Recent questions tagged Memory

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memory management - How do I choose heap allocation vs. stack allocation in C++?

One of the C++ features that sets it apart from other languages is the ability to allocate complex objects as ... 's allocated on the stack? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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memory - C++ struct alignment question

I have a predefined struct (actually several) where variables span across 32-bit word boundary. In Linux (and Windows ... not to. Any ideas? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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memory leaks - How to garbage collect a direct buffer in Java

I have a memory leak that I have isolated to incorrectly disposed direct byte buffers. ByteBuffer buff = ByteBuffer. ... (); do not work. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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memory management - How to create a list or tuple of empty lists in Python?

I need to incrementally fill a list or a tuple of lists. Something that looks like this: result = [] firstTime = ... to get what I'm looking for See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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memory management - C++ object created with new, destroyed with free(); How bad is this?

I am working on modifying a relatively large C++ program, where unfortunately it is not always clear whether ... one of the many problems. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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memory - Class members that are objects - Pointers or not? C++

If I create a class MyClass and it has some private member say MyOtherClass, is it better to make ... pointers when they are classes. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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memory - What is the best way to add a value to an array in state

I have an array in state, let's say this.state.arr. I want to add something to this state property, and ... always first making a copy in memory See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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memory management - Difference between logical addresses, and physical addresses?

I am reading Operating Systems Concept and I am on the 8th chapter! However I could use some clarification, ... my understanding is incorrect. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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memory - Understanding the Linux oom-killer's logs

My app was killed by the oom-killer. It is Ubuntu 11.10 running on a live USB with no swap and the PC has 1 Gig of ... 0 gvfsd-trash [11686.043588] [ 2640] 999 2640 1933 85 0 0...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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memory - How does Java (JVM) allocate stack for each thread

A Java application starts up with one heap for all threads. Each thread has its own stack. When a Java ... may threads will be created? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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memory - How do I determine the correct "max-old-space-size" for node.js?

I'm having some trouble to understand how Node.js acts based on the parameter max-old-space-size. ... everything about node internals. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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memory - How do C++ progs get their return value, when a return is not specified in the function?

I recently wrote a post: Weird Error in C++ Program: Removing Printout Breaks Program ...in which I was trying ... return value from?? Thanks!! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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memory segmentation - Segment size in x86 real mode

I have one doubt regarding the size of segments in real mode as they can't be more than 64K but can be less ... need to do something like that ? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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memory - intrinsic memcmp

According to the gcc docs, memcmp is not an intrinsic function of GCC. If you wanted to speed up glibc's ... some compilers and not for others? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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memory - How to avoid long chain of free's (or deletes) after every error check in C?

Suppose I write my code very defensively and always check the return types from all the functions that I call. So ... out. Thanks, Boda Cydo. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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memory management - How many bytes per element are there in a Python list (tuple)?

For example, how much memory is required to store a list of one million (32-bit) integers? alist = range(1000000 ... (1000000)) in Python 3.0 See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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memory - translate virtual address to physical address

The following page table is for a system with 16-bit virtual and physical addresses and with 4,096-byte pages. The ... it did not help me much. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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memory management - C++ Push Multiple Types onto Vector

Note: I know similar questions to this have been asked on SO before, but I did not find them helpful or very ... ? Thank you for your time. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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memory - Drawbacks of using /LARGEADDRESSAWARE for 32 bit Windows executables?

We need to link one of our executables with this flag as it uses lots of memory. But why give one EXE file ... as standard for all EXE files? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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memory - Difference between word addressable and byte addressable

Can someone explain what's the different between Word and Byte addressable? How is it related to memory size etc.? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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memory - Why freed struct in C still has data?

When I run this code: #include <stdio.h> typedef struct _Food { char name [128]; } Food; int main (int ... is this? Is memory really freed? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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memory management - Mex files: how to return an already allocated matlab array

I have found a really tricky problem, which I can not seem to fix easily. In short, I ... and use mxCreateSharedDataCopy and mxUnshareArray. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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memory management - Is there a minimal heap size for Android versions?

Many posts have talked about Android heap size, and so far what I've found out is that the only common thing about ... 't use any more of this. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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memory management - How to free 2d array in C?

I have the following code: int **ptr = (int **)malloc(sizeof(int*)*N); for(int i=0;i<N;i++) ptr[i]= ... just do free(ptr) and ptr will be freed? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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memory - Python deep getsizeof list with contents?

I was surprised that sys.getsizeof( 10000*[x] ) is 40036 regardless of x: 0, "a", 1000*"a", ... python-allocate-new-memory-for-identical-strings See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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memory - What are uses of the C++ construct "placement new"?

I just learned about the C++ construct called "placement new". It allows you to exactly control where a ... the same location in memory. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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memory leaks - Does Python GC deal with reference-cycles like this?

Using objgraph, I found a bunch of objects like this: Will Python's garbage collector deal with cycles like this, ... wider view of the loop: See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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memory - GCC's reordering of read/write instructions

Linux's synchronization primitives (spinlock, mutex, RCUs) use memory barrier instructions to force the memory access ... very useful. Thanks! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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