Questions tagged [hyper-threading]
A technology by Intel to increase processor throughput, by adding independent logical processing units in each core (and thus exposing two times the number of cores to the operating system).
94
questions
0
votes
1
answer
3k
views
How does vCPU topology (sockets / cores / threads) affect computing performance of a VM?
I have an Ubuntu host with an AMD Matisse processor (12C 24T). When launching virtual machines using libvirt (QEMU+KVM), there's the option to set CPU topology.
Almost all consumer PCs have single-...
CommunityBot
- 1
0
votes
1
answer
141
views
Why one logical core in my processor is idle
I have an Intel Core i7 4790 processor which has 4 cores 8 threads.
When I run games or programs, only 7 of the logical cores are activated and one stays at zero or 2-3% usage.
What is happening here? ...
- 1,519
5
votes
2
answers
7k
views
Is there a significant performance difference between virtual and real cores? [duplicate]
Possible Duplicate:
Hyper-Threading and Dual-Core, What's the Difference?
Most Intel processors feature what they call "hyperthreading," basically another virtual core for each physical core.
...
- 23.9k
0
votes
1
answer
57
views
Understanding count of logical processing units in Qualcomm SOC
I have Qualcomm RB5 board.
Its SOC spec sheet says following:
CPU: Kryo 585 CPU, 64-bit, up to 2.84 GHz
ISP: Qualcomm Spectra 480 ISP with Dual 14-bit image signal processing
GPU Adreno 650 GPU w/ ...
- 2,900
61
votes
6
answers
57k
views
What is hyper-threading and how does it work?
I've heard the term hyper-threading thrown around a bit recently, what exactly is hyper-threading and why is it important?
16
votes
3
answers
18k
views
cpu load measure with hyperthreading on linux
How can I get the true usage of a multicore hyperthreading enabled cpu?
For example lets consider a 2 core CPU, expressing 4 virtual cores.
A single threaded workload would now show up as 100% in ...
CommunityBot
- 1
21
votes
3
answers
29k
views
Task Manager is saying the system is running with over a thousand threads
I opened up Task Manager and looked under the "System" area and saw:
Threads: 1337
Since I have a dual-core processor with hyper-threading available (meaning four threads), how is it possible to ...
CommunityBot
- 1
48
votes
3
answers
35k
views
What is the difference between hyper-threading and multiple cores?
In a conversation with the network administator, I mentioned that my machine was a dual-core. He told me it was not. I brought up the task manager, went to the perfomance tab, and showed him that ...
9
votes
1
answer
9k
views
How do I identify which cores are which on an Intel hybrid CPU?
I have an Intel hybrid CPU (Alder Lake). This means it has some number of P-cores, and some number of E-cores. Additionally, the P-cores are hyper-threaded.
Task Manager, and other performance and ...
- 7,405
3
votes
2
answers
2k
views
How to enable hyper-threading and turbo-boost for this processor?
I bought EliteBook 8740w laptop yesterday. Hyper-threading is not working on windows although I enabled it from BIOS. I have windows 10. Also, when I stress the CPU using CPU-Z program, it doesn't go ...
7
votes
3
answers
13k
views
Physical vs logical vs virtual cores
My processor has 4 physical cores.
Maximum of 8 virtual cores per core. Does the following applies:
if hyper threading is enabled than 4x 2 = 8 logical cores. Which means 8 x 8 = 64 maximum virtual ...
- 153
-2
votes
3
answers
343
views
Can this Intel processor multi-process 4 or 8 threads?
I am helping a friend who is trying to run multiple threads on a system with an Intel Core i3-3217U processor.
According to Intel's website, that processor has 2 cores which support 4 threads per core(...
- 129k
0
votes
1
answer
4k
views
How many physical CPU Cores does Windows support? (Asked in 2021)
How many physical CPU Cores does Windows (amd64, not arm) support?
So with "physical CPU Cores" i mean that a CPU with 4 Cores and Hyperthreading counts as 4 and not 8 Cores. Also with "...
- 157k
1
vote
2
answers
824
views
Can 50% CPU usage indicate bottlenecking on a hyperthreaded CPU?
I'm trying to increase my FPS in a videogame and as such I'm trying to find the bottleneck in my system. Nothing seems to run at 100%, even when the FPS limit is much higher than the actual FPS (I'm ...
- 36
1
vote
0
answers
142
views
Setting different frequency policies for sibling cores with SMT
On a processor that supports simultaneous multithreading, of which I no longer have any for testing, what would happen if only one or some of a physical core's logical core has a frequency policy ...
- 407
3
votes
0
answers
65
views
How to assign physical cores to a single process on Fedora?
I m having a Python script where the overhead of parallelization per added threads is above the maximal performance benefit of hyperthreading.
But setting the number of threads at half the number of ...
- 1,843
1
vote
1
answer
3k
views
Is my VM hyperthreaded?
