Questions tagged [ram]
RAM (Random Access Memory) is a form of computer data storage. A random access device allows stored data to be accessed in very nearly the same amount of time for any storage location, so data can be accessed quickly in any random order.
2,341
questions
762
votes
36
answers
214k
views
Sorting 1 million 8-decimal-digit numbers with 1 MB of RAM
I have a computer with 1 MB of RAM and no other local storage. I must use it to accept 1 million 8-digit decimal numbers over a TCP connection, sort them, and then send the sorted list out over ...
505
votes
21
answers
699k
views
How to get current CPU and RAM usage in Python?
How can I get the current system status (current CPU, RAM, free disk space, etc.) in Python? Ideally, it would work for both Unix and Windows platforms.
There seems to be a few possible ways of ...
- 13k
256
votes
12
answers
551k
views
How to see top processes sorted by actual memory usage?
I have a server with 12G of memory. A fragment of top is shown below:
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND ...
- 5,113
141
votes
6
answers
174k
views
What are the differences between virtual memory and physical memory?
I am often confused with the concept of virtualization in operating systems. Considering RAM as the physical memory, why do we need the virtual memory for executing a process?
Where does this virtual ...
- 5,854
139
votes
6
answers
171k
views
Why does VS Code require so much memory? How can I make it run more memory-efficiently?
Does anyone know how to make VS Code use less memory?
It´s taking more than 2gb, sometimes more than 3 gigabytes to have some 8 files opened.
- 2,126
138
votes
16
answers
278k
views
How can I find out the total physical memory (RAM) of my linux box suitable to be parsed by a shell script?
I'm typing a shell script to find out the total physical memory in some RHEL linux boxes.
First of all I want to stress that I'm interested in the total physical memory recognized by kernel, not just ...
- 3,035
133
votes
10
answers
116k
views
Google Colaboratory: misleading information about its GPU (only 5% RAM available to some users)
update: this question is related to Google Colab's "Notebook settings: Hardware accelerator: GPU". This question was written before the "TPU" option was added.
Reading multiple excited announcements ...
- 5,756
126
votes
7
answers
299k
views
MySQL maximum memory usage
I would like to know how it is possible to set an upper limit on the amount of memory MySQL uses on a Linux server.
Right now, MySQL will keep taking up memory with every new query requested so that ...
Timothy Mifsud
111
votes
16
answers
292k
views
How do I check CPU and Memory Usage in Java?
I need to check CPU and memory usage for the server in java, anyone know how it could be done?
- 1,123
92
votes
1
answer
113k
views
How does the "number of workers" parameter in PyTorch dataloader actually work?
If num_workers is 2, Does that mean that it will put 2 batches in the RAM and send 1 of them to the GPU or Does it put 3 batches in the RAM then sends 1 of them to the GPU?
What does actually happen ...
- 1,471
74
votes
7
answers
202k
views
how much memory can be accessed by a 32 bit machine?
What is meant by 32bit or 64 bit machine?
It’s the processor architecture…a 32 bit machine can read and write 32bit data at a time same way with 64 bit machine….
whats the maximum memory that a 32 ...
- 2,033
73
votes
5
answers
280k
views
How to delete multiple pandas (python) dataframes from memory to save RAM?
I have lot of dataframes created as part of preprocessing. Since I have limited 6GB ram, I want to delete all the unnecessary dataframes from RAM to avoid running out of memory when running ...
- 8,574
51
votes
4
answers
43k
views
How to check the amount of RAM
I want to make a function that imports data in different numbers of batches depending on how much RAM is available on someone's system. But how can I find the amount of available RAM in R? I can use ...
- 47k
51
votes
1
answer
53k
views
what's the difference between working set and commit size?
when debugging OOM bugs, what's the difference between working set and commit size? Especially what's the exact meaning for commit size?
- 20.8k
50
votes
2
answers
29k
views
Unmanaged memory and Managed memory
what exactly are un-managed and managed memory?
can anybody explain me in brief?
Also, what exactly would mean when the managed-memory concept is taken to RAM, calling managed-RAM. What are some of ...
- 9,574
47
votes
4
answers
71k
views
Limit RAM usage to python program
I'm trying to limit the RAM usage from a Python program to half so it doesn't totally freezes when all the RAM is used, for this I'm using the following code which is not working and my laptop is ...
