内容简介：What are memory leaks?No matter what programming language you code in the lifecycle of memory management is pretty much the same.While this may seem pretty straightforward memory doesn’t always get released. In a simple app this is not a huge issue but in
What are memory leaks?
No matter what programming language you code in the lifecycle of memory management is pretty much the same.
While this may seem pretty straightforward memory doesn’t always get released. In a simple app this is not a huge issue but in larger applications this can pile up and lead to the codebase experiencing a serious memory leak and the application may end up not working properly. While at the beginning you might just see slow performance, in the long term if unaddressed the leak can lead to bigger issues and crashes. In short, a memory leak is data that may not be garbage collected and is not put to use.
Chrome developer tools have a handy option for taking heap snapshots but the information is hard to decipher.
While we loved the v8 engine data we felt that there was a visual aspect that was missing. You could only view it from the Chrome dev tools memory tab. We used node-heapdump to get the information out of the browser and into our app. We also used WebSockets to send and receive data in real-time through a duplex stream between aether’s server and the client it’s installed on. WebSockets allow for a higher amount of efficiency compared to REST because they do not require the HTTP request/response overhead for each message sent and received.
The heap snapshot data that was coming back was initially overwhelming to look at and hard to make sense of. So in order to help us write better code and debug our codebases we parsed through the snapshots and developed a tool that would help us see at a glance the size of nodes and overall memory usage.
This chart shows the self size of the nodes in an application.
Self size — The size of the memory contained by the node itself. Very large objects will have large self sizes, like long strings, dictionaries, and functions with large bodies.
Retained size — The object’s self size plus the sizes of all of the objects that would be freed should the object be deleted.
This chart shows an example of spikes in memory usage in your application.
If you’re interested in trying it for yourself here is a link to the tool! https://github.com/oslabs-beta/aether/
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单元测试之道Java版
David Thomas、Andrew Hunt / 陈伟柱、陶文 / 电子工业 / 2005-1 / 25.00元
程序员修炼三部曲丛书包含了四本书，介绍了每个注重实效的程序员和成功团队所必备的一些工具。 注重实效的程序员都会利用反馈来指导开发，并驱动个人的开发流程。编码的时候，最有用的反馈来自于“单元测试”。 为了测试一座桥梁，不会只在晴朗的天气，开一辆汽车从桥中间穿过，就认为已经完成了对桥梁的测试。然而许多程序员却正在使用这种测试方法——把这种一次顺利通过称为“测试”。事实上，注重实效的程序员应......一起来看看 《单元测试之道Java版》 这本书的介绍吧!
