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POVariable depth recursion in Java
 

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    <p>So I'm doing a little experiment on exactly how far recursion can go in the Java language since I'm taking a class on concurrency and learning about Java's threading mechanisms. Right now I'm running a Intel i5 Quad-core with 2.8 GHz and 4GB of RAM. I'm running on Windows 7 with x64 and in Eclipse with the standard JRE? Not sure about that last part I just downloaded something from Sun's website.</p> <p>Anyway,</p> <pre><code>public class StacksizeTest implements Runnable { int depth = 0; public void run() { try { doOverflow(); } catch (StackOverflowError e) { System.out.print("Overflow ocurred at depth " + depth + ".\n"); } } void doOverflow() { depth += 1; doOverflow(); } public static void main(String argv[]) { Thread mt = new Thread(new StacksizeTest()); mt.start(); mt.run(); } } </code></pre> <p>I'm also running with the default call stack size, which im pretty sure is 512Mb according to the settings file.</p> <p>So when I run the program and start a new thread I keep getting variable depths, as well as the print statement printing twice. The print statement makes sense I think because it should be running mt on a new thread. What I'm confused about is if I exclude .start() and just call .run() the "depth" is always the same (about 11,500 or so), but when I use .start() I'm getting variable depths. a couple have been 22789, 22330, and 22381. I'm having difficulty understanding why this is. Could someone possibly shed some light on this issue?</p> <p>Thanks,</p> <p>Matt</p>
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