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I want to currently profile my application which uses JCS for caching.I have used the default profiler which comes with netbeans IDE and it proves satisfactory for memory.But I want to profile my application for disk usage,because my app caches items in disk I want to verify its performance.Is there a way to do this using the profiler that comes with netbeans or using any commercial profiler such as JProfiler. Thanks in advance

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  • What are you trying to profile? If you want to know the size do a du or similar for windows. If you want to know the percentage of time spent accessing the disk, look for calls to read() and write() to the disk. Commented Dec 6, 2011 at 8:10
  • I am trying to profile how many objects are written to the disk and what amount of disk I/O is consumed during the process. Commented Dec 6, 2011 at 8:26
  • The disk consumed it just the amount of disk used. From this you should be able to estimate the number of objects written. Commented Dec 6, 2011 at 8:38

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JProfiler has a file probe that will show you:

  • a time line of files and the I/O activities on them
  • a list of all files with their I/O statistics
  • "hot spots", i.e. files on which most read/write operations are performed together with cumulated back traces to your code
  • telemetries for total read and write throughput
  • an "events" view showing single I/O operations

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Disclaimer: My company develops JProfiler

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Thanks for your input,but currently I am in my test environment,I have to show proven profiling results in order to move to the live environment where ill get lof of data.But using this tool in the test environment I am not able to see any data in the Read/Write througput,and also currently my cache sizes are of 10 mb or less.Does JProfiler show disk i/o in general or by using the java.io package,because I dont think JCS will be using java.io to write files to disk.
The file probe supports both java.io and java.nio. You could first look at the call tree view to check what JCS is actually doing.
The call tree shows the calling methods and called methods,but internally the JCS uses a queue to write to a disk,and it does it in an asynchronous manner.That is where the real problems lies for me,I need to visualize the manner in which files are being written from that queue.As far disk usage pattern is concerned JProfiler does a good job.But my case is a little different here
OK, but if you don't see anything in the file probe, it means that JCS is not writing anything to disk in the same JVM.
Ok thanks for your input.I'll keep this question open for sometime and see whether any other answers come up.
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You can do this using one of the built-in probes in JProfiler.

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And YourKit, and possibly other.
I have installed JProfiler and I went through the user guide.But is there a way by which it shows disk usage method by method.
I am also open to options to use other tools whether commercial or open source.I just need the disk i/o analysis at the object level of byte level.

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