- 1,411
42
votes
9
answers
53k
views
get server ram with php
Is there a way to know the avaliable ram in a server (linux distro) with php (widthout using linux commands)?
edit: sorry, the objective is to be aware of the ram available in the server / virtual ...
- 10.9k
40
votes
2
answers
37k
views
High Java memory usage even for small programs
I have a couple of simple applications written in java, one of them written to act as a widget. What surprised me how much RAM even small applications use.
I wrote the following to see if it is a bug ...
- 401
38
votes
4
answers
45k
views
How can I create a RAM disk programmatically?
I am not looking for a code that invokes a command line utility, which does the trick. I am actually interested to know the API used to create a RAM disk.
EDIT
Motivation: I have a third party ...
- 60.3k
37
votes
5
answers
42k
views
R reading a huge csv
I have a huge csv file. Its size is around 9 gb. I have 16 gb of ram. I followed the advises from the page and implemented them below.
If you get the error that R cannot allocate a vector of length ...
- 6,228
33
votes
4
answers
44k
views
How do you determine the amount of Linux system RAM in C++?
I just wrote the following C++ function to programmatically determine how much RAM a system has installed. It works, but it seems to me that there should be a simpler way to do this. Am I missing ...
- 402k
32
votes
6
answers
50k
views
How to get total RAM size of a device?
I want to get full RAM size of a device. memoryInfo.getTotalPss() returns 0. There is not function for get total RAM size in ActivityManager.MemoryInfo.
How to do this?
- 423
32
votes
5
answers
56k
views
How to get CPU usage and RAM usage without exec?
How does VBulletin get the system information without the use of exec? Is there any other information I can get about the server without exec? I am interested in:
bandwidth used
system type
CPU speed/...
- 4,733
32
votes
9
answers
55k
views
How to get current CPU and RAM usage in C++?
is it possible, in C++, to get the current RAM and CPU usage? Is there a platform-indepentent function call?
- 23.6k
32
votes
3
answers
34k
views
How does the internal implementation of memcpy work?
How does the standard C function 'memcpy' work? It has to copy a (large) chunk of RAM to another area in the RAM. Since I know you cannot move straight from RAM to RAM in assembly (with the mov ...
- 858
32
votes
1
answer
33k
views
How to see Linux' view of the RAM in order to determinate the fragmentation
The only program relevant I know of is pmap, but this only prints the memory of one process.
I would like to see how the physical memory is occupied and by which processes/library, including the ...
- 13.7k
32
votes
2
answers
27k
views
Why is Pandas Concatenation (pandas.concat) so Memory Inefficient?
I have about 30 GB of data (in a list of about 900 dataframes) that I am attempting to concatenate together. The machine I am working with is a moderately powerful Linux Box with about 256 GB of ram. ...
- 2,083
30
votes
4
answers
8k
views
How does random access memory work? Why is it constant-time random-access?
Or in other words, why does accessing an arbitrary element in an array take constant time (instead of O(n) or some other time)?
I googled my heart out looking for an answer to this and did not find a ...
- 3,370
27
votes
2
answers
12k
views
Redis: Database Size to Memory Ratio?
What is Redis's database size to memory ratio?
For instance, if I have an 80MB database, how much RAM will Redis use (when used with a normal web app)?
26
votes
2
answers
10k
views
How are the gather instructions in AVX2 implemented?
Suppose I'm using AVX2's VGATHERDPS - this should load 8 single-precision floats using 8 DWORD indices.
What happens when the data to be loaded exists in different cache-lines? Is the instruction ...
- 803
26
votes
7
answers
19k
views
Need to load the whole postgreSQL database into the RAM
How do I put my whole PostgreSql database into the RAM for a faster access?? I have 8GB memory and I want to dedicate 2 GB for the DB. I have read about the shared buffers settings but it just caches ...
- 623
25
votes
6
answers
21k
views
AndroidStudio show usage of RAM
I have seen on other AndroidStudio-pictures, that there is a RAM usage at the right bottom. I tried to setup this statuslist o the bottom. But a rightclick didn`t help me. How can I switch on the RAM ...
- 383
24
votes
6
answers
155k
views
How much RAM is SQL Server actually using? [closed]
I am debugging one of my apps and noticed that the RAM on my SQL Server 2005 x64 box (running on a Windows 2003 R2 x64 ) is pegged and even going into the paging file.
I understand that SQL Server ...
