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Questions tagged [memory-allocation]

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7 votes
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When there's no memory, should malloc or read/write fail?

To my surprise, I recently found out that Windows would fail a large memory allocation even if little of said memory is to actually be used, e.g. even if you don't want the swap, you better not ...
cnst's user avatar
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3 votes
0 answers
36 views

Rearrange items in order reduce fragmentation and reduce wasted space

I have a segment with some offsets at irregular intervals There are items of various length inside. Items cannot be placed randomly. Instead, their left side must match some offset. Items are free ...
Elia Perantoni's user avatar
2 votes
1 answer
181 views

Constant-time adding an element?

Is a computer with infinite memory and infinite word size a Turing machine equivalent (in the sense that polynomial time remains polynomial time and exponential time remains exponential time) if we ...
porton's user avatar
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2 votes
0 answers
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Sweeping integrated into memory allocation: Why only fixed size objects?

In our language design book, it is mentioned that GC sweep can be integrated into allocation, such that when you call malloc for example, you sweep until you find a ...
user avatar
1 vote
0 answers
27 views

Addresses with no memory allocated

I've read that a program can crash if it tries to access addresses with no memory allocated. But, how is it possible that an address has no memory allocated? When does it happen?
Jhdoe's user avatar
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19 views

Data structure for arguments in Arrow functions in JS

As per the rules of JS, Arrow functions don't have an argument Object, like a regular function inside JS. But it is also true, that we can pass arguments to the <...
Karan Bakshi's user avatar
0 votes
1 answer
57 views

Memory allocation algorithm over a growing storage

I am going to story data in a growable persistent storage. I need to implement allocation/deallocation (like malloc/free and possibly realloc but in Rust) of continuous regions of memory on this ...
porton's user avatar
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How do you work out the segmentation table, offset and frame size in segmented memory management?

If I had a process, 1, which has the following segments: Segment 1 - 50 bytes Segment 2 - 200 bytes Segment 3 - 90 bytes and I know that the total bytes in memory is 1024, how do I work out the offset/...
Anthony's user avatar
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memory management - interview question

I was asked the following question in an interview and I don't understand what is the best solution for it - Assume you have an application that needs memory. It asks for a program for this memory, 20 ...
tas1's user avatar
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Can I have 2 free adjacent nodes in the fit algorithm for data management

so I know we can have 2 busy adjacent nodes for the fit algo since there'll always be free memory available, but what about when it comes to 2 free adjacent nodes? Is it possible to have 2 adjacent ...
Angelic Demonic's user avatar
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74 views

Concurrent Garbage-Collectiong/Compacting Memory Allocator

I'm developing an algorithm for concurrent heap garbage collection/compaction. It will be used in low latency systems that need to scale well to a lot of clients, e.g. web servers. I thought about an ...
thebear8's user avatar
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Unbanked access, banked access and common memory access

What are they and what are their differences? Unbanked access Banked access Common memory access [EDIT] This question is originated from my reading of MPLAB XC8 PIC Assembler User's Guide where the ...
KMC's user avatar
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Direct Mapped Cache, textbook excerpt clarification, identifying block field

I have an excerpt from my textbook concerning direct mapped cache that I would like further clarification on, the text reads..... "Consider the following example: Assume memory consists of 2^14 ...
Thomas Lee's user avatar
-2 votes
1 answer
746 views

Converting physical address to logical

In 8-bit address space there are 16 pages and the page table stores: 68792EA51BD3CF04 (hex) The physical address is 39h, what is the corresponding logical address? I have literally no idea what to ...
Shuubi's user avatar
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