Questions tagged [multi-core]

A multi-core CPU is a kind of CPU that has two or more actual chips inside it (known as cores). This allows a computer to actually be processing multiple things at once and is often seen as the solution to continuing Moore's law.

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How to know limits of scheduling with multi-core PC?

Recently I've noticed that despite of very low system usage in terms of CPU and memory, the system has got considerably slow and less fluent over time. - I use Ubuntu 20 with 32GB RAM, 6-core CPU and ...
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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 "...
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Find process running in CPU core Win10

I have a multi-core Win10 machine. Some process consumes 100% CPU in a core, while overall CPU consumption remains low. I can identify the core - but not the process running in it. Need to figure out ...
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Multicore multiprocess performance issue on Linux ARM environment

I am developing a Linux application on 4-core ARM CPU. There are two processes in the application and I allocated each process to the cpu like below. core1 : process1 (GUI) core2-4 : precess2 (...
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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 ...
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Less overall heat? Dual-core vs Quad-core CPU running single-threaded Application

Setting: Multicore-CPU is running an application which is only using one thread. Assumption: In regards to clockspeed, 2-Core and 4-Core would need the same time to run and both would have the same ...
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1 big core or 4 small cores, which one is better of virtual private servers?

I am trying to find and buy a VPS service. I see some plans like one-3.5GHZ core, dual-2GHZ core, quad-1GHZ core, etc. I like to know which one is better and has more computational power? What I want ...
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How does cores/logical cores handle the threads [duplicate]

I have this whining question on my head, which stuck me for days. Correct me if I'm wrong: My aspect on computer architecture and organisation is that, In early day computers, there was a single ...
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What does it mean [Cores 4] [Logical/Core 2]?

I saw a Processor which states: Intel(R) Core(TM) i7-10510U CPU @ 1.80GHz[Cores 4] [Logical/Core 2] It means it has 4 cores or 2 cores and and logical? I am a bit confused about it.
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Are the Geekbench multicore scores done using embarrassingly parallel processes?

For each processor, the benchmarks at geekbench.com present both a single-core and multi-core score. For example, this 64-core processor has a single-core score of 1220 and a multi-core score of 23688....
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Can you run two operating systems on separate CPU cores without virtualization? [duplicate]

Let's imagine we have a quad-core CPU. Now, I'm wondering if it is possible to run – let's say – Windows on 2 of the cores and Linux on the other 2 cores. And – before someone marks this as a ...
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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 ...
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Do Multiple Subprocesses Utilize Multiple Cores?

I have a question and it's basically exploring some lazy ways to utilize all the cores on a machine. Say I have program "./theprogram" which acts on a data set D, is "embarrassingly parallel", and ...
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MKL performance lost when running many independent instances

I'd like to take advantage of 40 physical cores in my 2 * Xeon gold 6230 system with 64GB (2 * 32GB) memory installed. Operating system is Ubuntu 18.04. The task is solving eigenvalues of random ...
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Can one core perform several operations/instructions during one tick (because core has different execution units)?

A core has its own execution units and load/store buffers (additional "cache" - in addition to L1). Do those execution units have their own registers? Do cores also have their own dedicated registers?...
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Intel X vs Intel K CPU gaming [closed]

I'm looking to build a PC, and want eight RAM slots. For eight RAM slots, I need to choose motherboards with X-series chipsets, which requires an X-series CPU. Intel example of K-series CPU: Core i7-...
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Do multi-core processors have internal hardware for randomly changing in which core the instructions are executed?

A friend of mine says that a process always jumps between cores even if you pin a process to a specific core within operating system. He says that the processor manufacturers do this so that the ...
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Has CPU inter-core communication become slower?

I'd be pretty amazed if it had but maybe somebody can help me understand. I ran SiSoft Sandra Lite 2014's 'Processor Multi-Core Efficiency' test (which returns an 'Inter-Core Bandwidth' value) on my ...
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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 ...
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launching multiple instances and performances

I am making some benchmark tests and I use "truebench". This is a simple C program which just do a memset and a memcpy several times. On my laptop, when I launch only one instance I obtain 62s but ...
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How to utilize all cores on high-end CPUs using ffmpeg

I have a high-end HPE ProLiant DL325 G10 server with an AMD EPYC 7401P 24-core/48-thread CPU, 128GB DDR4 RAM, and a Intel P4800x PCIe NVMe. I tried to run ffmpeg to convert a video (MKV) to MP4 for ...
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How many threads can I run in my program?

I have a python program that uses the threading module and runs multithreads that executes a function. The number 8 below is the number of threads in the program but I need to know what is the number ...
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VirtualBox in VirtualBox CPU core usage

Background: I am attempting to run a VirtualBox VM within a VirtualBox VM. The first host machine is running atop an Intel 4670k, with Intel Virtualization Technology enabled, with 4 total cores ...
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Is there a significant issue to allocating all available cores to one VM if that is the only major task running?

I have a one-off task that requires me to use a VM to fix a build bug a software project using SCons (Python). The testing cycle is fairly short, resulting in frequent rebuilds. I'm using a 4-core ...
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Is it possible to merge CPU cores?

