Need Help on Calculating Java method performance

Question

I got into a situation that I have to provide each and every method performance in my code in time taken.

It is a multi layered application and I have to provide for each level. Like

Class A.methodA()
{
    Class B.methodB()
      {
          Class C.methodC()
           {
               //Time Taken 30 sec
            }
          //Time Taken 40 secs
        }
     //Time Taken 50 secs
}

Whole operation completed in 50 secs.

This is how I should provide a report. Is there any framework or easy way than manually tracking start time and stop time of each method? As I am new to java development, finding bit difficult to do this in easily.

look into profilers like yourKit or jProfiler

maasg
– maasg

2016-10-23 08:58:53 +00:00
Commented Oct 23, 2016 at 8:58 — maasg
– maasg, Commented Oct 23, 2016 at 8:58

S. Kaczor · Accepted Answer · 2016-10-23 09:19:16Z

1

Not sure what you mean by this code you've provided, since it doesn't look like valid java code (maybe you're confusing classes with methods?) The simplest solution is to use System.currentTimeMillis(), here is some simple example:

public class Main {
    public static void main(String[] args) throws IOException {
        long t1 = System.currentTimeMillis();
        //some code you want to check
        doOtherWork();
        long t2 = System.currentTimeMillis();
        System.out.println("Main time: " + (t2-t1));

    }

    public static void doOtherWork(){
        long t1 = System.currentTimeMillis();
        //some code you want to check
        evenMoreWork();
        long t2 = System.currentTimeMillis();
        System.out.println("doOtherWork time: " + (t2-t1));
    }

    public static void evenMoreWork(){
        long t1 = System.currentTimeMillis();
        //some code you want to check
        long t2 = System.currentTimeMillis();
        System.out.println("evenMoreWork time: " + (t2-t1));
    }
}

Remember that time spent in method main will also include time spent in all the methods that it called.

answered Oct 23, 2016 at 9:19

S. Kaczor

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2 Comments

ConfusionMaster Over a year ago

Hey thanks for help. But I did this already. But as there is lot of methods I am looking for another easy method.

ConfusionMaster Over a year ago

If there are any exceptions in lower layers, Code will not reach till t2.

lukeg · Accepted Answer · 2016-10-23 09:21:52Z

0

The tool you are looking for is called "profiler".

answered Oct 23, 2016 at 9:21

lukeg

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Comments

Ivan · Accepted Answer · 2016-10-23 10:14:32Z

0

Please note that whatever kind of profiling you'll use, it will affect the results of your app's performance. Sometimes the influence is small, sometimes it will be noticable.

The easiest thing to do is to try connecting to your application with jvisualvm (it's bundled with jdk) or any other profiler for java. Here's example of what that can show you.

answered Oct 23, 2016 at 10:14

Ivan

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