* SkyWalking is an open source Large-Scale Distributed Systems Tracing Infrastructure, also been known as APM(Application Performance Management) tool. SkyWalking provides a solution to help monitor and analysis a Large-Scale Distributed Systems.
* SkyWalking supports popular rpc frameworks, such as [dubbo](https://github.com/alibaba/dubbo), [dubbox](https://github.com/dangdangdotcom/dubbox), etc., supports email-alert when application occurs unexpected exception。
* SkyWalking's basic API, execution time of blocking saving span must less than 100μs.
* By using [byte-buddy](https://github.com/raphw/byte-buddy)(Thanks to [raphw](https://github.com/raphw)), some plugins use dynamic byte code generation to avoid invasive codes. plugins API, execution time of blocking saving span must between 200μs and 300μs, including execution time dynamic byte code.
* By using [byte-buddy](https://github.com/raphw/byte-buddy)(Thanks to [raphw](https://github.com/raphw)), some plugins use dynamic byte code generation to avoid invasive codes. plugins API, execution time of blocking saving span must between 200μs and 300μs, including execution time of dynamic byte code.