Back in the past there was something called hyperthreading where a single CPU core acted like two cores. But is it possible to merge two CPU cores to an single one to improve performance on programs ...
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Can Windows make use of 16+ core processors? [closed]

There's currently a number of processors on the market with 12, 14, 16, 16 32 cores (AMD Threadripper, Intel i9) and so on. Can Windows 10 even make use of this power? We know that it can support up ...
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Real cores or threads in an i5 7500T?

They say an i5 7500T has 4 cores (so, in this case 4 threads). When I, for instance, calculate the 1 millionth Fibonacci number (single thread only, every number is dependent on its predecessor) using ...
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Find core used from CPU utilization?

I have average and peak CPU utilization(in percentage) of a linux server with me . Mainly couple of web apps are deployed on the machine. I need to decide what AWS machine suits me based on that. AWS ...
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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) ...
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On a multi-core Windows PC, why does a single process only occasionally use all cores?

For years, I had the impression that a single process can only use at most one core of the CPU, but recently I found two examples where a single process used all the cores of a multi-core Windows ...
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Force process and kernel module to one core exclusively [duplicate]

I'm just in the phase of evaluating new possibilities, so this question may be a bit strange. I have a Quad-Core CPU which has to do some realtime tasks (it has access to some GPIOs, so this is ...
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735 views

Can I have Windows OS dedicate one or 2 cores to a specific prog./application?

I can often times find benchmarks that compare performance on certain tasks such as for gaming ( Frames per second). However, I have long wanted to use my multiple cores to quickly switch between apps ...
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How multithreading works on multicore cpu in linux..? [closed]

In one interview I got one question, If I have dual core cpu,can I run one thread on both CPU at a time? If possible how it is works.?
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How many CPU cores can Firefox Quantum utilize?

I have a webapp that is very CPU intensive (multiple nested loops running over large dataset). I could run it in one Firefox tab or distribute the load across multiple tabs (if that's better). I was ...
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Homogeneous cores and heterogeneous cores

I am currently reading up on multi-core architecture for CPUs. However, I am having difficulties understand the meaning of "using one core design repeated consistently" which describes homogeneous ...
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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 ...
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371 views

Can Intel CPUs change clock speed on a per-core basis?

Many multi-core Intel CPUs feature both SpeedStep and Turbo Boost, and can therefore run at clock speeds both below and above their base frequency. Can these CPUs control the clock speed per-core, or ...
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864 views

Parallel: Limited number of multi-threaded processes

I'm using GNU parallel to run multiple jobs in parallel like this: parallel python3 main.py arg ::: args*. With single-threaded jobs, I used -j 100% to ensure that 1 job is mapped to 1 core. Now, ...
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Why do we have CPUs with all the cores at the same speeds and not combinations of different speeds?

In general if you are buying a new computer you would determine which processor to buy by what your expected workload will be. Performance in games tends to be determined by single core speed, whereas ...
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Is it possible to simulate a singlecore CPU in a multicore CPU?

I have a multicore CPU with Windows 10 and I would like to test a Software running as if my PC was a singlecore CPU. Is there any way to limit Windows 10 installed in a multicore CPU (Quad Core) to ...
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559 views

How do you control thread affinity across multiple processes on Linux?

Question How do I run two benchmarks such that: They are both executing concurrently Both benchmarks have half their threads on each socket. No two threads share the same core. Background I have two ...
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Why does everything I do seem to use all my CPU cores?

I have an Intel i5 4300m. When I open the Windows Resource Monitor, it shows 4 cores. When I perform operations such as using the browser or running a simple Python script, the % usage of all 4 cores ...
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Does 'make' take advantage of multiple cores/threads? (linux)

We are considering a new workstation (will be running Fedora 25/26), and would like to know what a good CPU would be. To start off, I need to know how many cores I need. To help decide that, I want to ...
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Threads (versus cores) and rated CPU clock speed, what is the effect?

If my CPU is rated at 2GHz, and has 4 cores supporting 8 threads, are all 8 threads running at the rated clock speed? Or are they running at 1GHz each since there are twice as many threads as cores?
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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 ...
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367 views

ffmpeg performance with multiple core cpu and windows [duplicate]

I call ffmpeg command to generate mp4 using input of mp3 and folder of images my problem is running 3 instance of ffmpeg cause 8 GB 6 core to be full with 100% cpu this is the command I use , any ...
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Terminology for cores in a multicore processor [duplicate]

What is the difference between logical and physical cores in a multicore processor? And is execution core another name for a physical core?
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278 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 ...
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How can I change the distribution of Cores across NUMA-nodes?

On Ubuntu 14.04 TLS for 36 total cores = (2 x CPUs x 9 Cores x 2 HyperThreading), lscpu give me: Architecture: x86_64 CPU op-mode(s): 32-bit, 64-bit Byte Order: Little ...
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279 views

What Control unit has the power in a multicore cpu?

A processor with cores is just a bunch of single cpus thrown together on a single IC (Integrated circuit)(That's why my /proc/cpuinfo shows 4 of them). A CPU is made up of some sub-units always ...

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