I've been provided a VMware ESXi VM (running Windows Server 2016 SE) with 8 logical processors, but I can't tell whether the VM is hyperthreaded. (This matters for SQL Server.)
C:\Users\XXXXXXX>...
- 495
0
votes
1
answer
439
views
How is hyper threading more efficient? [duplicate]
I read a lot about Hyper threading and how it works. One thing I still can't 'digest' is how is it more efficient than not using hyper threading at all?
Hyper-Threading is where two threads are able ...
- 65.2k
0
votes
1
answer
502
views
i7 7700 processor showing only 4 cores and No of threads per core is 1
I am a ubuntu user, when I type lscpu I got it as
Architecture: x86_64
CPU op-mode(s): 32-bit, 64-bit
Byte Order: Little Endian
CPU(s): 4
On-line CPU(s) list: 0-3
...
- 131
0
votes
2
answers
203
views
What is the optimal number of CPU-heavy data mining jobs to run in parallel? [closed]
I have a CPU heavy data mining job that's parallelizable. Each job run takes ~10 minutes. The job isn't heavy in IO, it's mostly heavy in CPU compute. I have a 32-core rig with 2 threads per core and ...
- 481k
1
vote
1
answer
240
views
Number of processors in a multi-core CPU with hyper-threading
I've been reading What Every Programmer Should Know About Memory by U. Drepper, where they state the following on p. 3:
Red Hat, as of 2007, expects that for
future products, the “standard ...
- 13
2
votes
2
answers
1k
views
Will Idle temperature increase when upgrading i5-8400 to i7-8700?
I have a passively cooled i5-8400 which runs at about 34-40 degrees for most of the day (peaking at about 60 degrees periodically) using a Cooler Master Hyper heat sink and a single 20cm Noctura case ...
- 173
-2
votes
1
answer
1k
views
Disable hyperthreading on Vivobook 15
Updated: I've already done this thing before write this post.
Disable Hyperthreading in the Windows 7 registry
I'd searching many many threads about this problem, no answer, so I ask for further ...
- 155
1
vote
1
answer
342
views
Windows - Metatrader 4 (32bit) - Freezing issues! Hypertreading? SingleCore overloading?
Ive been breaking my head on this issue for a while and i realy need some guidance. I think i might have solved it but i want to understand what the issue is if i need to upgrade or expand my system.
...
- 9,623
8
votes
4
answers
25k
views
Performance-impact of Hyper-Threading
I just read an article on Heise Online (look at the table, the rest is German) which claimed, that Hyper-Threading slows down single-threaded programs although they don't use the second thread of a ...
- 1
1
vote
1
answer
3k
views
Does disabled hyperthreading double the performance on single thread?
I have processor with 4 cores (Intel Core I5-8250U @ 1.6 GHz)* and hyperthreading makes it 8 logical processors.
I use a program that does some heavy calculation* in a single thread. When I look up ...
4
votes
2
answers
32k
views
Why does Windows 10 have CPU core parking disabled?
Why does Windows 10 come with core parking disabled?
It seems to me, that core parking is good in most cases. Especially considering Turbo Boost does not work until some cores are parked.
Also why ...
CommunityBot
- 1
0
votes
1
answer
2k
views
Hyperthreading and how applications benefit from it
I have been interested in hyper threading and how can applications benefit from it. From what I have read, hyper threading is directly managed by the operating system and it is related to how virtual ...
- 9,468
0
votes
1
answer
2k
views
How to disable HT on Surface
Given a recent security advisory I would like to disable hyperthreading on my Surface Laptop. Presently I have two physical cores providing four logicals. I have read that if I use msconfig.exe boot ...
- 42.7k
0
votes
2
answers
13k
views
If i5 has no hyperthreading why it has more threads than cores
I have read at a lot of places that i5 does not have hyperthreading and that i7 is i5 + hyperthreading. If it is true, how come many i5 processors have more threads than cores(4 cores and 8 threads) ...
- 63.1k
9
votes
1
answer
5k
views
How does the Windows 10 scheduler deal with Hyper Threading since Core Parking is disabled by default for Intel CPUs?
I'm running Windows 10 (1607) on an Intel Xeon E3-1231v3 CPU (Haswell, 4 physical cores, 8 logical cores).
When I first had Windows 7 installed on this machine, I could observe that four out of eight ...
- 154
1
vote
2
answers
779
views
How many threads can I run when using an Intel Core Duo CPU to speed up bulk data download from Amazon S3 in a custom application?
How might I find out the maximum number of threads I can use? I'm new to programming, so I'm trying to figure out what I need to know. I have 950 GB of files to download from Amazon S3. I was thinking ...
- 190
5
votes
3
answers
28k
views
CPU monitoring: hyper threading, current clock speed
I think it'd be interesting if it were possible to check out at how much Ghz each one of my cores is running. Is it possible, at all?
- 7,405
14
votes
1
answer
16k
views
See if Mac OS X has enabled hyperthreading?
