All Questions
Tagged with cpu multithreading
17
questions
33
votes
7
answers
8k
views
Why do modern operating systems *ever* have perceptible input (keyboard/mouse) lag?
Sometimes computers stutter a bit when they're working hard, to the point where the mouse location freezes for a fraction of a second, or stutters intermittently for a few seconds. This sometimes ...
- 449
-2
votes
1
answer
175
views
What is the benefit of equipping a computer or smartphone with multiple CPU cores that differ in clock speed? [closed]
I've bought a samsung galaxy s21 ultra about a year ago. Today i was looking at the specs again and i noticed that the Samsung Exynos 2100 processor consists out of 1 single CPU core of 2.9 GHz, three ...
- 133
-1
votes
2
answers
1k
views
What happens when one thread is waiting to be executed while another is waiting for input?
Suppose I have two threads, A and B. A is waiting for input, while B is waiting to be executed. All other CPU cores are busy with CPU-bound tasks.
What will happen to A?
- 2,063
62
votes
10
answers
25k
views
Does it ever make sense to use more concurrent processes than processor cores?
I've got some process in Go. Here's an example counting lines in text, though the question is meant to be far more general than this particular example:
func lineCount(s string) int {
count := 0
...
- 1,169
8
votes
9
answers
8k
views
Why is multithreading not used everywhere?
Not almost, but all modern CPUs have multiple cores, yet multithreading isn't really that common. Why to have these cores then? To execute several sequential programs at the same time? Well, when ...
- 225
-2
votes
1
answer
701
views
Does accessing RAM from 2 threads double access time (synchronous access)?
As in topic.
If i want to access RAM from 2 different threads, completly different cells in memory, do they queue and are sent asynchronously or queue?
Lets say accessing memory from one thread (...
0
votes
1
answer
2k
views
Feature of CPU needed to run Javascript fast
This is more of a Computer Engineering question, but what is the feature of a CPU to run Javascript fast? I use to access the internet with an AMD Phenom II with 6 cores and I could almost have as ...
- 169
73
votes
3
answers
65k
views
How does a single thread run on multiple cores?
I am trying to understand, at a high-level, how single threads run across multiple cores. Below is my best understanding. I do not believe it is correct though.
Based on my reading of Hyper-threading,...
- 1,550
9
votes
2
answers
9k
views
Separate Thread Pools for I/O and CPU Tasks
I've been puzzling over a good implementation for this for a while. I have a program that does a long-running I/O operation (downloading a file) and a long-running CPU operation (parsing its contents)...
- 219
-6
votes
2
answers
2k
views
How does the web application support 150 max threads when the cpu only supports 2? [duplicate]
doing an lscpu cmd this is what i get
$ lscpu
Architecture: x86_64
CPU op-mode(s): 32-bit, 64-bit
Byte Order: Little Endian
CPU(s): 2
On-line CPU(s) list: ...
- 1
29
votes
2
answers
11k
views
How does sleeping a thread work?
When you sleep a thread, what is actually going on?
I see that sleeping a thread "pauses the current thread for a given period of time". But just how does it work?
According to How Thread.sleep() ...
- 3,478
-2
votes
3
answers
961
views
Is it possible and faster to run an application on an unused CPU core?
Is it possible to move an application (or task) to another core to make it run faster and get all of that cores processing power?
The way I understand it is that in an operating system applications ...
- 1,219
0
votes
0
answers
87
views
Cost of cache coherency/sharing data across multiple cores?
If I have two CPU cores, one is writing a particular cache line and the other core wishes to
Read
Write
the same cache line, what are the costs (in cycles) for doing so?
I am a little unsure ...
- 1,469
55
votes
12
answers
10k
views
Why would a program require a specific minimum number of CPU cores?
Is it possible to write code (or complete software, rather than a piece of code) that won't work properly when run on a CPU that has less than N number of cores? Without checking it explicitly and ...
- 1,139
43
votes
10
answers
28k
views
Why should your code not use 100% CPU? [closed]
I'm speaking specifically about a C# .NET 4 program running on Windows XP or higher, but general answers are also acceptable.
Assume an already optimized and efficient program. The problem here is ...
- 1,204