在日食中堆积

Question

I have written a code in Eclipse which runs properly for small input values but as soon as my test cases increase in size, i get OutOfMemoryException or StackOverFlow error.

i tried to use eclipse.exe -vmargs -Xmx1g to make my heap go out to 1G but i still get the same error. and When i try 2G it says unable to start JVM.

so im wondering if there is any ways at all for me to run this code. any help would be appreciated. thanks in advance.

EDIT: this is where my heaps overflows. the input sample is too huge and causes the momory problem.

 while ((line = br.readLine()) != null) {

        String[] linevalue= (line.trim().split("\\s+"));
        int l= linevalue.length;
        dg.addNode(Long.parseLong(linevalue[0]));
        dg.addNode(Long.parseLong(linevalue[1]));
        dg.addEdge(Long.parseLong(linevalue[0]), Long.parseLong(linevalue[1]));

    }

In the other class the following code is present, here mGraph is a HashMap.

public boolean addNode(T node) {
    /* If the node already exists, don't do anything. */
    if (mGraph.containsKey(node))
        return false;

    /* Otherwise, add the node with an empty set of outgoing edges. */
    mGraph.put(node, new HashSet<T>());
    return true;
}


public void addEdge(T start, T dest) {
    /* Confirm both endpoints exist. */
    if (!mGraph.containsKey(start) || !mGraph.containsKey(dest))
        throw new NoSuchElementException("Both nodes must be in the graph.");

    /* Add the edge. */
    mGraph.get(start).add(dest);
}

Answer 1

In Eclipse, you can set the size of the VM when you execute your code.

Go to Run > Run configurations . Then in the tab Arguments , put -Xms1000m under VM arguments.

Answer 2

To follow up on tskuzzy's answer :

For heap,

-Xms -Xmx

For stack

-Xss

I would recommend 1g for Xmx and Xmx , and 8m for -Xss