I'm running Linux on an Intel Core 2 Duo processor. When I apply power to my computer, it boots into one core but appears to leave the other one idle. On the screen, it prints:
....
SMP: Allowing 2 CPUs, 1 hotplug CPUs
.....
I can confirm that only 1 CPU is active by logging in and examining /proc/interrupts and /proc/cpuinfo. After issuing a "reboot" command, the screen shows:
...
SMP: Allowing 2 CPUs, 0 hotplug CPUs
...
So, when I do a cold boot, I one get 1 CPU. When I do a warm boot, I get both CPUs. This is a problem for me because I'm running Linux on an embedded board and I need both CPUs to be running.
I've played around with BIOS settings, the boot string, kernel configuration, and CPU hot plugging. I can't seem to find a way to get both processors running without booting the system twice.
I thought that the CPU hot plugging path showed some promise but I can't seem to get that feature working on my system. The first issue is that the Linux documentation doesn't seem to match with what I'm seeing. It states that you should be able to go into /sys/devices/system/cpu/cpuX/ and write a zero or a one to the file labeled 'online' to disable it or enable it. When I go to /sys/devices/system/cpu I only see a directory for cpu0. There isn't a directory for cpu1.
After a reboot, I do see two directories int /sys/devices/system/cpu (cpu0 and cpu1). At this point, it won't let me 'offline' the second processor. The echo command gives me an error. (By the Way: the 'online' file in each cpuX directory has read only permissions.) This error occurs after I've changed the permissions on the file to read/write.
I confirmed that the following parameters are set in my .config file: CONFIG_HOTPLUG, CONFIG_HOTPLUG_CPU, CONFIG_SMP, CONFIG_SUSPEND_SMP
I've done searches on google until my eyes popped out and can't find much information. I see others have had similar problems but they all seem to link back to ACPI in BIOS. I've already played with all of those settings and I didn't see any effect. One reason I don't think it's a BIOS problem is because a warm boot (reboot) seems to 'fix' it.
I've tried different kernels, different distributions, and different computers. I see similar behavior in all configurations. I feel like I'm missing something fundamental.
i have a own internet cafe that use a Fedora Core 8 as a dhcp and proxy server, and i had two normal users that created in my server to monitoring the billing of client who use the internet. But was delete those users and create a new one and restarted the server. and the problem is when booting process running suddenly hang and cannot continue but the server doesn't showing any errors and cannot continue the booting process.....
I was bugging around with my nvidia driver and while reading README.txt I saw the following:
"NVIDIA has noted that in some distibutions, i2c support is enabled. However, the Linux kernel module i2c-core.o (2.4) or i2c-core.ko (2.6), which provides the export infrastructure, was not shipped. In this case, you will need to build the i2c support module. For directions on how to build and install your kernel's i2c support, refer to your distribution's documentation for configuring, building, and installing the kernel and associated modules."
So I checked if I have i2c-core.ko and I saw that it is not present as a built module, but only as a source code. So, my question is, is there any reason that the module is not shipped with openSUSE 11.3 x86_64 (I use the kernel HEAD repository)? Actually, does it make sense to use this module if I want to monitor the temperature of my GPU with sensors? How can I compile only that module and install it?
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'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?
installing on linux i try to install VLC and get [user@localhost ~]$ sudo yum install vlc Setting up Install Process Parsing package install arguments Resolving Dependencies
--> Running transaction check ---> Package vlc.i386 0:0.8.7-0.8.fc8 set to be updated --> Processing Dependency: vlc-core = 0.8.7-0.8.fc8 for package: vlc [Code]...
I thought running an update from my OpenSuse 11.3 dvd would solve my problem, but It doesn't; I'm not given the option to choose a gui environment. It leaves me at a prompt here. /home//
I have a Fedora / Windows 7 dual boot machine. I went to a website that explained how to do it step by step with pictures. Except now I can't boot back into windows, which I need for work.I installed grub but don't know how to find it or set options. Total Newb) Windows recovery sees my installation but tells me that there's no problem with it, and I can find files in an image. When grub comes up it offers me boot choices, but Other takes me to a screen that says, "BOOTMGR is Missing" Ctrl-alt-del to restart.
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.
I was having a dual-boot configuration, Ubuntu 10.10 and Windows 7 on the same disk. After resizing the windows 7 partition, after this screen [URL]... and after selecting windows 7 , I get "bootmgr is missing" message. Ubuntu loads normally. Here's my results.txt from boot info script:
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
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?
