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Editorial Team
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Asked: 2026-05-15T07:56:49+00:00

I need to optimise a Java application. It makes some 3rd party calls. I

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I need to optimise a Java application. It makes some 3rd party calls. I need some good tool to accurately measure the time taken by individual API calls.
To give an idea of complexity-
the application takes a data source file containing 1 million rows, and it takes around one hour to complete the processing. As a part of processing , it makes some 3rd party calls (including some network calls). I need to identify which calls are taking more time then others, and based on that, find out a way to optimise the application.

Any suggestions would be appreciated.

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1 Answer

  1. Editorial Team

    I can recommend JVisualVM. It’s a great monitoring / profiling tool that is bundled with the Oracle/Sun JDK. Just fire it up, connect to your application and start the CPU-profiling. You should get great histograms over where the time is spent.

    Getting Started with VisualVM has a great screen-cast showing you how to work with it.

    Screen shot:

    VisualVM screenshot

    Another more rudimentary alternative is to go with the -Xprof command line option:

    -Xprof

    Profiles the running program, and sends profiling data to
    standard output. This option is provided as a utility that is
    useful in program development and is not intended to be be
    used in production systems.

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