Slashdot Mirror
Build Your Own Java Performance Profiling Tool
An anonymous reader writes "IBM DeveloperWorks has an interesting look at creating a custom profiler using Java 5 and AOP. From the article: 'Profiling is a technique for measuring where software programs consume resources, including CPU time and memory. This article provides a list of best-of-breed features you might look for in an ideal profiler and explains why aspect-oriented techniques are well suited to achieving some of those features. It also introduces you to the JDK 5.0 agent interface and walks you through the steps of using it to build your own aspect-oriented profiler.'"
Download jrat here
I've used it many times, and it's helped me find horrible Hibernate queries, Lucene bottlenecks, Batik rendering pipeline issues. It is fantastic.
[% slash_sig_val.text %]
That's simply not true. I work on a large Java project that deals with a lot of matrix intensive work. Our Java code has been rigorously architected, engineered, and optimized. The matrix code in particular (where the majority of our processing time is spent) is far superior in Java than it was in C or C++. Every programming language has its place, use the one that suites your needs. Profiling most any code can reveal useful information.
These two tools aren't profilers, there anaylsis tools. hpjmeter uses the output generated by hprof (the profiler that ships with the JDK) and the other tool you mentioned analyzes the garbage collection log. The problem with traditional tools like hprof is that 1: they require native components and 2: they don't let you turn the profiler on and off at runtime and 3: they profile everything -- even things that you as a developer can't change.
I like hprof -- it's helped me out more times that I can say, but it also has some short comings, which is why I developed JIP
Ever heard of HotSpot? Java JVM does runtime optimization that C/C++ can't. No it doesn't happen in a two second bench test designed for C to prevail, but use in real life applications the JVM performance improves with longer runs. If you honestly look into it and realize that your "java is slow" mantra is a bit dated or is that a SlashDot fact that is not refutable?
if vegetarians eat vegetables why are cannibals not humanitarians.
"Quick! Name a successful Java program. Nope. I can't think of one either."
.NET.
Gmail. It uses Java for almost all of its back end. In fact almost all of Google's large scale web applications use Java in some form. Python is also used extensively however, it's generally used for simple scripts and smaller applications. Tons of websites use Java extensively and people like you are just too dumb to realize it. If you do online banking it's almost guaranteed that the website is using server side Java.
In terms of client side applications there's; Azureus, LimeWire, Eclipse, Netbeans, Intellij IDEA, Yahoo Site Builder, ZipCreator, Summit Groupware, jEdit, SmartCVS, NeoOffice etc. etc. Just because you don't use them doesn't mean that they're not there. The truth is that most people only use a very select few programs and these programs are often using code bases that are over 10 years old (ie. Microsoft Office, Outlook, Internet Explorer etc.). Then there's all the enterprise applications that are written in Java.... In the enterprise world Java is dominant and the only real competitor is
Netbeans has a pretty good profiler, much better than anything for Eclipse (I haven't found any good profilers for Eclipse either, though it's a good IDE)
http://profiler.netbeans.org/