Get RAM Usage

[John Brendan]

Hello,

I am new to Coderanch but glad to be here.

I am pretty noob to Java and Eclipse. Please go easy with me.

I want to get current RAM usage of my computer and display it in Console View of Eclipse? How can I achieve this?

Cheers

[Roger Sterling]

Hi John,

Welcome to the Ranch.

jconsole is the interactive utility that comes with all Java SDKs. This is used to view current system status for memory. http://docs.oracle.com/javase/7/docs/technotes/guides/management/jconsole.html

MAT is a tool for Eclipse that allows you to analyze your memory use. https://www.eclipse.org/mat/


HTH.
Roger

[John Brendan]

Hello Roger,

Thanks for the link but I just gawk at the page. I am pretty noob to programming. I do not know what to do on that page. Could you write me the code so I can test in Eclipse please?

Cheers

[Jan Hoppmann]

John Brendan wrote:Could you write me the code so I can test in Eclipse please?

There is no code involved. Both of these links are for tools, not code. YOu need to start / install them. And the links should provide you with all the info you need to do that.

[John Brendan]

Jan Hoppmann wrote:

John Brendan wrote:Could you write me the code so I can test in Eclipse please?

There is no code involved. Both of these links are for tools, not code. YOu need to start / install them. And the links should provide you with all the info you need to do that.

Hi Jan,

Thank you very much for reply.

Sorry for confusion. Probably I did not made myself clear. I want to write a Java program and send the computer RAM usage to output, in my case to Eclipse's Console View. Something like:

public class GetRAMUsage{
	public static void main(String[] args){
	
		System.out.println("RAM USAGE IS: ??????");
	
	}
}

I added ??? as placeholder for RAM usage because I do not know how to retrieve RAM usage by Java. I hope I could express myself more clearly this time. If not please let me know.

Cheers

[Rico Felix]

To do that you could probably use the following implementation:

public class FreeMemory {
	public static void main(String[] args) {
		final long totalMemory = Runtime.getRuntime().totalMemory();
		final long freeMemory = Runtime.getRuntime().freeMemory();
		System.out.println("RAM Usage is: "
				+ (totalMemory - freeMemory)
				+ " MB");
	}
}

This code fragment uses the Runtime class to acquire the total amount of memory associated with the invocation of the JVM through calling the static method getRuntime() which returns the the runtime object associated with the current Java application. After you get the runtime object invoke the totalMemory() method on this object to get the total memory, do the same to get the free amount of memory, then subtract to get amount used.

[John Brendan]

Rico Felix wrote:To do that you could probably use the following implementation:

public class FreeMemory {
	public static void main(String[] args) {
		final long totalMemory = Runtime.getRuntime().totalMemory();
		final long freeMemory = Runtime.getRuntime().freeMemory();
		System.out.println("RAM Usage is: "
				+ (totalMemory - freeMemory)
				+ " MB");
	}
}

This code fragment uses the Runtime class to acquire the total amount of memory associated with the invocation of the JVM through calling the static method getRuntime() which returns the the runtime object associated with the current Java application. After you get the runtime object invoke the totalMemory() method on this object to get the total memory, do the same to get the free amount of memory, then subtract to get amount used.

Hi Rico,

Thank you very much for code listing. It helped a lot.

Cheers

[Roger Sterling]

Get total memory from Java Runtime object only Returns the total amount of memory in the Java virtual machine. This is not the same as RAM, or memory available in the OS.