Measure method execution time using java agent and byte-buddy

[shehanper...@gmail.com]

Hi,
I want to measure execution time of a program without changing the my program. I think java agent and byte buddy can be use for this problem. But i don't have a idea about how to do it.

can you please help

[Rafael Winterhalter]

Hei,

yes, that is perfectly possible. You can have a look at this SO answer to begin with: https://stackoverflow.com/questions/38849768/profiling-using-byte-buddy-or-some-library

Best regards, Rafael

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[she...@wso2.com]

On Friday, December 15, 2017 at 1:05:42 AM UTC+5:30, Rafael Winterhalter wrote:
> Hei,
> yes, that is perfectly possible. You can have a look at this SO answer to begin with: https://stackoverflow.com/questions/38849768/profiling-using-byte-buddy-or-some-library
>
> Best regards, Rafael
>
>
>
> 2017-12-14 7:37 GMT+01:00 <shehanper...@gmail.com>:
> Hi,
>
> I want to measure execution time of a program without changing the my program. I think java agent and byte buddy can be use for this problem. But i don't have a idea about how to do it.
>
>
>
> can you please help
>
>
>
> --
>
> You received this message because you are subscribed to the Google Groups "Byte Buddy" group.
>

> To unsubscribe from this group and stop receiving emails from it, send an email to byte-buddy+...@googlegroups.com.

>
> For more options, visit https://groups.google.com/d/optout.

I followed this and some other your answers in SO . I used following code for java agent .

public static void premain(String arguments, Instrumentation instrumentation) {
System.out.println("Premain");
new AgentBuilder.Default()
.type(ElementMatchers.nameEndsWith("Timed"))
.transform((builder, type, classLoader, module) ->
builder.method(ElementMatchers.any())
.intercept(MethodDelegation.to(MonitorInterceptor.class))
).installOn(instrumentation);

}

This is my MonitorInspector

public class MonitorInterceptor {

@RuntimeType
public static Object intercept(@Origin Method method,
@SuperCall Callable<?> callable) throws Exception {
long start = System.currentTimeMillis();
try {
return callable.call();
} finally {
System.out.println(method + " took " + (System.currentTimeMillis() - start));
}
}
}

But this not gives the printout of time it only provide following output .

Premain
Main Class

Can you give me an idea what is the problem ,that no giving the output from MonitorInspector ?

[shehanper...@gmail.com]

Found solution from https://github.com/raphw/byte-buddy/issues/257
Thanks!!

[Rafael Winterhalter]

I added an extended answer to your SO question.

2017-12-17 6:36 GMT+01:00 <shehanper...@gmail.com>:

Found solution from https://github.com/raphw/byte-buddy/issues/257
Thanks!!

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