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I keep hearing that PHP has overhead. For example a C++ int uses 4 Bytes on a 32 bit system but a PHP int uses more. What is this value? I need more space than a comment to expand on mario's findings so I'll add an answer instead. The size of a C union will be the size of its largest member (possibly with extra bytes to satisfy alignment constraints). For zvalue_value , that would be the obj which has the size of three pointers (not including the memory required for what those pointers point to): typedef struct _zend_object { zend_class_entry *ce; HashTable *properties; HashTable *guards; /*

I have a java desktop application for searching files and it is usually reaching the default heap limit pretty soon. I wont have access to all the systems it will be installed in so I want to increase the JVM heap size in the application itself. Can anybody help me how can I do that programmatically in my application Setting -Xmx to one gig doesn't mean that the JVM will allocate that much memory upon start-up. The JVM will allocate only -Xms (plus overhead) until more heap space is needed. Do you need to protect your users from thrashing virtual memory or a failed memory allocation from the

package 集合.list.LinkedList; public class MyLinkedList { //默认长度为0 private int size = 0; Node head = null; Node tail = null; public MyLinkedList() { } //添加元素的方法 public void add(Object obj) { //创建Node Node node = new Node(obj, null, null); //先判断之前的尾部节点 if (size == 0) { this.head = node; } else { Node temp; temp = this.tail; temp.next = node; node.prev = temp; } this.tail = node; size++; } //插入元素 public void add(int index, Object obj) { //先判断索引是否合法 if (index > size || index < 0) { throw new IndexOutOfBoundsException(); } //判断插入位置 if (index == size) { this.add(obj); return; } //创建Node Node node =

I am using the following code to create JTable inside JScrollPane to show column headers JTable won't show column headers String[] columnNames = {"header1", "header2", "header2", "header3"}; Object[][] data = new Object[num][4]; //feed values into data using for JTable chart = new JTable(data, columnNames); chart.setShowVerticalLines(false); chart.setEnabled(false); chart.setAutoResizeMode(JTable.AUTO_RESIZE_OFF); JScrollPane sp = new JScrollPane(chart); sp.setPreferredSize(new Dimension(width, chart.getHeight() + 5)); panel.add(sp); The problem is that I need to compute a height for

I have looked at the similar questions and tried their solutions but it did not work for me. I try to take width of an imageView, but it returns 0. Here is the code: public class MainActivity extends Activity { private ImageView image1; float centerX,centerY; private ImageView image2; private boolean isFirstImage = true; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.rotate); image1 = (ImageView) findViewById(R.id.ImageView01); image2 = (ImageView) findViewById(R.id.ImageView02); image2.setVisibility(View.GONE); if

I instantiate an std::vector foo(1000) . foo.size() is now 1000 and foo.capacity() is also 1000. If I clear the vector with foo.clear() , the size() is now 0, but what is the capacity() ? Does the standard say anything about that? Armen Tsirunyan No, it doesn't. The capacity of a vector never decreases. That isn't mandated by the standard but it's so both in standard library implementations of VC++ and g++. In order to set the capacity just enough to fit the size, use the famous swap trick vector<T>().swap(foo); In C++11 standard, you can do it more explicitly: foo.shrink_to_fit(); To clear a

in c++ class bar { int i; char b; float d; }; void foo ( bar arg ); void foo ( bar &arg ); void foo ( bar *arg ); this is a sample class/struct and functions i have some Qs what's the difference between 1st and 2nd way of passing the argument in 'asm', size, speed ? how the arguments are passed to the functions foo in each case ( in case of pointer i know the pointer is pushed on the stack ) when passing arguments, in terms of efficiency at ( speed, size, preferability ) which is better ? what's the intel 'asm' syntax that corresponds each of the ways of passing arguments ? i know what most