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.
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.
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?
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?
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.
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 22.214.171.124-1.2-desktop #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
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).
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?
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)?.
I am in school for my CIS degree and the book I am using this session covers Windows XP and Fedora Core 4. I am having trouble finding & downloading Fedora Core 4. My question is: Is there a big enough difference between Fedora Core 4 and Fedora Core 14 that I would not be able to use 14 instead of 4?
This is weird. New box, intel i5-650 cpu w/ 8 gb ram. Installed 10.04, did updates from a local mirror, and box is *fast*.
But /proc/cpuinfo only reports one core.
The output of free indicates that all 8gb are recognized, uname reports SMP.
Using Ubuntu 10.04.
Code: root@sj-desktop:~# dpkg -l | grep linux-image ii linux-image-2.6.32-25-generic-pae 2.6.32-25.45 Linux kernel image for version 2.6.32 on x86 ii linux-image-generic-pae 126.96.36.199.27 Generic Linux kernel image
As this thread [URL]... reached over thousand posts, it's obvious that these freezes (which actually boils down to keyboard and mouse not being listened to by X server, so "not working") hit large numbers of Ubuntu users. As that thread is already very large and hard to read I'd like to advance a hypothesis here : This problem occurs only on multi-core CPUs.
I've installed 10.04 on two machines: and old box with a Duron and new one with quad core. The old box runs just fine with 10.04. The new one - you know Has anyone exeprienced this problem on a single core machine?
I am running CPU tests on a radio controller to determine max simultanious calls. A tool using top was developed so that we could get a good look at what exactly was happening on the process level, however we are mainly interested in one object running on the box.The box has a single core Celeron processsor running the Wind River Linux platform. The CPU usage from my object is frequently spiking over 100%. Doing some research online so far has led me to the fact that a multicore processor can do this however I have found no mention of a single core processor displaying this behavior.
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?
Recently I was forced to "downgrade" my AMD64 Squeeze installation to 32 bit Squeeze. The installation was (obviously) made from scratch. Everything else seems to be working fine, but there is only one cpu core out of four detected. On AMD64 kernel all four cores were functional. Now what?
$ uname -srv Linux 2.6.32-5-686 #1 SMP Mon Jun 13 04:13:06 UTC 2011 $ cat /etc/debian_version 6.0.2 $ cat /proc/cpuinfo
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.
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)
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.
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.
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.
I set up my home server like 3 year ago on a Fedora core 4, I am running a NAT, firewall and FTP very smoothly on it. In the past 3 years, it has been doing perfectly without any modification/ upgrade. But recently, I just realized I might need a VPN server on it, but the recent release of OpenVPN doesn't support Fedora core 4 anymore, therefore I suddenly want to make an upgrade. I've read the articles/ manual for Fedora 13, yet I do not find any suggestion on how to upgrade to 13 from core 4.
how can I do an upgrade in the easiest manner as I don't want the server cease working too long (I need its NAT for my network).
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?