Memory refers to the physical devices used to store programs or data on a temporary or permanent basis for use in a computer or other digital electronic device.
5
votes
2answers
243 views
Are there alternatives to stack+heap+static memory model?
All programs I have seen organize their data memory into one or more call stacks (usually fixed size, but sometimes not), the heap, and static memory. Lately thread-local static storage has been ...
7
votes
4answers
536 views
Why not free memory as soon as its reference counter hits zero [duplicate]
A lot of languages like Java and C# have garbage collectors that free memory when that memory no longer has any reference. Yet they don't immediately free it after the reference counter hits zero but ...
2
votes
2answers
449 views
Help me think in C++
I mainly use dynamic languages. For many years I see statically typed hello world examples like
const int STACK_SIZE = 100;
And I will think "wow, I can't think like that". I understand memory ...
2
votes
1answer
179 views
How does the CPU know when it received RAM data and instructions?
Well, the title is pretty much self explanatory, but I'll expound it a bit, and say the origin of my question.
So, I've been wondering as to how the CPU knows when it received the RAM. I'm pretty ...
0
votes
1answer
95 views
Multiple Instantiate of 1 class affects memory?
I am currently struggling with memory handling. I have an if statement and each case instantiate a new object from a class. Does this affect the memory allocation in java?
switch()
{
case 1:
test t1 ...
2
votes
4answers
368 views
Why do we use to talk about addresses and memory of variable in C?
Why do we use to talk about addresses and memory of variable in C, where in other languages (like in Java, .Net etc) we do not talk about variable address and memory in a program, we will directly use ...
0
votes
2answers
375 views
Can anyone explain representation of float in memory?
This is not duplicate question as I read the previous question.
Can anyone help me in understanding how float values are stored in the memory .
My doubt is here float values contain '.' (for example ...
-1
votes
2answers
82 views
Applications affected by memory performance [closed]
I'm writing a paper on the topic of applications affected more by memory performance than processor performance. I've got a lot written regarding the gap between the two, however I can't seem to find ...
12
votes
1answer
556 views
How important it is to fix memory leaks?
I found by Valgring that some GTK+ programs leaks memory. How important it is to fix those leaks? I mean, often those programs works very well but on the other hand, one can never be sure if one wants ...
3
votes
0answers
199 views
Multiple sites with the same codebase in Python
I am trying to run a large amount of sites which share about 90% of their code. They are simply designed to query an API and return the results. They will have a common userbase / database but will be ...
1
vote
1answer
551 views
External sqlite db file from sdcard in android
I just searched for the same but didn't get the answers. What I have is a db file which is around 100MB. I have saved the db file in sdcard .
Through this db file I'm going to populate the contents ...
0
votes
1answer
136 views
Will having ClassA extend ClassB slow down my runtime performance compared to having classC which contains all the members of ClassC?
I have a class with a lot of methods. I would like to group similar methods together in their own class, but all of the methods need to extend another class, ClassC. So I was thinking of having ...
11
votes
3answers
1k views
What are CPU registers?
This question has been bothering me for some time now and today I figured I would Google it. I've read some stuff about it and it seemed very similar to what I've always known as processor cache.
Is ...
3
votes
2answers
245 views
Methods to identify and resolve memory leaks in the JVM
As the data is migrated via the object level, there has been a slow upwards trend in memory usage. I can see the periodic gc activity, but the memory trend is still going up slowly. I have currently ...
4
votes
1answer
347 views
Does having more classes necessarily increase the memory requirements of the app?
When we add .edmx files to a DLL, the physical size of the DLL increases. DLL's are loaded into memory. However, the .NET infrastructure with functionality such as JIT compilation and the GAC ...
10
votes
2answers
733 views
Haskell memory efficiency - which is the better approach?
We are implementing a matrix compression library based on a modified two dimensional grammar syntax. Now we have two approaches for our data types -which one will be better in case of memory usage? ...
4
votes
2answers
683 views
How are the size of the stack and heap limited by the OS?