- 60.5k
22
votes
2
answers
22k
views
Elastic search high memory consumption
Elastic search is occupying more than 25 GBs of RAM. Data that I gave for indexing to elastic search is around 1 GB. Why elastic search needs this much of space?
- 4,897
22
votes
1
answer
69k
views
Android memory types (RAM v Internal Memory)
On a separate thread I demonstrated my ignorance of memory types by asking about the best way to copy a file into "internal memory" and was advised that this was not a good idea and that it would be ...
- 3,614
21
votes
3
answers
47k
views
How can I add memory to an Azure virtual machine?
Is it possible to add a "custom" size memory to an Azure virtual machine?
For example, I'm using the Medium size - 2 core, 4GB RAM, I would like to have 8GB RAM with the current settings I have... ...
- 2,627
21
votes
10
answers
11k
views
Why are 8 and 256 such important numbers in computer sciences?
I don't know very well about RAM and HDD architecture, or how electronics deals with chunks of memory, but this always triggered my curiosity:
Why did we choose to stop at 8 bits for the smallest ...
- 1,017
21
votes
3
answers
49k
views
Limiting node.js's memory usage
I am trying to limit a node.js application from using to much memory and I've found out about the --max-stack-size & --max_executable_size options that are available within V8 to pass when ...
- 42.1k
20
votes
3
answers
43k
views
Read file in chunks - RAM-usage, reading strings from binary files
I'd like to understand the difference in RAM-usage of this methods when reading a large file in python.
Version 1, found here on stackoverflow:
def read_in_chunks(file_object, chunk_size=1024):
...
- 957
19
votes
2
answers
6k
views
Data size in memory vs. on disk
How does the RAM required to store data in memory compare to the disk space required to store the same data in a file? Or is there no generalized correlation?
For example, say I simply have a ...
- 191
19
votes
3
answers
8k
views
Enhanced docker stats command with total amount of RAM and CPU
I just want to share a small script that I made to enhance the docker stats command.
I am not sure about the exactitude of this method.
Can I assume that the total amount of memory consumed by the ...
- 496
18
votes
2
answers
33k
views
How to check allocated memory for WSL Docker?
I want to increase allocated RAM for WSL. I have created in my root /users/ .wslconfig. How does it looks:
[wsl2]
memory=6GB
swap=0
localhostForwarding=true
I did wsl --shutdown and then started WSL ...
- 909
18
votes
1
answer
9k
views
Python `open` function memory usage
Does Python interpreter load all the file to RAM when it is opened for writing?
with open('file.txt' 'w') as file:
file.write(some_content)
- 30.4k
18
votes
1
answer
696
views
We need to preallocate. But MATLAB does not preallocate the preallocation?
While testing if any() short-circuits (it does!) I found out the following interesting behavior when preallocating the test variable:
test=zeros(1e7,1);
>> tic;any(test);toc
Elapsed time is 2....
- 35.4k
18
votes
2
answers
6k
views
How can I ask windows about if the RAM is running in single, dual or quad channel?
How can I detect the current RAM config? I need to ask windows about if the RAM is currently running in single, dual or quad channel.
I have searched a lot, and not found any similar questions on ...
- 1,084
15
votes
19
answers
6k
views
Will multi threading provide any performance boost?
I am new to programming in general so please keep that in mind when you answer my question.
I have a program that takes a large 3D array (1 billion elements) and sums up elements along the various ...
- 11.6k
15
votes
3
answers
16k
views
php zip archive memory, ram and max file size
I have folders that have user generated images that get rather large. When trying to zip these I am getting errors around 1.5 gig sized zip files.
My questions have to do with memory and I think ...
- 416
15
votes
3
answers
20k
views
How to get application memory usage as shown in Task Manager?
I am trying to get the memory usage of my application but for some reason i am getting different size than in task manager
I am using:
Task manager shows that my application occupies 45mb , while ...
- 4,871
15
votes
2
answers
10k
views
Why isn't RAM as fast as registers/cache memory? [closed]
Why do we need to cache in Cache Memory? Why cant RAM Memory be made as fast as register or Cache Memory or Cache be as large as RAM Memory (4GB) so that everything can be in cache? Any good article/...
- 151
14
votes
8
answers
8k
views
how to keep c++ variables in RAM securely?
I'm working on a C++ application which is keeping some user secret keys in the RAM. This secret keys are highly sensitive & I must minimize risk of any kind of attack against them.
I'm using a ...
- 4,872