memory-management

问题 This question already has an answer here : Memory allocation for const in C# (1 answer) Closed 6 years ago . The title of the question is self explanatory. I wonder if a member that is declared const is singleton for all instances of the class or each instance has it's own copy. I've read some questions about const but most of them refer to const variables inside a method. 回答1: Constants are usually something that can be evaluated compile time and compiler is likely to replace it with the

问题 This question already has an answer here : Memory allocation for const in C# (1 answer) Closed 6 years ago . The title of the question is self explanatory. I wonder if a member that is declared const is singleton for all instances of the class or each instance has it's own copy. I've read some questions about const but most of them refer to const variables inside a method. 回答1: Constants are usually something that can be evaluated compile time and compiler is likely to replace it with the

问题 This question already has an answer here : Memory allocation for const in C# (1 answer) Closed 6 years ago . The title of the question is self explanatory. I wonder if a member that is declared const is singleton for all instances of the class or each instance has it's own copy. I've read some questions about const but most of them refer to const variables inside a method. 回答1: Constants are usually something that can be evaluated compile time and compiler is likely to replace it with the

问题 As far as i know, std::string creates a ident array-copy of its content when you call the c_str() / data() methods (with/out terminating NUL-char, does not matter here). Anyway, does the object also take care of freeing this array or do I have to? In short: std::string hello("content"); const char* Ptr = hello.c_str(); // use it.... delete[] Ptr; //// really ??? I just want to be on the safe side when it comes to memory allocation. 回答1: No you don't need to deallocate the ptr pointer. ptr

问题 We have ~300 celeryd processes running under Ubuntu 10.4 64-bit , in idle every process takes ~19mb RES, ~174mb VIRT, thus - it's around 6GB of RAM in idle for all processes. In active state - process takes up to 100mb of RES and ~300mb VIRT Every process uses minidom(xml files are < 500kb, simple structure) and urllib. Quetions is - how can we decrease RAM consuption - at least for idle workers, probably some celery or python options may help? How to determine which part takes most of memory

问题 I found that kmalloc returns physically and virtually contiguous memory. I wrote some code to observe the behavior, but only the physical memory seems to be contiguous and not the virtual. Am I making any mistake? #include <linux/kernel.h> #include <linux/module.h> #include <linux/slab.h> #include <linux/moduleparam.h> MODULE_LICENSE("GPL"); static char *ptr; int alloc_size = 1024; module_param(alloc_size, int, 0); static int test_hello_init(void) { ptr = kmalloc(alloc_size,GFP_ATOMIC); if(

问题 I found that kmalloc returns physically and virtually contiguous memory. I wrote some code to observe the behavior, but only the physical memory seems to be contiguous and not the virtual. Am I making any mistake? #include <linux/kernel.h> #include <linux/module.h> #include <linux/slab.h> #include <linux/moduleparam.h> MODULE_LICENSE("GPL"); static char *ptr; int alloc_size = 1024; module_param(alloc_size, int, 0); static int test_hello_init(void) { ptr = kmalloc(alloc_size,GFP_ATOMIC); if(

问题 below is a code example from a book to show when a value type will be boxed: internal struct Point { private readonly Int32 m_x, m_y; public Point(Int32 x, Int32 y) { m_x = x; m_y = y; } //Override ToString method inherited from System.ValueType public override string ToString() { return String.Format("({0}, {1})", m_x.ToString(), m_y.ToString()); } } class Program { static void Main(string[] args) { Point p1 = new Point(10, 10); p1.ToString(); } } and the author says: In the call to ToString

问题 below is a code example from a book to show when a value type will be boxed: internal struct Point { private readonly Int32 m_x, m_y; public Point(Int32 x, Int32 y) { m_x = x; m_y = y; } //Override ToString method inherited from System.ValueType public override string ToString() { return String.Format("({0}, {1})", m_x.ToString(), m_y.ToString()); } } class Program { static void Main(string[] args) { Point p1 = new Point(10, 10); p1.ToString(); } } and the author says: In the call to ToString

问题 below is a code example from a book to show when a value type will be boxed: internal struct Point { private readonly Int32 m_x, m_y; public Point(Int32 x, Int32 y) { m_x = x; m_y = y; } //Override ToString method inherited from System.ValueType public override string ToString() { return String.Format("({0}, {1})", m_x.ToString(), m_y.ToString()); } } class Program { static void Main(string[] args) { Point p1 = new Point(10, 10); p1.ToString(); } } and the author says: In the call to ToString