Increasing Java Stack Size for Larger Call Stacks
The Java Virtual Machine (JVM) maintains a runtime call stack for each thread. When the stack size is insufficient to handle a deep call stack, a StackOverflowError occurs. To extend this stack size for accommodating larger call stacks, leverage the java -Xss... command-line flag.
For example, in your code snippet:
public class TT { public static long fact(int n) { return n <p>To handle the fact(2^15) calculation, you can use the following:</p><pre class="brush:php;toolbar:false">java -Xss4m TT
Implementation-Specific and Thread-Specific Stack Configuration
Note that the -X... flags are implementation-dependent. In your case, you're using OpenJDK's JVM. Additionally, you can specify a larger stack size only for specific threads, avoiding the waste of memory for threads that don't require it. This is preferable over using java -Xss....
Estimating Required Stack Size
You can determine the precise stack size needed for your program by gradually increasing the -Xss value until it processes the desired calculations without encountering a StackOverflowError.
Nondeterministic Behavior
The stack requirement can sometimes be nondeterministic. Factors like garbage collection or JIT compilation could contribute to this behavior.
Alternative Implementations: Iterative vs. Recursive
Consider alternative, less stack-intensive implementations of your algorithms. For your fact function, an iterative implementation could be less prone to stack overflows:
public class TTIterative { public static long fact(int n) { if (n 65) return 0; long f = 2; for (int i = 3; i <p>Remember that the fact function cannot compute exact factorials for numbers greater than 65 due to the limitations of the long data type. Consider returning a BigInteger instead to overcome this limitation.</p>
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