I have a system with 2 hard drives. One drive (D) is my Ubuntu 10.04 system and the other drive (C) is my Windows XP system.
When I boot, I get BIOS then GRUB. If I choose the XP selection I am taken to a Boot Loader that now longer works. I get an error saying: "Windows could not start because the following file is missing. <windows root> system32hal.dll Please reinstall a copy of the above file.
Can I remove the boot loader and let Grub take me directly to the C:/windows? If so how?
I have tried searching for the same problem but can't find it. Close but not exact. I have a dell optiplex I use for internet surfing. I do a reformat every few months to get the junk off it.I do a reformat to clean the drive and load XP PRO then load ubuntu 7. or 8. It gives me the option to use either at start up.
I did it a few weeks ago and it has been running fine until I did updates of both XP and ubuntu. When I it fired it up Win XP worked fine but when I choose ubuntu I would get the corrupted or missing hal.dll error and it wouldnt go any further. Several reboots with the same result XP works but not ubuntu.I did a reinstall of the hal.dll file using XP disk for repair according to britec on ..... (but I didn' t do the second step yet).Now I still get the corrupted or missing hal.dll error when I try to get into ubuntu and if I choose XP it freezes. I try going into safe mode and it loads but (wireless) mouse/keyboard won't work.
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.
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 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 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've been using Linux (Fedora) since 2005 (when I happily abandoned Windows) and loved every minute of it. No installation or other unresolvable problems. But now, I am totally stuck. A month ago, they just gave me a new desktop in the office: Dell Optiplex 960 with the Intel Core 2 Duo vPro chip. So I waited for Fedora 11 to come out, burned the x86-64 Install Media on a DVD, repartitioned the hard drive like I always do on new Windoze machines, and began installing. The install process gets to this announcement and stops:
mounting /tmp as tmpfs... done Then, after a 5-minute wait, if I push the power button on the computer for a hard reboot, then it says:
running install running /sbin/loader and then stalls for good. Then all I can do is hard-reboot again.
So, out of curiosity (and for other reasons), I tried booting the machine from other linux disks: Knoppix, and SystemRescue (www.sysresccd.org). They all stall at different points. The funny thing is that both Fedora 11 x86-64 and SystemRescue happily boot on my personal one-year-old Lenovo T61 Intel Centrino Duo VPro laptop.
I get a feeling that somehow the Intel Core 2 Duo vPro is causing the problem. I also think that there is got to be someone else out there who either had this problem, or was able to install F11 on similar Dell box. Google search did not produce actionalbe answers for me.
Every linux i try to boot whether its a live cd or a complete dvd dvd installs and then fails to boot latest i tried mandriva spring edition 2009 i have a portable usb drive in which i install my linux everytime its a seagate free agent go i always used it for my linux which i frequently change i am not able to boot into any linux since i installed a graphics card xfx geforce gts 250 in my system there is a kernel panic whenever i try to boot something
sometimes its like:
Either of them for any given flavor. i have tried too many installations
I have an HP Pavilion m7480n PC with Windows XP installed on the C-drive. I successfully installed FC 12 onto the spare USB drive. When I rebooted the PC all I got was a blinking underscore at the extreme upper left position of a totally black screen. After a bit of experimenting I found that if I hit the F1 key during the boot process, go into the BIOS setup, do nothing within the setup, and press ESC to get out of the setup then the PC will go back into the boot cycle a second time. During the second time however a small text message appears with words to the effect "Press any key to enter GRUB..." after which the GRUB splash screen comes up with the choice for FC 12 or "Other" (referring to Win XP). At that point I can boot into either one.
i am having a problem with my dual boot setup. I originally installed windows XP on a 100gb hard drive, from there i downloaded and burnt ubuntu off so i could install it on my 200gb hard drive. For a little bit i struggled to even get it to install because it wouldn't recognize my onboard nvidia graphics, i ended up having to get an alt boot disk and fix it with technique in this link:
[URL]
Now after the bios boot, my screen shuts off for awhile and takes me directly to the login screen for ubuntu. No Grub, no windows boot options, nothing. I tried booting windows by choosing it from the bios boot menu but all it does is hang at prompt and doesn't boot at all. I tried the live cd fix and reinstalled grub but nothing changed. What i think is happening is that it boots the Grub menu but it doesn't display it because of graphical confrontations. It hangs for about 10 seconds, the grub default time, and then turns my monitor back on to display the Ubuntu login screen.
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)
