memory

In c program, why free memory of string (which copy from strcpy) in osx is not woking? [duplicate]

由 生来就可爱ヽ(ⅴ＜●) 提交于 2020-01-08 02:20:14
问题 This question already has answers here : Freeing malloced structure in a function (4 answers) Closed 2 years ago . my osx version is 10.12, when I copy string from origin string , then free it, it's not working, But in linux(centos 6.2) is ok, I print copy is invalid. I don't find the reason, It's really confused me. here is code: #include <string.h> #include <stdlib.h> #include <stdio.h> int main(){ char *copy; char *origin = "tutorialspoint"; copy = (char *) malloc(15); strcpy(copy, origin)

关于 Out of Socket memory 的解释

由 孤街醉人 提交于 2020-01-07 20:07:05
【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 关于 Out of Socket memory 的解释 1. 原因分析 一台 Nginx server，到晚上高峰 messages 出现大量的如下信息： Apr 23 22:43:21 rs1 kernel: [...] Out of socket memory 两种情况会出发 "Out of socket memory" 的信息： 1.有很多的孤儿套接字(orphan sockets) 2.tcp socket 用尽了给他分配的内存 首先看看情况 2。对于 TCP socket 来说，使用 pages 来计数的，而非 bytes，一般情况下 1 page = 4096 bytes。page 大小可以通过下面命令获得： $ getconf PAGESIZE 4096 查看内核分配了多少的内存给 TCP： $ cat /proc/sys/net/ipv4/tcp_mem 69618 92825 139236 第一个数字表示，当 tcp 使用的 page 少于 69618 时，kernel 不对其进行任何的干预 第二个数字表示，当 tcp 使用了超过 92825 的 pages 时，kernel 会进入 “memory pressure” 第三个数字表示，当 tcp 使用的 pages 超过 139236 时

Segfault doesn't happen [duplicate]

由 别来无恙 提交于 2020-01-07 09:01:25
问题 This question already has answers here : Undefined, unspecified and implementation-defined behavior (8 answers) Closed 3 years ago . I have the following c code: #include <stdint.h> #include <stdio.h> int main (){ uint8_t *array; int i=0; for(;i<32120;i++) printf("Array[%d] = %d \n",i,*(array+i)); } As I don't declare the memory for array, I would expect this code to segfault on the second iteration, but it's not the case (it happens at i==3295 on my raspberry, and larger random i value on my

The Android ION memory allocator

由 风流意气都作罢 提交于 2020-01-07 08:21:56
【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> Back in December 2011, LWN reviewed the list of Android kernel patches in the linux-next staging directory. The merging of these drivers, one of which is a memory allocator called PMEM, holds the promise that the mainline kernel release can one day boot an Android user space. Since then, it has become clear that PMEM is considered obsolete and will be replaced by the ION memory manager . ION is a generalized memory manager that Google introduced in the Android 4.0 ICS (Ice Cream Sandwich) release to address the issue of fragmented memory management

Better Memory (Heap) management on Solaris 10

由 假如想象 提交于 2020-01-07 06:55:11
问题 I have c code with embedded SQL for Oracle through Pro*C. Whenever I do an insert or update (below given an update example), update TBL1 set COL1 = :v, . . . where rowid = :v To manage bulk insertions and updates, I have allocated several memory chunks to insert as bulk and commit once. There are other memory allocations too going on as and when necessary. How do I better manage the memory (heap) for dynamic memory allocations? One option is to have the heap size configurable during the GNU

Android Load Images from Drawable Efficiently

由 我的未来我决定 提交于 2020-01-07 06:54:08
问题 I'm new to Android development and I've had a lot of difficulty figuring out how to load images efficiently. The short version of my question is as follows: I have some png images in my res/drawable folder. How can I load these images onto an Android device without risking an OutOfMemory error? Here are some more details about my problem and my attempts to fix it: I've written a very simple program that simply displays one image. Here's the code: public class TitleScreenActivity extends

Multiple https requests.. how to?

由 百般思念 提交于 2020-01-07 05:21:22
问题 I have an https API URL which I need to run multiple times, and as quickly as possible to check the status of a domain. How can I run the same URL multiple times concurrently, while receiving the response in output, and closing the finished connection, whilst also keeping memory resources as low as possible? I was told to use threading in another language (not PHP)? Any examples or lending hand would be greatly appreciated! Thanks 回答1: Just did a quick google and came up with this, I believe

Need to free memory after Modal Segues, but I need both my Segues to pass data from A to B and B to A

由 穿精又带淫゛_ 提交于 2020-01-07 05:03:09
问题 I am making a game for iOS with SpriteKit. I have 2 Viewcontrollers. One is the GameViewController and the other one is the MenuViewController. Let's call them A and B respectively. When the player dies, a function is called in GameScene.swift that launches a modal "Lost" Segue to B. There, the player can restart the game or buy a life and a "Back" Segue is called to A. I need to dismiss the additional Views that get created each time I call a segue. Problem is: I need the "Lost" Segue to

iPad1 memory mystery with my texture-intensive game app

由 感情迁移 提交于 2020-01-07 04:28:40
问题 Sorry for the vague title, but not quite sure how to summarize this one. The facts are: I have a game that's been approved by Apple and is on the App Store. It is a universal app. It uses textures designed for 320x480 on small screens, and uses larger textures (roughly four times as large) on retina and iPad screens. While developing it, I would sometimes see low-memory warnings in the console log, but after reading about these it seemed like they were often somewhat spurious/unimportant, and

What is the virtual Memory? [closed]

由 六月ゝ 毕业季﹏ 提交于 2020-01-07 03:09:33
问题 It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center. Closed 8 years ago . What is virtual memory? Hello Virtual memory in Linux is quite done? 回答1: Virtual memory is a technique implemented in most every modern operating system, that allow the user to address a virtual quantity of
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