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动态追踪（Dynamic Tracing）技术漫谈 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...，但也只有 1% 的比例。一开始我们很自然的去怀疑网络协议栈方面的细节。但后来我通过一系列专门的 SystemTap 工具直接分析那些超时请求的内部细节，便定位到了是硬盘 配置方面的问题。从网络到硬盘，这种调试是非常有趣...
How to debug Lock wait timeout exceeded on MySQL?
...ySQL thread id 276558, OS thread handle 0x7f93762e7710, query id 59264109 [ip] [database] cleaning up
Trx read view will not see trx with id >= 2744943821, sees < 2744943821
(unsure if the "Trx read view" message is related to the frozen lock, but unlike the other active transactions, this o...
Should I use Vagrant or Docker for creating an isolated environment? [closed]
... what you want.
Vagrant is a virtual machine manager. It allows you to script the virtual machine configuration as well as the provisioning. However, it is still a virtual machine depending on VirtualBox (or others) with a huge overhead. It requires you to have a hard drive file that can be huge, i...
What are the differences between local branch, local tracking branch, remote branch and remote track
...m:Flimm/example.git
HEAD branch: master
Remote branches:
io-socket-ip new (next fetch will store in remotes/origin)
master tracked
new-branch tracked
Local ref configured for 'git pull':
master merges with remote master
new-branc...
How to avoid reverse engineering of an APK file?
... is looking for a needle in a haystack. Insert random classes containing snippets from the internet, or just functions for calculating random things like the Fibonacci sequence. Make sure these classes compile, but aren't used by the actual functionality of the app. Add enough of these false classes...
Fast Bitmap Blur For Android SDK
...ded 500ms while the blurring only took another 250 ms or so.
Use Renderscript
Renderscript provides ScriptIntrinsicBlur which is a Gaussian blur filter. It has good visual quality and is just the fastest you realistically get on Android. Google claims to be "typically 2-3x faster than a multithrea...
What's the “big idea” behind compojure routes?
... the HTTP response.
;; Let's take a look at an example:
(defn what-is-my-ip [request]
{:status 200
:headers {"Content-Type" "text/plain"}
:body (:remote-addr request)})
Pretty simple, but also quite low-level.
The above handler can be defined more concisely using the ring/util library.
...
How to install mongoDB on windows?
..., it’s not an installation it’s just Downloading…
I. Download the zip file http://www.mongodb.org/downloads
II. Extract it and copy the files into your desired location.
III. Start the DB engine.
IV. Test the installation and use it.
That's it! So simple, right? Ok let’s start
1. Downlo...
Hidden Features of MySQL
... access. For example:
--datadir will specify the data directory and
--skip-innodb will turn off the inno option and save you 10-20M
More here
http://dev.mysql.com/tech-resources/articles/mysql-c-api.html
Download Chapter 7 - Free
InnoDB is transactional but there is a performance overhead that...
What is Node.js? [closed]
...pose you have a Node.js program that does a variety of tasks, listens on a TCP port for commands, encodes some images, whatever. With five lines of code, you can add in an HTTP based web management portal that shows the current status of active tasks. This is EASY to do:
var http = require('http');...