Question

Runtime.getRuntime().maxMemory()

Asked by: MarkLoveExEx

I am running Java Version 1.4.2 on Redhat linux.

In my code, I keep track of memory usage by using the following:

maxMemory = (Runtime.getRuntime().maxMemory() / 1000000);

So, if I specify on the command line -Xmx300m, maxMemory reports about 300 MB.

But, out of the blue, after restarting my program, maxMemory started reporting back a HUGE number to me: 9223372036854 MB (even if I don't specify -Xmx). And, I am getting java.lang.OutOfMemoryError(s) stating that my program is trying to use too many threads.

BUT, if I run the same program on another machine, I don't have any of these issues.

Why is getRuntime().maxMemory returning such a huge number on just this one linux box?

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Asked On
2009-10-16 at 06:52:21ID24818046
Tags

Java

Topic

Java Programming Language

Participating Experts
2
Points
500
Comments
5

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Answers

 

by: ksivananthPosted on 2009-10-16 at 06:57:20ID: 25589572

have you tried running a small test application in that box?

 

by: sciuriwarePosted on 2009-10-16 at 07:54:04ID: 25590120

For your information: I had severe errors with some JAVA versions on LINUX.
Try 1.5 or 1.6 for a start; it smells of an internal error.

;JOOP!

 

by: MarkLoveExExPosted on 2009-10-16 at 07:59:00ID: 25590177

ksivananth --

Just did a small test:

public class Main {
    public static void main(String[] args) {
        System.out.println("hello");
        Long maxMemory = (Runtime.getRuntime().maxMemory() / 1000000);
        System.out.println("maxMemory: " + maxMemory);
    }
}

Output:
hello
maxMemory: 9223372036854

On another machine, Output is as follows:
hello
maxMemory: 66

 

by: MarkLoveExExPosted on 2009-10-16 at 08:59:51ID: 31642096

I was able to switch my Java to 1.5. The problem went away. :)  Thanks!   Mark

 

by: sciuriwarePosted on 2009-10-16 at 09:10:09ID: 25590792

Lucky you; bad image for LINUX.

;JOOP!

20120131-EE-VQP-002

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