Debian :: 100% CPU On One Core Even After Reboot
Jul 28, 2015
I have a debian system with the following version, see below. My problem is that one one single core of 4 it's running 100% all the time and i cant seem to find out why. The load is also high(load average: 0.91, 0.75, 0.40) because of this. This keeps happening even after reboots.
root@Cyberdyne:~# hostnamectl
Static hostname: Cyberdyne
Icon name: computer-desktop
Chassis: desktop
Machine ID: af90d9838fc14929818d8d52719fc2ae
Boot ID: a3ef416a7fb4404ca4b9c122bdb1145a
Operating System: Debian GNU/Linux 8 (jessie)
Kernel: Linux 3.16.0-4-amd64
Architecture: x86-64
Distributor ID: Debian
Description: Debian GNU/Linux 8.0 (jessie)
Release: 8.0
Codename: jessie
IMAGE : [URL] ....
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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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Aug 12, 2009
I just got an update that installed, and after a reboot I've got one core at 100%. The "you need to restart" icon in the notification tray said "glibc glibc glibc glibc nscd". Now that I look at it, It's switching between both cored. This behavior is consistent over multiple full reboots as well as kexec reboots.
Edit: Strange, just when I finished, the CPU load settled out and now everything is fine. I wonder what was going on. I'm rebooting right now to double check. Edit2: Yep, same issue 100% usage on one core. And it probably will level out soon. I'm not sure what could be causing this. I assume that glibc could be the issue.
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Feb 17, 2011
I have a laptop, installed with window XP. I just installed Fedora Core, re-formatted all parition on the system, and installed default packages. The installation was successful. But after I took out the installation CD and reboot the system, chose Fedora core (the only banner), the screen just become green, and nothing else from there.
The only thing I am not 100% sure is, during the installation, my monitor was probed as unrecognized. I have tried both 'go with default' and specify one "LCD 1024x...", but either way, after the installation, system won't reboot.
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Jan 14, 2011
I installed a version of "Fedora Core" similar to "Red Hat LINUX nine". I have a dual boot system. When I rebooted my system I was able to select Fedora but then after a while Fedora locked up.
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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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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
[Code]....
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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 2.6.37.1-1.2-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
[Code].....
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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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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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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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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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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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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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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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Jun 10, 2010
What's the command to install kde-core? Like gnome-core, aptitude install gnome-core
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Dec 14, 2010
Can someone tell me what the architecture of iMac Intel Core 2 Duo is? I am trying to figure out which of the following images given on the webpage below to download:[URL]..This is the list:
[alpha][amd64][arm][armel][hppa][i386][ia64][mips][mipsel][powerpc][sparc][s390][source][multi-arch]
I think there are two different images (namely i386 and ia64) for intel-based systems, right? Which one should I download for my Intel Core 2 Duo? Is this a 64-bit architecture? Should I use amd64?
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Aug 24, 2011
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Aug 22, 2011
the appropriate debian designation that will work on an Intel Core i5 430 M processor.
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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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Jun 22, 2011
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
[Code]....
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Aug 7, 2011
I have this package dependency question for a while. I have brand new Squeeze system. I selected desktop during installation. Gnome is default system but I turned off gdm3 and uses fluxbox as window manager. I understand if two packages are tied together funtionally so that removal of either package terminates one feature. Above cases, many small packages only depends on the core packages. The core packages work fine without games, other programs.
There are so many programs that I want to remove in the system. For examples, ekiga is a VoIP program that I never use it. When I tried to remove it using apt-get or aptitude, it suggests entire gnome packages will be removed also, which is illogical. The only solution I found is I need to manually remove the package files. I haven't tried it yet.
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Feb 7, 2010
After going from Debian Lenny to squeeze, everything was going OK, apart from 8 broken packages of which I was easily able to fix 7 of the packages. The last one is x-org core, which comes up with the error message /var/cache/apt/archives/udev_150-2_i386.deb returned an error. From all my research it indicates that an update from kernel 2.6.26-2-686 to a later version is required due to 150 udev requiring the support of the CONFIG_SYSFS_DEPRECATED. My next question is where to start, do I need to add a linux-image repository in sources.list and then use the command-line or am I headed in the wrong direction.
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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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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)
[Code]....
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Jan 5, 2011
I just installed the lenny (amd64) on my new core i7 870 computer (with netinst), but the kernel failure message appeared everytime I booted into gnome. I don't know how to solve this problem. Sorry I don't have much experience with installing linux, though I have been its user for a few years.
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May 22, 2011
Im looking at buying an HP Proliant server with 4 cpus, like this [URL] will Debian be able to run on this and use the 4 CPUs?
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Jul 10, 2010
I am running Debian Squeeze 32bit with gnome-core installed. When I alter the acceleration or sensitivity within the pointer speed section of gnome-mouse-properties, my mouse does not act differently. Has anyone else encountered this problem? How can I change my mouse sensitivity? I have installed Debian Lenny previously and I recall that I was capable of changing the sensitivity.
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Feb 19, 2010
I have Lenovo 3000 n200. I'm new in debian, but it's great to me! I wan't to stay with this distro, but i Can't upgrade this to testing or unstable version. Lenny have too old packagges for me. All versions of squeeze (downloaded or upgrade from lenny) is broken. I can't run xorg. For about 2 weeks i'm serching for answer and i only found that this is xserver-xorg-conf. That's true this is the package that is broken, but cannot install this.
When i upgade system the synaptic package manager write me one package is broken (xserver-xorg-conf), so i delete it and install one more time. This same problem. So i downloaded and i have this same problem. When i restart system i cannot run xserver and gnome.
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Dec 12, 2010
i updated to Sid and installed gnome minimal (gnome-core). But, there are 2-3 days ago, Totem and Evolution became gnome-core's dependancies. Actually on Sid, i use VLC and Icedove and when i want to uninstall Totem and Evolution, "aptitude" wants to remove gnome-core too. I would like to know if it's possible to remove these applications without uninstall gnome-core completly?
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