stack-memory

Why each slot of the local variable array in a stack frame is of 4 bytes, and not 1 byte in the JVM?

由 坚强是说给别人听的谎言 提交于 2020-01-04 11:03:29
问题 Each slot of local variable array is of 4-bytes. So to store a character, short or byte variables one slot is used. Means all smaller data-types internally gets converted into int data type. My doubt is: 1). Is it not making smaller data types useless, if internally they are of 4-bytes?, If yes, Why not remove such data-types from the language? 2). If each slot is of 1-byte then there will be no wastage of memory. Why not each slot is of 1-byte? 回答1: 1). Is it not making smaller data types

How is heap and stack memories mananged, implemented, allocated [duplicate]

由 隐身守侯 提交于 2020-01-01 00:45:10
问题 This question already has answers here : Closed 10 years ago . Possible Duplicates: How is heap and stack memories mananged, implemented, allocated? Stack,Static and Heap in C++ In C/C++ we can store variables, functions, member functions, instances of a class either on a stack or a heap. How is each implemented? How is it managed (high level)? Does gcc preallocates a chunk of memory to be used for the stack and heap, and then doles out on request? Is original memory coming from RAM? Can a

How does string works in c#? [closed]

由 笑着哭i 提交于 2019-12-14 03:38:27
问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 3 years ago . I know strings are inmutable, once created we cannot change it, I've read that if we create a new string object and we assign a value to it and then we assign another value to the same string object internally there is actually another object created and assigned with the new

Measure static, heap and stack memory ? (c++, Linux - Centos 7)

由 杀马特。学长 韩版系。学妹 提交于 2019-12-13 03:05:52
问题 I would like to measure stack, heap and static memory separately because I have some constraints for each one. To measure the heap memory I'm using valgrind->massif tool. Massif should also be possible to measure heap AND stack memory but it shows strange resultats : Last snapshot without --stacks=yes provides total(B)=0, useful-heap(B)=0, extra-heap(B)=0 (so all is fine) Last snapshot with --stacks=yes provides total(B)= 2,256, useful-heap(B)=1,040, extra-heap(B)=0, stacks(B)=1,208 (which

Memory allocation by java

由 邮差的信 提交于 2019-12-07 14:41:29
问题 Problem : I have setted Xms512m and Xmx1024m for running application which intern use C++ native layer for performing other operation, I am getting OutOfMemory exception when running application. I need to know C++ uses which memory (ie from assigned memory Xms512m and Xmx1024m or it uses other than this setted memory). How to get heap space and stack space for Java and C++ code while running application separately. 回答1: The memory allocated by native code is not in the Java Heap. Your

How to measure a functions stack usage in C?

由 笑着哭i 提交于 2019-12-04 22:15:15
问题 Is there a way I can measure how much stack memory a function uses? This question isn't specific to recursive functions; however I was interested to know how much stack memory a function called recursively would take. I was interested to optimize the function for stack memory usage; however, without knowing what optimizations the compiler is already making, it's just guess-work if this is making real improvements or not. To be clear, this is not a question about how to optimize for better

How is heap and stack memories mananged, implemented, allocated [duplicate]

由 淺唱寂寞╮ 提交于 2019-12-03 03:57:07
Possible Duplicates: How is heap and stack memories mananged, implemented, allocated? Stack,Static and Heap in C++ In C/C++ we can store variables, functions, member functions, instances of a class either on a stack or a heap. How is each implemented? How is it managed (high level)? Does gcc preallocates a chunk of memory to be used for the stack and heap, and then doles out on request? Is original memory coming from RAM? Can a function be allocated on the heap instead of a stack? --Clarification-- I am really asking about implementation and management of heap and stack memories. After reading

Java stack and heap memory management

由 只愿长相守 提交于 2019-12-03 02:10:54
问题 I want to know how the memory is being allocated in the following program: public class MemoryClass { public static void main(final String[] args) { int i = 0; MemoryClass memoryClass = new MemoryClass(); memoryClass.myMethod(memoryClass); } private void myMethod(final Object obj) { int i = 1; String s = "HelloWorld!"; } } Now, as far as my understanding goes, the following diagram describes how the memory allocation takes place: In the above diagram, memory , obj and s , which are in the

Java stack and heap memory management

由 一笑奈何 提交于 2019-12-02 14:15:30
I want to know how the memory is being allocated in the following program: public class MemoryClass { public static void main(final String[] args) { int i = 0; MemoryClass memoryClass = new MemoryClass(); memoryClass.myMethod(memoryClass); } private void myMethod(final Object obj) { int i = 1; String s = "HelloWorld!"; } } Now, as far as my understanding goes, the following diagram describes how the memory allocation takes place: In the above diagram, memory , obj and s , which are in the stack memory, are actually the references to their " actual objects " which are placed inside the heap

memory allocation in Stack and Heap

由 假如想象 提交于 2019-11-30 03:14:35
This may seem like a very basic question, but its been in my head so: When we allocate a local variable, it goes into stack. Similarly dynamic allocation cause the variable to go on heap. Now, my question is, is this variable actually lie on stack or heap or we will just a reference in the stack and Heap. For example, Suppose I declare a variable int i . Now this i is allocated on the stack. So, when I print the address of i , this will be one of the location on stack? Same question for heap as well. Chris Eberle I'm not entirely sure what you're asking, but I'll try my best to answer. The
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