Note: if you need to consider a specific OS to be able to answer, please consider Linux.
Whenever I run a program, it will be given a virtual memory space to run in, with an area for its stack and ...
2
votes
2answers
285 views
Flat addressing vs. segmented addressing
Is flat addressing model generally superior to a segmented one? If so, why? If not, what instances would call for each over the other and why?
My understanding of memory models surrounds the ...
2
votes
2answers
274 views
What is the best solution for static memory allocation?
I'm working on image processing and I need to use big Images in a critical system.
A good practice for critical systems is to avoid dynamic allocation of memory but what is the design/recommendations ...
1
vote
1answer
153 views
Improving the efficiency of containers with dynamically allocated objects
This is not strictly related to C++ but its type system serves to illustrate the problem well.
Assume:
We have a generic template Container<T> (such as a std::vector<T>) which stores an ...
5
votes
5answers
370 views
Demonstration of garbage collection being faster than manual memory management
I've read in many places (heck, I've even written so myself) that garbage collection could (theoretically) be faster than manual memory management.
However, showing is a lot harder to come by than ...
2
votes
1answer
83 views
Handling Dynamic amount of Strings for persistent and runtime storage in an IOS App
Background
I am dynamically building an FQL query statement and because of the nature of the app, I exclude FB family members, this is the base portion of the query and remains fairly static. The ...
2
votes
1answer
131 views
Is every object rounded to the same size in Java?
According to this answer every object in Java is of the same size? Is the answer talking about the object itself or the reference to the object?
Here's the statement:
every object size is rounded ...
7
votes
2answers
269 views
Is there a comparative study of the memory consumption of programming languages runtimes, correlated with expressiveness and production bug ratios?
There are many comparative studies and available online when it comes to the runtime performance of applications built using one language or another. Some driven by corporations, some academic, some ...
19
votes
5answers
1k views
How did they debug segmentation faults before protected memory?
Now, when I make a programming mistake with pointers in C, I get a nice segmentation fault, my program crashes and the debugger can even tell me where it went wrong.
How did they do that in the time ...
0
votes
0answers
43 views
Object pooling in managed environments
My application tries to process chunks of data, each sized at tens of megabytes, but not fixed size.
I use a producer for data fetching, and consumer for data processing,
Since I do not control the ...
22
votes
1answer
522 views
Performance of single-assignment ADT oriented code on modern CPUs
Working in immutable data with single assignments has the obvious effect of requiring more memory, one would presume, because you're constantly creating new values (though compilers under the covers ...
2
votes
4answers
252 views
Architecture change from using disk to RAM to read and write key/value pairs coming over a network
A WebApp writes a stream of data coming over a network to disk as key/value pair and then reads & send it over network again after few milliseconds in 99% of case. In 1% of cases write/read can be ...
2
votes
2answers
516 views
How many `malloc` calls is too many? If any?
I'm implementing a system in C, implemented partially as a library. The library does most of the memory management itself, with the application layer just having to call *_destroy functions on the ...
2
votes
4answers
242 views
Should I read a chapter about Memory management if now a days we mostly use ARC?
I'm reading a book on Objective C, and I was wondering about 2 things:
Should I take the time currently to read a whole chapter on memory management?
If you are doing a really good job on manual ...
5
votes
2answers
2k views
Java vs PHP Memory / CPU Consumption
I work in a PHP based company. There is a project where we want to create a backend service. Senior members here are going for PHP, even though it is slower than Java. Their only point of contention, ...
4
votes
3answers
1k views
Methods to share memory or state across JVMs?
This is long question I know. I have a few options for what I want. I don't want to know "this is obviously the best," but maybe any pros or cons I may be missing about the options, as well as any ...
1
vote
3answers
160 views
Please help me understand the relationship between script file size and memory usage?
I am programming in PHP and I have an include file that I have to, well, include, as part of my script. The include file is 400 MB, and it contains an array of objects which are nothing more than ...
