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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Control Linux kernel multi cpu usage at boot

I am developing a mobile system, that has certain limits in power consumption. The system has for example 4 or 8 cpu cores. If running, the total power budget is usually low due to idling of most of ...
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why is a laptop with dual core processor with 2.4GHz more practical than a single core 4.8GHz processor?

Hi I am looking to get a laptop but I have been reading that dual core processor with 2.4GHz is better than a single core 4.8GHz processor. Could someone explain exactly as to why that is?
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1answer
33 views

Hyper-Threading (SMT) Affinity and Equality

This question goes out to the Intel gurus that I know are out there. Are both threads on a physical CPU treated equally? As we know, hyper threading on intel CPUs is a system in which each physical ...
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1answer
35 views

CPU usage by Adobe Dreamweaver on a HP probook G1 450 - i5 Quad Core

Is CPU usage of 40% - 50% normal when running Adobe Dreamweaver CS6, or is there an underlying problem? My laptop is a HP ProBook G1 450, i5 Quad Core, and has 8GB RAM.
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65 views

How to disable some cores on Intel machine

I have a machine with two Intel(R) Xeon(R) CPU E5-2618L v3 processor, which has 8 cores on each socket. I only want the OS or hypervisor (such as Xen) on the machine to detect only one socket and ...
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1answer
46 views

Strange relation between processor cores usage and their temperature

I have a four core processor. When running office apps, all processor cores usage is about 1% and the temperature is about 32-38 degrees each. When running a specific game, core 1 works at 100% ...
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1answer
26 views

Is a single core process reassigned to some other core automatically when the core utilization is high in linux?

Generally, by default, if a single core process starts to have high core utilization, will it be reassigned to some other core which can handle and unless it is exclusively defined not to with in the ...
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3answers
334 views

Why multi core processors producing less heat

We are using multi core processors partially, because the waste heat of single core processors was to high to handle. (correct?) Now we are using multi core processors that create less heat and need ...
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2answers
208 views

ffmpeg encoding to VP9 results in Google Chrome-unplayable video, while to VP8 works

Plenty of time passed, since I have encountered the problem, specified in the subject. I tried multiple ffmpeg static builds, have built it from Git repository myself with different flags and on all ...
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2answers
139 views

Spread VirtualBox VMs over cores

I am using many VirtualBox VMs with different OS on one Ubuntu Linux host for development. Sometimes my scripts get wrong and starts loading 100% of VM cpu. And when one VM loads 100% cpu I cant even ...
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0answers
133 views

AMD FX-4350 randomly switched from 4 to 2 cores

I am using standard build Windows 10 Professional and out of nowhere, I restarted my computer and task manager is only recognizing 2 of the 4 cores. I have checked my BIOS and it is recognizing all 4 ...
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1answer
732 views

Can't seem to use 2CPU on Oracle VM VirtualBox 5.0.2

I have an IntelĀ® CeleronĀ® Processor N2815. I've confirmed Virtualization and VT-x are enabled. I can't choose more than one CPU when configuring a Linux machine on VirtualBox; the scroller is grayed ...
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2answers
174 views

How do I decide between CPUs with different clock speeds, number of cores and L3 cache sizes?

I am a web designer and I'm considering purchasing a Mac Pro (one of the new cylindrical ones). I've scoured the internet for information on the different processor options that they offer, but I'm ...
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1answer
279 views

How can I output y-cruncher Pi calculations to a .txt file?

I have y-cruncher running on my desktop. Unfortunately, I cannot figure out how to write the calculated pi to a specific number of digits onto a .txt file. The program write an output text file with ...
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1answer
101 views

Does the guest OS need updates/changes after changing the number of cores in VMware Player?

I installed ubuntu on a vm in VMware Player and forgot to change the number of cores from 1 to 8. If I change that now will the linux kernel need to be recompiled or anything like that or will it just ...
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1answer
42 views

On which processor(s) do my simulations run?

