Debian :: Wheezy Only Recognizes 1 Core Or Dual Core CPU?

Sep 7, 2011

I have now installed Wheezy on two different hard drives and in each case it seems only one CPU of my dual core CPU computer is recognized. System Monitor, Gkrellm and lscpu show just one when prior to the new install the old Wheezy showed both CPU's. I have put the hard drive into two other computers with dual core CPU's and all show just one CPU.

Interestingly System Profiler and Benchmark (hardinfo?) > Devices > Processors now show a large amount of processor infomation when with the old Wheezy I would only see both CPU's listed and nothing else.

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Ubuntu :: Run Dual Core - Crash - Single Core Runs Perfect

Apr 1, 2011

i am running gigabyte GA-M68M-S2P and AMD sempron 2.7. the problem is when i try to run dual core. it will boot and run for 2mins then it crashes. single core runs perfect.

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Fedora Installation :: Dual Core Only Showing Single Core On F14?

Nov 3, 2010

I just loaded F14 on an old Dell Dimension 3000 with a dual core processor but only one is showing. Here's the output from top:

processor: 0
vendor_id: GenuineIntel
cpu family: 15
model: 4


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Ubuntu Installation :: Dual Core Support Core 2 E8500 Out Of Box?

Feb 14, 2010

Just a quick question. Does Kubuntu Karmic support core 2 E8500 out of the box or do you need the SMP kernel?

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Ubuntu :: Lucid Lynx - Dual Core - One Core Always At 100%

May 15, 2010

I've a Compaq CQ61 laptop, and i noticed that one of the cores is always at 100%.

I didn't check the duration of the battery but surely it will "eat" my battery in a hurry

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General :: Only One Core Of Dual Core Processor Are Working

Mar 14, 2011

I recently read in a forum that by default the Linux kernel only activates one of two cores in a dual core processor. Searching online gave one option to find out and that was the mpstat command. I therefore ran the command and got the following output.As the result says, it shows only 1 cpu. I was wondering what I could do to activate both cores in my machine, and whether doing so was going to cause me any problems.

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Debian Multimedia :: Wheezy Warning: Keep Xserver-xorg-core 2:1.10.2-1?

Jun 19, 2011

I experienced this problem on Friday but didn't have time to write a warning.A couple of days ago, xserver-xorg-core 2:1.10.2-1+b1 reached Testing before a corresponding dependency (recommendation), thus breaking the hardware acceleration. The issue is (better) described here (1) by a developer.A possible solution is to keep (2) the previous version (2:1.10.2-1) or, if you already installed the faulty one, to grab the former version from Debian Snapshots (3) and downgrade the package.Because the error was a simple path change, one could also keep the new version of xserver-xorg-core and link the DRI Mesa modules to the directories that are inspected now (as described here [4]).The issue has already been addressed (5) and a new version should appear in Testing shortly.[URL]

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Ubuntu :: 10.04 Recognizes Two CPUs And Two Cores On Four Core CPU

Jun 23, 2010

I'm using Ubuntu 10.04 x64, and I have an AMD Phenom 2 x4 940 CPU. First I have to underline that four cores worked perfectly in previous versions of Ubuntu as well as Windows.

When looking at system monitor it tells me that I have two CPUs/Cores, it should be four.

This is the output of CPU info:

processor: 0
vendor_id: AuthenticAMD
cpu family: 16
model: 4


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Debian :: Architecture For Intel Pentium D Dual Core?

Mar 8, 2010

I'm a Linux Mint user, but I'd like to cross over to Debian. I used the x86 architecture for the Mint install, but I couldn't find that anywhere on the Debian site. what the architecture for the Intel Pentium D dual core is?

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Debian Hardware :: CPU Frequency Scaling - On Dual Core Intel ?

Nov 3, 2010

I'm having a weird problem (2.6.32-2-686-bigmem , sid):

Frequency scaling works on CPU 1 but not on CPU 0.

This is regardless of application, the Gnome applet and cpufreq-selector both fail

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OpenSUSE :: Get Application To Utilize More Than One Core In Multi-core Setup?

