷讽和骂人了，微博中我就直接删除了）。这些批评我的阿里工程师/架构师的观点总结一下如下：（顺便说一下，阿里内还...
What is the best way to detect a mobile device?
...f(/(android|bb\d+|meego).+mobile|avantgo|bada\/|blackberry|blazer|compal|elaine|fennec|hiptop|iemobile|ip(hone|od)|ipad|iris|kindle|Android|Silk|lge |maemo|midp|mmp|netfront|opera m(ob|in)i|palm( os)?|phone|p(ixi|re)\/|plucker|pocket|psp|series(4|6)0|symbian|treo|up\.(browser|link)|vodafone|wap|wind...
Shell脚本编程30分钟入门 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...bash在这方面很弱，比如说：
它的函数只能返回字串，无法返回数组
它不支持面向对象，你无法实现一些优雅的设计模式
它是解释型的，一边解释一边执行，连PHP那种预编译都不是，如果你的脚本包含错误(例如调用了不存...
How does Dijkstra's Algorithm and A-Star compare?
I was looking at what the guys in the Mario AI Competition have been doing and some of them have built some pretty neat Mario bots utilizing the A* (A-Star) Pathing Algorithm.
...
“INSERT IGNORE” vs “INSERT … ON DUPLICATE KEY UPDATE”
...th many rows, I want to skip duplicate entries that would otherwise cause failure. After some research, my options appear to be the use of either:
...
Need for predictable random generator
...ndomness in small runs of some games is undesirable -- it does seem too unfair for some use cases.
I wrote a simple Shuffle Bag like implementation in Ruby and did some testing. The implementation did this:
If it still seems fair or we haven't reached a threshold of minimum rolls, it returns a...
Difference between add(), replace(), and addToBackStack()
What is the main difference between calling these methods:
9 Answers
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How do I view all commits for a specific day?
...rking on a specific day and update my timesheet based on that, but it's a pain in the ass to type in the full date in ISO format so I just do it like this
git log --after=jun9 --before=jun10
and I add --author to only print my commits
git log --since=jun9 --until=jun10 --author=Robert
This pr...
Swift 编程语言入门教程 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...常量定义类似于函数式编程语言中的变量，一次赋值后就无法修改。多多使用有益健康。
一个常量或变量必须与赋值时拥有相同的类型。因此你不用严格定义类型。提供一个值就可以创建常量或变量，并让编译器推断其类型...