I am currently running 11 numerical simulations (coded in C) on another Mac computer via my Terminal using ssh and screen (Bash) on Mac OS. The computer that is running the 11 processes has 16 ...
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2answers
371 views

Running Windows processes in separate cores

I have an AMD FX-6200 (3.8GHz, six cores) and I would like to optimize it in this way: Core 1: Used only by key Windows processes, e.g. explorer.exe, svchost.exe, rundll32.exe, etc. Core 2: Used ...
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39 views

Virtual Domain Cpu Time limit

I'm running Munin on Ubuntu 14.04 to monitor my virtual machines (running KVM, libvirt). I often get a notification that CPU usage on my base system is 'critical': mydomain :: Virtual Domain Cpu Time ...
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250 views

setting affinity for multiple cores on dual cpu system

We are using some systems with 2cpu's with 6 cores/12 threads each so 24 threads in total, for quite a lot of multitread simulations. Because the problem doesnt scale perfectly, i usualy run 4 ...
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2answers
1k views

How to compress or hide the processors at top of htop on large machines?

I like to use htop to show me how the server is being used. Unfortunately with modern servers, the machine might have 48 or even 120 cores. This means that I can only see the first few lines of htop ...
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0answers
149 views

Linux command-line utils with built-in support of multithreading

I would like to be able to compare performance of multicore computers from a point of view of a user who performs typical day-to-day tasks in Linux. My current goal is to collect a list of compute ...
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1answer
961 views

Unlocking the 6th core of Phenom II X4 960T

I have a AMD Phenom II X4 960T processor on an Asus M4A78LT-M-LE (BIOS 0803) motherboard. CPU-Z screenshot: I am trying to unlock all the 6 cores of this CPU by enabling advanced clock calibration ...
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1answer
2k views

One cpu core working harder than the rest

I have seen that with my AMD A8 cpu one of the cores is working harder than the rest. See below: The running processes: Does any one know if this is a problem or just a natural assurance.
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2answers
109 views

Why a demanding proccess doesn't use another core?

I've got an older Core i5 laptop and I play Dota 2 game sometimes. It's pretty demanding for my processor. But when I quit the game and look in system resources graph (in Taks Manager) and see ...
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584 views

Ubuntu shows only one core out of four with nolapic booting option

I have a problem similar to one in http://ubuntuforums.org/showthread.php?t=1084622 http://ubuntuforums.org/showthread.php?t=1740798 http://ubuntuforums.org/showthread.php?t=1631926 i.e. my ubuntu ...
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458 views

Comparing an i7 (3.2Ghz) against an i5 (2.5Ghz) using linpack shows the i7 being worse

I am trying to compare the number crunching performance of an i5-3210M @ 2.5GHz with 6GB ram and an i7 970 @3.2GHz with 24GB ram. The results are so unexpected I presume I am either doing something ...
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28 views

Is parallelism in computer science always directly tied to the number of processor cores?

Specific to the Java programming language, would it be accurate to say that two threads can be concurrent, but can only truly be run in parallel if there are two or more cores?
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3answers
4k views

Why is my laptop both dual core and quad core at the same time [duplicate]

I bought an Alienwaremx14 with the following specifications , it is clearly stated here that my CPU is dual core However when i open Window task manager , I was shocked to find out I had four CPU ...
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1answer
40 views

How does multi-core architecture work with regard to parellelism?

I think I am correct in saying that scheduling is the/a main principle of the single core CPU, where the CPU is interrupted when switching from processing one set of instructions belonging to one ...
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1answer
75 views

Will I see an increase in performance if I use Windows 7 Professional over Home Premium? Regarding multiple physical cores

I have 2 physical cores and Home Premium specs say it only recognizes one but Pro recognizes multiple. If I swap out my Home Premium with Pro will I see an increase in performance? I have an Intel i5 ...
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1answer
2k views

Going from dual-core to quad-core to speed up multi-tabbed browsing in Chrome [closed]

I've got an Athlon II 240 and often times when I suddenly open 5-10 new tabs in Chrome, both my CPU cores go to 100% and all my previously opened tabs freeze for some 10-20 seconds until the new pages ...
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4answers
2k views

Why are the number of cores in a processor normally even

Whenever i look at specifications of the processor , the number of cores is always 2 , 4 ,8 . Is there any reasons why the number of cores are always even and not odd like 3 , 5 , 7
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4answers
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How to find out the total number of virtual core your CPU has

This is the specification of my computer however i have problem finding out how many virtual cores are there in total . I would like to know if there is any command in windows 7 which would help me ...
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1answer
353 views

How is CPU time measured on Windows?