Mar 27, 2011

I have a command line OCR program called OCR Shop XTR (Vividata corp) that I am using on a system with a 6-core AMD chip. I changed the bios so that the 6-cores were activated, but htop shows me that while the program is running, I am only getting activity on one core (the program maxes out the one core with consistent usage between 97% and 100%).

I have read that many programs are not written to take advantage of multiple core cpu's. However, I am just hoping that there is some way to get this program to take advantage of the extra cores. Does anyone know of a way to invoke programs from the command line which would spread the workload out among additional cores?

Here is the output of uname -a:Linux linux #1 SMP PREEMPT 2011-02-21 10:34:10 +0100 i686 athlon i386 GNU/LinuxAnd here is the output for one of the cores from cat /proc/cpuinfo:processor : 5

vendor_id : AuthenticAMD
cpu family : 16
model : 10
model name : AMD Phenom(tm) II X6 1100T Processor
stepping : 0


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Programming :: Multi-core Support - Control On What Core Will A Thread Run

Oct 31, 2010

Is there any Linux API that will let me control on what core will a thread run? If not, do I have to use assembly language?

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Programming :: Get Process Running CPU Core And The Utilization On That Core?

Apr 27, 2010

Assume someone bind a particular process to a particular CPU core(In multi core machine) by using sched_setaffinity() like functions. Then how we can get that process running core id and CPU core utilisation of that process on that running CPU core(Pragmatically or by a Linux command)?.

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Fedora Installation :: Upgrading From Core 4 To Core 10?

May 20, 2009

I have created a virtual machine of a system running Fedora Core 4 and I need to upgrade it to Fedora Core 10. Based on what I have read, it iis possible so I started theupgrade process. I get an error message saying that /dev/hda6 (my root paritition does not exist) even though it does.

Does the installer need to read a label from /etc/fstab? I executed tune2fs -L / /dev/hda6 amd ,and added LABEL=/ for the corresponding entry for fstab. but the FEDORA CORE 10 is still giving the same problems for the installation process. Should I upgrade to an intermediate verson like Fedora Core 7 first?

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General :: Processes And CPU 4-core - Which Core The Program Used?

Mar 26, 2011

I've a program that launches new processes, and wait for them to die before it exits. So, for example, my program is a process, and it launches 3 more processes, and when the 3 child processes end, it will exit.

As you see, at end of the example, the program used a total number of 4 processes.

1 - Now, I'm running this program in a CPU with 4 cores. This means that the program used each core for each process?

2 - How can I know which core the program used?

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Programming :: Core Dump Issues. Program Crashes But Does Not Generate Core Dump File?

Oct 7, 2009

I want to generate core dump files from my program when it crashes. Its a pretty big process and has about 10-11 threads in it.I have followed the documentation to enable core dump by setting ulimit to unlimited etc. I quickly tried "A demo program creating a core dump" from the following webpage, which succeeds in Segfault and dumping a core file in the directory that I configured.However, I tried running my original program and caused it to crash. I did this by making calls to kill(), raise() or the same null pointer access as shown in the webpage above. In each case, my program crashed but did not generate a core dump file. Am I missing something?My program is in C++ and my environment is Redhat 9.0 (kernel 2.4.20)

Going through the "Why do I NOT get a core dump?" section on the same webpage as above, I can see two potential problems. One - there are issues with the suid/sgid (bullet # 6). I am not able to change any settings with suid because my system does not contain either /proc/sys/fs/suid_dumpable or /proc/sys/kernel/suid_dumpableTwo, my program has threads in it and the bullet # 8 is the problem.

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CentOS 5 Hardware :: Infiniband (mlx4) Works On 16-core System But (now) Fails On 32-core System

Jan 27, 2010

We have a small cluster of 20 HP systems, all running CentOS 5.3 in an NFS-root environment. Half are quad-socket, quad-core Xeon E7340 @ 2.40GHz (total 16 cores), the other half are 8-socket, quad-core Opteron 8354 (total 32 cores). All systems have a Mellanox Infiniband adapter ("Mellanox Technologies MT25418 [ConnectX VPI PCIe 2.0 2.5GT/s - IB DDR / 10GigE] (rev a0)")

With kernel 2.6.18-128.1.6.el5, infiniband works fine on all systems.

