2 performance test tools

性能测试工具 

<1> IBM RPT(Rational Performance Test)

IBM® Rational® Performance Tester is a performance testing solution that validates the scalability of web and server applications. Rational Performance Tester identifies the presence and cause of system performance bottlenecks and reduces load testing complexity.

Rational Performance Tester helps you quickly execute performance tests that analyze the impact of load on your applications.

Code-free testing enables you to create test scripts without programming.
Root cause analysis tools find and diagnose the cause of performance problems.
Real-time reporting enables immediate recognition of performance problems and renders a browser-like view of test results in web pages.
Test data can be generated from scripts, data pools with automated variation, and the insertion of custom Java® code for flexible test customization.
Load testing helps ensure applications are able to handle large user loads prior to deployment.

<2> HP LoadRunner

LoadRunner software gives an accurate picture of end-to-end system performance. This application load testing software helps you identify and resolve issues before application go-live.

With the LoadRunner 12 evaluation software, you can:

Reduce the time and skill for scripting and testing Web 2.0 and mobile web applications
Test a range of applications from a single tool
Test browser-based and native mobile applications using advanced network behavior and service virtualization
Run simple, elastic, and realistic tests from multiple locations by load testing in the cloud
Integrate performance testing into your development environment, including IDE, continuous integration, and build systems



--测试可以模拟多个用户同时登陆系统，进行压力测试，包含CPU, Memory, I/O, DB. 

如果timeout了，查看连接数是否是因为系统默认的没有改(默认的连接数都比较小)，如果同时使用系统的用户多余默认设定的，那么容易出现DB table locked.

还有可以在code review优化代码, 优化硬件利用率.