* 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), some plugins use dynamic byte code mechanisms 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 dynamic byte code.