With the update to kernel 2.6.18-164.11.1.el5 (and both types of node running the same NFS-root image), the 16-core Xeons still work fine. Infiniband no longer works on the 32-core Opterons. Specifically, either the ib0 interface fails to appear, or it does appear but when configured with an IP address, doesn't actually work. In either case, loading the IB kernel modules takes a long time, but I haven't instrumented the load script yet to see which module, if any, is at fault. More errors listed below.

However, if I tweak the BIOS of the 32-core systems to reduce the per-socket core count to 2 (so effectively 8-socket, dual-core, down to a total of 16 available cores), Infiniband starts working again. Putting it back to 32-cores makes it fail. Booting the older kernel makes it work again. In summary: old kernel, IB works on all systems. Newer kernel, IB only works on 16-core systems.

Updating the IB firmware from 2.5.0 to 2.7.0 (latest available) doesn't help. I also did a full 'yum update' to make sure that libmlx4, openibd all other associated packages were up-to-date. Doesn't help either.

Some errors that appear on 32-core nodes:

ib_query_port failed (-16) for mlx4_0
ib_query_port failed (-16) for mlx4_0
mlx4_core 0000:04:00.0: SW2HW_MPT failed (-16)
mlx4_core 0000:04:00.0: SW2HW_MPT failed (-16)


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Ubuntu :: Dual-core - One Cpu Always At 100%

May 2, 2010

I have a dual-core computer that I just upgraded to lucid lynx. when looking at the system monitor, one of the cpu's is always running at 100% and its not always the same one. Is this normal or do I have an issue? I would really like some info.

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Ubuntu :: Dual Core 100% CPU Usage?

May 27, 2010

Interested to find out if this is normal or not. I am running a Intel Core 2 Duo processor and the system monitor keeps showing one of the cores at 100%, and the other fluxuating normally. Is this normal or a bug with the system monitor. I am running Compiz, but that is pennies to the comp. It seems that about every 1.5 minutes the cores "swap" the 100% usage, but it always ends up with one core at 100% and the other core doing normal stuff.

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Ubuntu :: Python 100% On One Cpu Of Dual Core?

Jul 4, 2010

my laptop fan was blazing like crazy for a while with only firefox and pidgin open. and even after closing firefox, it still continued. i took a look in htop, and appears that python is sucking 100% of 1 of the two cores all the time. it occasionally swaps core, but it always keeps 1 core completely occupied. i'm currently on lucid x64.

screenshots of htop and system monitor attached.

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Ubuntu :: Only Single Core Active On Quad Core AMD When Acpi Is Active?

Jun 8, 2011

Only Single core active on quad core AMD when acpi is active.with acpi=offuname -aLinux dvip4 2.6.32-30-server #59-Ubuntu SMP Tue Mar 1 22:46:09 UTC 2011 x86_64 GNU/Linux

cat /proc/cpuinfo
processor : 0


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Software :: Install Older Version Of Gcc 2.95.3 In Fedora Core 8 Or Fedora Core 12?

Mar 14, 2010

i download the rpm package of gcc .

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Fedora Installation :: Core 11 And Windows 7 Dual Boot?

Nov 3, 2009

I just installed Windows 7 Ultimate on my computer and I want to install Fedora Core 11 and dual boot my system. I have been on the net looking around, but I can't seem to find any suggestions on how I would do this. Can someone help me or give me a URL(s) that will give me a step-by-step guide on how to install Fedora Core 11 on a Windows 7 computer?

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Fedora :: AMD 64 Dual Core With A GeForce 210 Pci-x Graphics Card?

Dec 13, 2009

I have the latest everything (kernel, nvidia drivers and kde) and there seems to be a problem in that if I click on the K menu, or grouped windows in the taskbar, or anything in the notification area which causes the computer to freeze for 7 - 12 seconds. Anyone have any ideas what could be causing this?

