Re: Large usage of RAM in java

Subject: Re: Large usage of RAM in java

From: Joshua Smith <email@hidden>

Date: Fri, 30 Nov 2007 12:58:06 -0500

Delivered-to: email@hidden

Java is a virtual machine, which interprets and compiles your code at run time to make it run on whatever hardware you are using.

You can take the .class file you generated and run that exact same binary, on any of dozens of different computers and it will work on all of them.

The .a (or .exe) file you generated with the C program will run only on the specific CPU/O/S combination you targeted with your compiler.

That's most of the reason. The other part of the reason is that Java has features, like garbage collection, that C does not. A lot of those threads are there to provide those features, even if you aren't taking advantage of them.

A more reasonable comparison would be to compare Java to C# on .NET, or Perl, or Python, or Ruby, etc.

Also, the next JDK, 1.7 is supposed to be a lot smarter about loading only stuff you actually need, which will probably make a big difference in special cases like this test.

-Joshua

On Nov 30, 2007, at 12:27 PM, Majd Kokaly wrote:

Greetings,

I tried both programs on my MacBook Pro:
1) simpe while loop in C
int main() {
int i = 0;
while(1)
i++;
return 0;
}
2) Simple while loop in Java:
class While {
public static void main (String[] args) {
int i= 0;
while (true) {
i++;
}
}
}

The first one used 576.00 KB of RAM, 1 Thread and the second one USED 7.63MB, 10 Threads.
Why? Is it the JVM? Why are there 10 Threads?

Any help will be appreciated.
Thanks,

Majd Kokaly
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References:

>Large usage of RAM in java (From: Majd Kokaly <email@hidden>)