memory-management

问题 I have been browsing for a while and I am trying to understand how memory is allocated to the stack when doing for example: push rax Or moving the stack pointer to allocate space for local variables of a subroutine: sub rsp, X ;Move stack pointer down by X bytes What I understand is that the stack segment is anonymous in the virtual memory space,i.e., not file backed. What I also understand is that the kernel will not actually map an anonymous virtual memory segment to physical memory until

问题 This may be a duplicate question but I couldnt find what I am searching. If it exists, sorry about duplication. I want to learn that if the following part of codes are same in terms of memory allocation. //first int n = some_number; for(int i = 0; i < n; i++){ for(int j = 0; j < n; j++){ int a = something; } } //second int i, j, a; for(i = 0; i < n; i++){ for(j = 0; j < n; j++){ a = something; } } I wonder, if java allocates the variable a n^2 times and j n times in the first code or both are

问题 This may be a duplicate question but I couldnt find what I am searching. If it exists, sorry about duplication. I want to learn that if the following part of codes are same in terms of memory allocation. //first int n = some_number; for(int i = 0; i < n; i++){ for(int j = 0; j < n; j++){ int a = something; } } //second int i, j, a; for(i = 0; i < n; i++){ for(j = 0; j < n; j++){ a = something; } } I wonder, if java allocates the variable a n^2 times and j n times in the first code or both are

问题 What happens in memory when there is a class with 50 methods and we create 50 object instances of that class? What is the best solution for having an object with a lot of functionality and less memory usage? 回答1: Yes, C#/.Net methods require memory on per-AppDomain basis, there is no per-instance cost of the methods/properties. Cost comes from: methods metadata (part of type) and IL. I'm not sure how long IL stays loaded as it really only needed to JIT so my guess it is loaded as needed and

问题 What happens in memory when there is a class with 50 methods and we create 50 object instances of that class? What is the best solution for having an object with a lot of functionality and less memory usage? 回答1: Yes, C#/.Net methods require memory on per-AppDomain basis, there is no per-instance cost of the methods/properties. Cost comes from: methods metadata (part of type) and IL. I'm not sure how long IL stays loaded as it really only needed to JIT so my guess it is loaded as needed and

问题 My Requirement is download all images in application memory and display it from local if its available. Below is my code to access image from local and if its not available then it will download then display. [cell.imgProfilePic processImageDataWithURLString:cData.PICTURE]; I have made custom UIImageView class DImageView.h #import <UIKit/UIKit.h> @interface DImageView : UIImageView @property (nonatomic, strong) UIActivityIndicatorView *activityView; - (void)processImageDataWithURLString:

问题 I have a function that scans a file and returns the number of the lines along with the lines in a string array, my function looks like this : int load_lines(char* _file, char** _array){ FILE *infile; char line_buffer[BUFSIZ]; char line_number; infile = fopen(_file, "r"); ine_number = 0; while (fgets(line_buffer, sizeof(line_buffer), infile)) ++line_number; fclose(infile); _array = malloc (line_number * sizeof(char*)); infile = fopen(_file, "r"); line_number = 0; while (fgets(line_buffer,

问题 This question already has answers here : How to determine CPU and memory consumption from inside a process? (9 answers) Closed 2 years ago . See, I wanted to measure memory usage of my C++ program. From inside the program, without profilers or process viewers, etc. Why from inside the program? Measurements will be done thousands of times—must be automated; therefore, having an eye on Task Manager , top , whatever, will not do Measurements are to be done during production runs —performance

问题 Consider this simple Swift code that logs device motion data to a CSV file on disk. let motionManager = CMMotionManager() var handle: NSFileHandle? = nil override func viewDidLoad() { super.viewDidLoad() let documents = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)[0] as NSString let file = documents.stringByAppendingPathComponent("/data.csv") NSFileManager.defaultManager().createFileAtPath(file, contents: nil, attributes: nil) handle = NSFileHandle

问题 I am using the following piece of code to load images as thumbnails to a FlowLayoutPanel control. Unfortunately i get an OutOfMemory exception. As you already guess the memory leak is found at line Pedit.Image = System.Drawing.Image.FromStream(fs) So how could i optimize the following code? Private Sub LoadImagesCommon(ByVal FlowPanel As FlowLayoutPanel, ByVal fi As FileInfo) Pedit = New DevExpress.XtraEditors.PictureEdit Pedit.Width = txtIconsWidth.EditValue Pedit.Height = Pedit.Width / (4 /