It's an AMD 64 dual core with a GeForce 210 pci-x graphics card. The issue happens either with out without compositing.

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Fedora Hardware :: I7-640M Dual Core Recognized As Quad?

May 27, 2011

I installed Fedora 15 on my relatively new Laptop machine and stumbled upon an odd thing:Even though my CPU is an Intel i7-640M dual core (2x 2.8 Ghz) it somehow seems to be recognized as a quad. System monitor shows 4 CPUs (all of the used to some extend) and even "cat /proc/cpuinfo" gives me 4 processors:


processor: 0
vendor_id: GenuineIntel
cpu family: 6


At the same time the system (while relatively stable) is incredibly slow when it comes to complicated calculations (I do neuron simulations on a custom C++ framework).

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Ubuntu :: Install Coreboot On A AMD Athlon II X2 240 2.8GHz Dual Core?

Apr 25, 2010

I install Coreboot on a AMD Athlon II X2 240 2.8GHz Dual Core? I am looking to buy a new computer that I can install Coreboot on.

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Ubuntu :: 1 Of 2 CPUs Always Stuck At 100% Acer Asprire 5738G Dual Core?

May 1, 2010

I have fresh install of Ubuntu 10.04 LTS Added Wine from Software Center but have no any Win apps loaded or running yet. I have also enabled visual Effects and the system installed and enabled NVidia's driver for the video-card after which the picture quality improved.
Here is the screen of my CPU monitor (sorry labels arre in Russian but the charts are quite intuitive) As you can see this 100% load "jumps" from one core to another periodically. On the Processes tab there is nothing fancy:

Less than 10% processes load. I have tried to play with CPU Clock Gnome widget, it doesn't really change the picture whether I use MAX CPU clock of 2Ghz or reduced power-saving 1,2 GHz. I have found couple similar cases on forum but see no solution so far.BTW, I have already launched the update manager and currently Ubuntu does not offer any new updates.


PS. In the attachement - Report of some built in System Diag Tool

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Ubuntu :: Should Flash Player Be Using 60% Of My Dual Core Cpu - Ati Drivers - Pics Inside

May 3, 2010

Now this is a fresh install of Ubuntu 10.04. I have done nothing but follow the steps on installing flash and ati driver from the main site. I have this problem on my desktop too which also has ATI graphics but with a AMD cpu. The desktop was upgraded from Ubuntu 9.10 and the driver installed from ATI site like my laptop. This is really troubling because while the video is in full screen its using over 90% of my cpu?? Then my laptop gets really hot so I just switch back to Windows 7(which only uses 15%). Last time I had this problem was with the FGLRX proprietary drivers on Ubuntu 9.10 with the desktop.

Ubuntu 10.04
Intel Core 2 Duo 2.1GHz
ATI HD 4650 1GB

video I'm trying watch: [url]

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Ubuntu Installation :: 10.04.1LTS Freezes In Pentium Dual Core Laptop?

May 6, 2011

I have installed Ubuntu10.04.1LTS in my Desktop amd64 computer. I also downloaded the same version for i386 processors and tried to install the OS for my HCL Pentium Dual Core T4300 @2.1Ghz 4GB RAM laptop, details of which are given in the following two screenshots: dscf0105.jpg and dscf0106.jpg I already have Debian Lenny 5.0.4 installed on the laptop dscf0104.jpg and the laptop works fine when I run the Debian OS or Knoppix liveCD image stored in the HDD of the laptop. We all know that the Ubuntu LTS live CD leads to the following option: Screenshot.jpg However, in my laptop the operation freezes before we can reach the above option. The screenshot explains the situation: dscf0107.jpg I know I could always use one of the alternate downloads and install the OS from it. But my point of contention is: where is the matter going wrong? Can't we use the graphical installer CD to do a CUI installation?

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General :: Correct Processor Family For Pentium Dual Core T2390

Feb 23, 2010

Compiling a kernel on this machine first time and get upset with which processor family/type/options to select for my Intel Pentim Dual Core T2390.Does sombody know how to configure kernel better for this processor?

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