performance 如何测试java应用程序的性能瓶颈？
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How to test java application for performance bottlenecks?
提问by Niyaz
I am reviewing a big java application to see if there are any performance bottlenecks. The real problem is that I cannot pinpoint the performance issues to any single module. The whole application is slow as such.
我正在一个大型 Java 应用程序，以查看是否存在任何性能瓶颈。真正的问题是我无法确定任何单个模块的性能问题。整个应用程序因此很慢。
Is there some tool/technique I can use to help me out in this?
是否有一些工具/技术可以帮助我解决这个问题？
采纳答案by Bartosz Bierkowski
Try using a profiler on your running code. It should help you identify the bottlenecks. Try jprofileror Netbeans profiler
尝试在您的运行代码上使用分析器。它应该可以帮助您确定瓶颈。尝试jprofiler或Netbeans 分析器
回答by wvdschel
I'm often happy enough using Java -Xprof. This gives you a sorted list of the functions your code spends most of its time in.
我经常很高兴使用Java -Xprof. 这为您提供了代码花费大部分时间的功能的排序列表。
回答by HadleyHope
If you are running on Java 6 you can use the supplied monitoring tools
如果您在 Java 6 上运行，则可以使用提供的监控工具
回答by Tnilsson
For testing/development purposes, you can download Oracle JRockit Mission Control for free from thissite. (Requires Login, but accounts can be set up with any email adress)
出于测试/开发目的，您可以从该站点免费下载 Oracle JRockit Mission Control 。（需要登录，但可以使用任何电子邮件地址设置帐户）
Docs Here. It will allow you to find hotspots, memory leaks and much more.
文档在这里。它将允许您找到热点、内存泄漏等等。
回答by Riking
As we see from How can I profile C++ code running in Linux?, the most statistically significant approach is to use a stack profiler.
正如我们从如何分析在 Linux 中运行的 C++ 代码所看到的 ？，最具有统计意义的方法是使用堆栈分析器。
Well, Java runs in the JVM, so getting a stack useful for C code won't be useful for us (it'll get the JVM stuff, not your code). Fortunately, Java has jstack! http://docs.oracle.com/javase/1.5.0/docs/tooldocs/share/jstack.html
好吧，Java 在 JVM 中运行，因此获得对 C 代码有用的堆栈对我们没有用（它将获得 JVM 内容，而不是您的代码）。幸运的是，Java 有jstack！http://docs.oracle.com/javase/1.5.0/docs/tooldocs/share/jstack.html
It'll give you a bunch of threads, like the GarbageCollector. Don't worry about those, just look at where your threads are.
它会给你一堆线程，比如 GarbageCollector。不要担心这些，只要看看你的线程在哪里。
