I would like to know if anyone knows of any tool to measure d esempenho de um algoritmo .
I'll give you an example:
I have two sorting algorithms, and I wanted to measure how much tempo , memória and etc ... each one spends
I've used Java Monitor do Eclipse but I'm not relying heavily on results.
Yes, there is a way, there is an API that I have designed to address this, using Aspect-Oriented Programming. I do not want to go into details about the paradigm here, but let's take care of it.
First Option - Green Aspect Utils This is my framework with Aspects, including Log with profiling level. If you want to use my Framework, go to this link:
Simply add the @LoggableObject annotation to your method as follows:
@LoggableObject(logMode={LoggableObject.LogModes.PROFILE})
private int seuMetodo(String a, Integer b, String y, Object o, String c){
//Conputacoes e execucao de seus algoritmos
return 1;
}
Note: In order to use my framework you will need the minimal Maven
When you run this program, you will see this information you want.
Second Option, just use a profiling tool such as JConsole, JProfile
The JConsole is in the folder C: \ Program Files (x86) \ Java \ jdk1.7.0_51 \ bin
Third Option - Write your own profiling code
What will be something in this template:
public static void seuMethod() {
// sua logica
}
public static void main(String[] args) {
// Memória total
System.out.println("Memória total: "
+ Runtime.getRuntime().totalMemory());
// Memória livre
System.out.println("Memória livre: "
+ Runtime.getRuntime().freeMemory());
// Tempo de inicio
long initialTime = System.nanoTime();
seuMethod();
System.out.println("Tempo de execução total --> "
+ (System.nanoTime() - initialTime));
System.out.println("Memória total: "
+ Runtime.getRuntime().totalMemory());
// Memória livre
System.out.println("Memória livre: "
+ Runtime.getRuntime().freeMemory());
}
Read the code comments, it should help you
Note the use of methods before and after the execution of your methods.