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javabenchmarking

Benchmarking a java jar by .sh script

I have an Java Fork/Join application which I want to benchmark 30 times. The execution of the program returns as output the time it needed to compute something. However, I read about warming up the JVM but I'm unsure on how to do this. I do this by means of the following .sh script:

for iteration in {1..30}
do
    java -jar program.jar >> data.csv
done

Now my question, will the first X runs warm-up the JVM or will it not be able to optimize the program since I create a new process for every run? If so, do I need to put the for-loop into the program itself, or is there another way around?

Solution

  • The warm-up needs to be in the program. A standard JVM won't remember any JIT optimizations it does between invocations.