2
votes
6answers
184 views
Deterministic and controllable fully automated memory management
Fully automated memory management increases productivity and integrity greatly, but usual implementation (GC) has a critical problem. It's non-deterministic, and not controllable. This causes many ...
8
votes
1answer
306 views
Why is the main memory for object allocation called the 'heap'?
Has anybody got an idea why the area of main memory where objects are allocated is referred to as the heap. I can understand the rationale for that of the stack LIFO but would like to know what the ...
3
votes
2answers
299 views
Purpose of Base Address?
What's the purpose of a base address in an executable?
For example, in Microsoft Visual C++'s linker, you can set a base address, or use the default of 0x1000000. But with virtual memory, why would a ...
2
votes
5answers
481 views
Given that I voluntarily choose not to implement virtual memory in my kernel, how would the memory-management-unit work?
For my basic kernel I refuse to implement the dreaded confusion of virtual memory scheming, so I want only real memory addresses for everything. Some people have argued with me that since virtual ...
4
votes
5answers
618 views
Java memory management (thunks/lazyness)
If I want to create an infinite list of integers in Java like so:
ArrayList<Integer> list = new ArrayList<Integer>();
for(int i = 0;;i++){
list.add(i);
}
I run out of memory. My ...
2
votes
2answers
1k views
Can multiple CPU's / cores access the same RAM simutaneously?
This is what I guess would happen:
If two cores tried to access the same address in RAM, one would have to wait for the other to access the RAM. The second time that each core would try to access ...
4
votes
2answers
1k views
What are the pros and cons of Inter process communication done via sockets vs shared memory?
I understand that two of the many more options for inter process communication can be :
Shared memory
Sockets
Actually I saw these two options being exposed by Intellij Idea for debugging a Java ...
2
votes
2answers
165 views
Possible to implement OOP without using extensive heap operations?
Is the concept of OOP intimately tied to allocating objects on the heap? Is it possible to write normal OOP without creating excessive objects on the heap?
15
votes
4answers
2k views
Is it possible to read memory from another program by allocating all the empty space on a system?
Theoretically, if I were to build a program that allocated all the unused memory on a system, and continued to request more and more memory as other applications released memory that they no longer ...
-1
votes
3answers
215 views
How flexible can hardware get? [closed]
This subject is long time in the making for me and it particularly took off when I was researching bootloaders for computers and consumer electronics, which, I will note, differ drastically. I've ...
1
vote
3answers
1k views
How do you directly touch video memory, or write to video memory, or for a display directly? [closed]
I want to know if there's any documentation, tutorials, or anything really that can help me better grasp the idea of how this is done from the hardware level directly(not just RAMDAC and analog ...
7
votes
3answers
553 views
Why isn't DSM for unstructured memory done today?
Edit: Comments suggested, that DSM just faded out by being not used recently. What were the reasons for this, what are DSMs drawbacks? Literature lists many positive aspects like
easy to port ...
0
votes
3answers
361 views
Instruction vs data cache usage
Say I've got a cache memory where instruction and data have different cache memories ("Harvard architecture"). Which cache, instruction or data, is used most often? I mean "most often" as in time, not ...
2
votes
2answers
150 views
Browser support for internal corporate tools
We are on the verge of a conversion. For years, our company supported only IE for its internal (intranet) home-built tools.
Since a few of our users are still on XP, which means IE only goes up to ...
0
votes
1answer
294 views
Increase the size of a memory mapped file
I am maintaning a memory mapped file to store my tree like datastructure.
When I'm updating the datastructure ,I got this problem.
The file is limited on it's size and can't be too long or too small.
...
0
votes
0answers
119 views
Where are the Interface information stored?
I would like to know whether the information in an interface such as the variables which are final and the methods which are abstract and static would all live in method area ???
And what would be ...
5
votes
3answers
632 views
Tension between the dependency inversion principle and avoiding “new” in C++?
I have seen a lot of advice that it is better to do Type object; than
Type* object = new Type();
in C++ whenever possible—i.e., minimize your use of new. I understand the rational behind this and ...