There is a way of disabling hyperthreading on Mac OS X: How to disable HyperThreading on Mac OS X Lion?
Is there a Terminal command of seeing whether Mac OS X has hyperthreading enabled?
- 481
1
vote
1
answer
723
views
CPU threads not being used
I recently got a new Thinkpad T570. I'm running Fedora 27. It has a i7-7600U processor that should have 2 cores and 4 thread according to Intel (https://ark.intel.com/products/97466/Intel-Core-i7-...
- 46.1k
12
votes
3
answers
6k
views
Why Hyper-Threading provides 2 virtual cores but not more?
Here is an explanation of Hyper-Threading found on Wikipedia:
For each processor core that is physically present, the operating system addresses two virtual (logical) cores and shares the workload ...
-5
votes
1
answer
568
views
Hyperthreading operating system
My question is does the operating system has any role in implementing hyperthreading.
Where is hyperthreading implemented in BIOS level or operating system?
Are there OS who does not support ...
- 61.9k
3
votes
0
answers
68
views
Can I tell how much multi-threading I'm using each day?
Is there a way to determine (or even better, to log) how much benefit I'm getting from my computer's multi-threading capabilities?
Background: My higher-ups are proposing to give me and my team new ...
1
vote
2
answers
875
views
Running Ubuntu in VirtualBox under Windows 8.1 doesn't use CPU on 100%
I am running Ubuntu 14.10 64 bit under Windows 8.1 64 bit using VirtualBox 4.3.10. I have an Intel Core i5-2410M CPU, with 2 physical cores and enabled HyperThreading and virtualization.
I have set ...
- 1,425
4
votes
1
answer
3k
views
Why are 16 threads more efficient than 8 on an i7 with hyperthreaded 4 cores? (Robocopy)
In Windows 8.1, I am using Robocopy to save 2 servers' data onto a dedicated PC's storage space. The data volume is 147,314 files in 4,110 folders (66,841,845,760 bytes).
All 3 involved PCs feature ...
- 703
0
votes
1
answer
87
views
If Affinity on Windows is set on 1 thread only, does it eliminate problems with thread-unsafe software?
Say I have a third party software executable I can't really edit or alter in anyway or debug properly. I suspect it has issues with multithreading in a way that it segfaults the application due to ...
- 63.1k
1
vote
0
answers
4k
views
Turning off Hyperthreading in Windows 10 in Gigabyte P57 Laptop
I don't see an option for hyperthreading or HT in my bios even though I know hyperthreading is enabled. How can I disable it? Here's the screenshots from all the BIOS tabs:
*What is the solution, if ...
- 745
1
vote
0
answers
120
views
How to log/get a report on threading performance in Windows?
So with programs like Process Explorer and Process Hacker you can see what the individual threads from a given process are up to. However as far as I can tell its just an active monitor with no way to ...
- 111
12
votes
4
answers
19k
views
Quad Core host with hyper-threading, how many processors to configure in VirtualBox?
I have a quad-core i7 processor with hyperthreading (8 logical cores), when I configured a virtual machine to use 8 processors, VirtualBox gave me a warning saying that I only have four cores (which ...
0
votes
0
answers
416
views
How much do IDEs take advantage of multiple CPU cores?
So, how much do IDEs, for instance Android Studio or Eclipse, take advantage of multiple threads and CPU cores? That is, how much faster do they run on, say, a quad-core CPU compared with a dual-core ...
- 21
1
vote
2
answers
2k
views
do I get half the CPU speed for a single thread if HT is turned on? [duplicate]
If I have a single 2.6GHz core for example would it mean that with hyperthreading I have only 1.3GHz for a single thread that my app have or is it on demand only if I will use (lets say my app is the ...
- 103
1
vote
1
answer
1k
views
How should I interpret this /proc/cpuinfo data?
I'm using Intel Xeon E5-2620 processor. There is something I'm confused about. I'm using Linux and in /proc/cpuinfo it says:
model name : Intel(R) Xeon(R) CPU E5-2620 0 @ 2.00GHz
According to the ...
- 18.8k
4
votes
2
answers
8k
views
Hyper Threading vs overclocking
What is the difference between these two, and under what circumstances would I want to implement them? Are there circumstances when I would only want 1 and not the other?
According to Wikipedia, ...
CommunityBot
- 1
1
vote
2
answers
2k
views
Running threads on a non hyper-threading Intel processor
Intel Pentium Processor E5700 (2M Cache, 3.00 GHz, 800 MHz FSB) does not have hyper-threading but it has has 2 cores so I am assuming it has 2 threads
Now if I write a heavy number crunching program ...
CommunityBot
- 1
0
votes
1
answer
2k
views
Virtualbox with i7-4790 one thread per virtual machine
I’m considering buying an Intel Core i7-4790, which has 4 cores and 8 threads.
With a 4 core, 8 thread CPU you should see 8 CPU available in the green slider area; see picture below. I set the slider ...
CommunityBot
- 1