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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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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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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53 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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86 views

How to force Grunt tasks to use more CPU cores

I am currently running Ubuntu 12.04.4 LTS and using Grunt along with various contrib packages for my build toolset. Among other things, I am using grunt-contrib-watch to automatically detect file ...
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148 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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63 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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234 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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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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22 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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3k 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
23 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
53 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
213 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
393 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
1k views

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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0answers
55 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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43 views

Does OpenMp supports Real Time Task Computing?

OpenMP API provides a portable environment for modeling shared memory parallel applications in multi-Core platform. Since it works on the top of kernel level threads, my concern is can we use OpenMp ...
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2answers
857 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
1k 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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45 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
88 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
98 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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60 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
288 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
601 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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51 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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83 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 ...
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1answer
218 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
470 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
140 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
68 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
483 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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150 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 ...
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1answer
46 views

Is it possible for Windows not to detect input?

Say you had a decent spec'd computer (running Windows) with a dual core processor but you where pushing it to the limit a bit. Would it be possible for Windows not to detect any input at all for a ...
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2answers
3k views

How much the CPU clock speed matters over number of cores? [duplicate]

I was comparing various desktop/server processors on Intel's website and found that Xenon Coprocessor family constitutes 61 cores. (firstly, this name lead me to think as if this would be a secondary ...
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1answer
63 views

Specing out CPUs (more than just cores and clock)

This is not a production question, just something that I've been thinking about. When specing out CPUs I know the general rule is a faster clock speed will make a core run faster and the greater ...
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2answers
498 views

Does running a dual-core processor with one core disabled reduce power consumption?

I have a Core 2 Duo laptop, and I want to extend my battery life as long as possible. If one was to use an uniprocessor kernel, the second core should not be 'booted' for use by the OS (for lack of ...
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42 views

Running one OS per core

I'm interested in using a COTS board like the Wandboard for a project. On one hand I'd like to use something like Ubuntu for user interaction, sounds, TCP/IP stuff, etc. But I also need an RTOS like ...
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2answers
146 views

Are all Socket F Opteron processors interchangeable (within TDP limits)? [closed]

I have an old HP ProLiant DL145 G3 server I'm now using mostly as a budget 3D rendering node. Right now it has two Opteron 2218 processors (each is dual core). I'm looking at picking up a couple ...
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2answers
138 views

What should I be looking at in order to speed up a program that needs a lot of processor power and cores?

I want to build a system in order to run one particular specialised program as fast as possible (currently it can take up to 50 hours to do a run on my laptop with an I5-processor). The program is ...
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1answer
935 views

Can Windows 7 run on a 4 processor workstation?

I am looking to buy a new workstation to run a custom app that is heavily cpu intensive. Right now it runs on a Windows 7 (64bit) dual processor (intel 5690) workstation with 192 gb of ram. So, the ...
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3answers
217 views

Multithreaded Video Converter for Mac

Is there an app for Mac that can distribute a single video encoding job to several thread to utilize the full potential of the system? I used an application called iFlicks to do video encoding, and ...
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1answer
265 views

Does Cygwin support multithreading when starting multiple backgrounded commands?

Let's say I have a bash script like the following: prog list1.txt & prog list2.txt & prog list3.txt & wait will the "prog" instances be launched in a multithreaded environment (like, 1 ...
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1answer
2k views

How are GHz in multicore processors computed? [duplicate]

Possible Duplicate: How fast is each core in a dual-core processor? I am debating between two systems (for simplicity): (1) 2.9 GHz dual core processor (2) 2.3 GHz quad core processor ...
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3answers
3k views

Why does VirtualBox show more CPUs than available?

I have an Intel Core i7 3930K with 6 CPU cores. Now, I understand that every of that cores can handle 2 separate threads. That makes 12 virtual cores - which I can see using my system monitor (see ...
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2answers
7k views

How many instances of FFmpeg commands can I run in parallel?

I tired running 8 commands in parallel to fully utilize the CPU and speed up Video conversions, something like this: ffmpeg -i input.mp4 -t 60 -f mp4 /mnt/a.mp4 > /dev/null 2>&1 & ...
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4answers
2k views

How do multi-core CPUs work?

I know, vague question title, but my main question is, does 1 core have to execute only one program at a time? Does the "multitasking" at the CPU level work by switching between tasks, and if so, why? ...
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229 views

Does the OS exploit multiple cores

I know that more cores isn't always better and that most applications are single threaded however does the OS make use of the additional cores? For example, assume an application such as a dictionary ...
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1answer
311 views

Is it faster to run one process that spawns N threads or to run N processes?

I need to run ~1500 jobs on my lab's server. The program I am using (blastpgp if anyone cares) is capable of running in parallel mode, the "-a" option sets how many threads it will launch. The server ...
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2answers
2k views

Can a single process be executed in two or more processors in a multiprocessor system?

I have heard that one processor can work on only one process at a time. Is this true? If so, then how can a single process be executed in more than one processors at a time? Is this even possible? ...