I am currently creating a program which identifies processes which are hung/out-of-control, and using an entire CPU core. The program then terminates them, so the CPU usage can be kept under control. ...
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2answers
4k views

How can I tweak Windows 7 or 8 to Utilize Multi Core Processors?

Nowadays, desktop and workstations are getting more powerful as they have multi-core processors. For the versions of Windows that support multi-core processors, do these versions actually utilize ...
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3answers
6k views

Is having more CPU cores a better thing for running a web server?

I was reading about how User threads are mapped to kernel threads on Wikipedia. From this article I understand that FreeBSD uses the 1:1 (Kernel-level threading). So each User thread created by the ...
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57 views

Do TWAIN drivers benefit from multi-core CPUs?

Advanced TWAIN drivers of document scanners contain many image enhancement features such as descreen, color drop-out, despeckle, deskew, prevent see-through, etc. Some of these features are quite CPU ...
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2answers
119 views

Which physical core does the operating system use? [closed]

The operating system needs to be running on one or more physical cores of a multi-core processor, right? Is it possible to identify which those physical cores are using a piece of code?
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1answer
200 views

old and proprietary java application crashes on multiple cores

I have to use StarTeam 2005 CrossPlatform Client on a recent debian system inside of a VM. This works fine, if the VM is configured to single-core. But if I configure multiple processors and/or ...
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171 views

Disable 2 cores to meet 95w TDP

I have a Phenom II X4 965 BE CPU on a M5A78L-M LX/BR motherboard. The motherboard supports processors of maximum 95W TDP. The CPU is 125W TDP. So I disabled 2 cores of the CPU trying to avoid the ...
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1answer
639 views

How to interpret this /proc/cpuinfo data?

I'm using Intel Xeon E5-2620 processor. These are something I'm confusing 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 ...
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1answer
2k views

Does a HyperThreaded Quad Core Processor Actually Have 8 “Cores” [duplicate]

I have an Early 2011 Quad Core i7 Mac. Due to hyperthreading, a lot of programs report 8 "cores". If I were to write a program that executes in parallel, could I kick off 8 instances of this program ...
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1answer
61 views

Choosing which core to use when running a program

I work on a Fedora server running on an Intel Xeon with 15 cores. Some users are running simulations that take up four of the cores, but others seem to be unused. Is there a way I can have a program ...
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120 views

Limit Windows 8 “Automatic Maintenance” to single CPU core?

Windows 8's Automatic Maintenance has the nasty trait of hijacking my machine when I leave it idle. It becomes completely unresponsive after a while. In lieu of a proper solution by Microsoft, I ...
2
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1answer
459 views

ffmpeg not using all cores

I just got my new server with two intel e5-2695 but I was shocked to see that ffmpeg or ubuntu doesn't utilize all cores. top while ffmpeg was running top - 23:35:25 up 2:41, 2 users, load ...
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4answers
1k views

Optimum number of threads while multitasking

I know similar questions have been asked but I think my case is a little bit diffrent. Let's say I have a computer with 8 cores and infinite memory with a Linux OS. I have a calculation software ...
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1answer
238 views

Use all processor cores, 1 core/per 1 thread in *nix

According to xz documentation the "-T 4" means I should be using 4 threads, each compressing a different part of the file simultaneously. Before using nice -19 I would only get %50 usage of 1 core, ...
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1answer
81 views

How to know on which socket is a processor core?

I have a dual socket 8 core system, 4 cores on one socket and the other 4 cores on the other socket. How can I find, which core is on which socket through /proc/cpuinfo. For example here, on which ...
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2answers
978 views

Multiple cores = better multitasking?

Specifically I am looking at either the i5-3570k or the FX-8350, but it made me think of a more general specific question on how multiple cores can improve general multitasking. Been reading a lot of ...
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288 views

memcached issue on multi-core windows server with virtualization

i am having an issue running memcached (v1.4.4) on multiple cores. Here's my environment: Windows Server 2008 R2 SP1 running VMware, Intel Processor, only one core (out of eight) is enabled for the ...