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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).

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Why are cores 1 and 3 stuck in offline mode in Linux?

I have a system running with a CPU that has the following info from lscpu: CPU(s): 4 On-line CPU(s) list: 0,2 Off-line CPU(s) list: 1,3 Vendor ID: ...
shortspider's user avatar
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How to troubleshoot high "Avg CPU Load" issue?

Recently we have been facing a problem of High Avg CPU load on a centos VM monitored though Zabbix agent. The VM running MongoDB instance with 2 cores with no hyper-thereading. Zabbix captured avg ...
goodfella's user avatar
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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? ...
santosh vvns's user avatar
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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/ ...
RajS's user avatar
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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 ...
Bob's user avatar
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-2 votes
3 answers
454 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(...
End Antisemitic Hate's user avatar
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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 "...
Regda's user avatar
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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 ...
Lara's user avatar
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0 answers
160 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 ...
Mona the Monad's user avatar
3 votes
0 answers
72 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 ...
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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-...
iBug's user avatar
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1 answer
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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>...
RonJohn's user avatar
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1 answer
502 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 ...
Stefan Jankovic's user avatar
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 ...
user2824371's user avatar
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1 answer
533 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 ...
Adupa Vasista's user avatar
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2 answers
210 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 ...
JascksonCounty2's user avatar
1 vote
1 answer
295 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 ...
J. C.'s user avatar
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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 ...
Kram's user avatar
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-2 votes
1 answer
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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 ...
Suratraak's user avatar
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1 answer
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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. ...
Geo 's user avatar
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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 ...
Puzzled student's user avatar
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 ...
LOST's user avatar
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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 ...
Erik9631's user avatar
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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 ...
Gaius's user avatar
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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) ...
Vivek's user avatar
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1 vote
2 answers
837 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 ...
brienna's user avatar
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1 vote
1 answer
752 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-...
Jason Desrosiers's user avatar
-5 votes
1 answer
582 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 ...
Dheeraj Ramchandani's user avatar
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 ...
techturtle's user avatar
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7 votes
3 answers
15k 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 ...
user778561's user avatar
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 ...
A.L - say no to AI's user avatar
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 ...
Herb's user avatar
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0 votes
1 answer
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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 ...
j riv's user avatar
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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 ...
Mona Jalal's user avatar
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 ...
manuel's user avatar
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1 vote
0 answers
131 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 ...
user1086516's user avatar
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 ...
Bonita Montero's user avatar
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0 answers
424 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 ...
Marko J.'s user avatar
-5 votes
1 answer
1k views

do skylake core i5 CPUs support hyper-threading technology?

Do the skylake core i5 series of desktop CPUs support hyper-threading technology?
jellyfish man's user avatar
0 votes
2 answers
2k views

hyper threaded core i3 vs non-hyper threaded core i5

I have been searching around and comparing specifications to build a budget gaming PC. On the Intel site, i have been comparing CPUs and I noticed that the I3 CPUs, while only having 2 physical cores ...
MassiveFire's user avatar
0 votes
1 answer
963 views

CPU time count on HyperThreading systems on linux

I am trying to estimate the amount of work a multithreaded application takes. That is quite a simple task with real cpu/cores as I can just take the CPU time from proc and that will be an estimation ...
grandrew's user avatar
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0 answers
456 views

How to turn off hyperthreading on hp z230 Win7 32bit

I have a legacy application that when ported to this new HP desktop exhibits performance errors. I need to disable hyper-threading on this desktop. It has an Intel I5-4095 quad core processor. The ...
emp1953's user avatar
  • 11
1 vote
1 answer
2k views

Turn off HyperThreading without BIOS

I need to turn off HyperThreading from my i5-3210 notebook since it hinders my IDE performance. My i3 took about 10+ seconds from compile to run in my Android VM, same code runs in my AMD in about 10 ...
prd's user avatar
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-2 votes
1 answer
139 views

Doubts regarding multithreading and hyperthreading [closed]

Today I was trying to understand what multithreading and hyperthreading are. However I have several doubts regarding it. In multithreading, what happens when two threads try to modify the same ...
Raman's user avatar
  • 159
2 votes
2 answers
6k views

Why is it said that 'The longer the pipeline, higher the processor clock rate' [duplicate]

I have been recently going through the hyper threading technology of Pentium 4. The number of pipeline stages is high in P4 and is said that it will increase the speed of clock rate. How is that ...
Nithin Jose's user avatar
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 ...
david's user avatar
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5 votes
1 answer
2k views

Why does my non-hyperthreading enabled CPU claim it has hyperthreading?

I was checking my processor for the aesni (hardware aes, "aes" flag) when I discovered the "ht" flag. This, on i7 processors denotes the CPU's ability to do hyperthreading, however, since I own a i5-...
Azsgy's user avatar
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1 vote
2 answers
880 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 ...
hunyadym's user avatar
  • 119
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 ...
Jas's user avatar
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0 votes
1 answer
108 views

Cores and threads - Performance

I wonder if a 4 core/8 thread cpu will perform better than a 4 core/4 thread cpu. If the answer is yes; How much better will a 4/8 perform? EDIT: What if its for running 4 single threaded apps? And ...
user3524823's user avatar