Earlier this year, we released our annual. It was based off a performance survey which collected responses from over 1500 developers, testers, architects, and many more interestingly named job titles. The great news is we gave $0.50 for every completed survey to a great charity called (formerly Dogs for the Disabled), which provide assistance dogs to disabled children. As with all problems which have many solutions, it can often be tricky to determine which is the best solution for you.

What works for other people may not work for you. When it comes to profilers, there are many on the market, and it’s often tough to determine what the differences are and which is best for your application. This blog post looks at some of the report insights and answers the following questions: • Which tools find the highest number of bugs? • Should I be using more than one tool? Let’s look at the results!

Almost half (46.6%) of survey respondents use multiple profilers The wily among you will have noticed that the first image in this blog contains percentages which do not add up to 100%. The reason for this isn’t basic math incompetence.

No, not this time. This time it’s because the question allowed for multiple choice answers, in case people tended to use more than one profiling tool on their applications. It turns out that it was very common for teams to use multiple tools as each tool tends to be better in certain phases or the application lifecycle, or perhaps preferable when chasing down a particular type of performance bug.

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Wanna find bugs? Roll your own! Most performance bugs were found by custom in-house tools. This might be because those who write the custom tools work with very particular applications and have the specific application knowledge to expose certain bugs that other tools may not. We might also be able to infer that if a team were able to write their own in-house performance tools, they are likely to be closer to the nirvana that is a performance expert. As such they would be able to find more performance bugs than others anyway. Tools which did very well include JProfiler, XRebel (which is more than a profiler actually), NetBeans profiler, JMC, and JProbe.

May 15, 2008 - JProfiler. Rule theory, the key step to decomposing a system into modules is to determine the. Pages: 703-712.

From our personal point of view, it was really exciting to see XRebel, a relatively new profiler on the block finding some of the most bugs out of any tool. This may well be because it is designed to be used in development, a place where it’s easier to find and eliminate bugs. Can you really blame your tools?

Well, from the graph below, you might be able to blame not having enough tools, as there’s a definite trend showing that you can find more performance issues if you use multiple tools. This helps to show there is a right tool for the right job. The job, however, may vary, for instance, you might be trying to find and fix specific types of IO issues or code bottleneck. You might have a preferred tool for each of those tasks.

You might want to use JMC in production, but XRebel in development as each tool is better suited to different environments. The Top 5 Java Profilers! As you have seen from the first image in the blog, the top five Java profilers, by usage, in our industry, from our survey results are VisualVM, JProfiler, Custom tooling, Java Mission Control and YourKit. Let’s take a look at them in a little more depth.

Oh, we’ll also give an honorable mention to XRebel, the performance tool for Java developers, taking over 3% of the votes, which wasn’t even a year old at the time the survey was released! We’ll look through them in reverse order of usage for increased tension and suspense, even though you already know which is top! Your Kit (Used by 15.0% of respondents) The YourKit profiler is one of the most established leaders among Java profilers. As a mature and a versatile profiler, YourKit can do both CPU and memory profiling for you, with integrations across major Java application servers, JDBC and other frameworks for high-level performance analysis like finding synchronization issues and excessive database accesses. YourKit can run in both sampling and tracing profiling modes, and the mixed approach helps it make the most from both worlds: the precision of tracing the actual code execution while being able to precisely control the profiling overhead. The memory profiling in YourKit can detect memory leaks and trace the excessive objects back to the GC roots to show you why the objects are not being collected.

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A memory snapshot comparison and automatic memory snapshot generation when memory is low can help further analyze your application’s heap. With the unique on-demand profiling, you can run the profiled application with approximately zero overhead, activating actual profiling only when it is needed. When the profiler’s capabilities are needed you can always turn the YourKit profiler on, and you can precisely control the overhead that you’re able to tolerate. YourKit, used by 15% of survey respondents didn’t fare too well on how many performance bugs typically found per release, but it wasn’t too far behind with 4.2 issues on average. Java Mission Control (Used by 17.1% of respondents) Java Mission Control is a Java performance monitoring tool by Oracle which has been shipped with the JDK since Java version 7 update 40.