Why does ubuntu only see a single core on my quad-core cpu? All cores are enabled in the bios.
Here are some details about my hardware...
$ dmesg | grep Phenom
[ 0.812775] powernow-k8: Found 1 AMD Phenom(tm) II X4 810 Processor processors (1 cpu cores) (version 2.20.00)
$ uname -a
Linux xyz 2.6.32-31-generic-pae #61-Ubuntu SMP Fri Apr 8 20:00:13 UTC 2011 i686 GNU/Linux
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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.
View 6 Replies View RelatedJust a quick question. Does Kubuntu Karmic support core 2 E8500 out of the box or do you need the SMP kernel?
View 3 Replies View RelatedI'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
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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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
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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?
View 2 Replies View RelatedI 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.
View 14 Replies View RelatedAssume 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)?.
View 5 Replies View RelatedI 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 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?
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)
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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
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cat /proc/cpuinfo
processor : 0
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I decided to go and install ubuntu 10.10 today. I have two partitions on my HDD. Ubuntu only sees one HDD, and not the two partitions. I get no option to dual boot vista and ubuntu at all. It is only format and use the entire disk, or install manually. I go into gparted and all ubuntu sees is one unformatted HDD. But vista sees two partitions. I have all of my media on one partition. I REALLY don't want to go and format the entire drive to lose my things. Is there a work around for this? I have no access to any other PC.
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View 4 Replies View RelatedI have three computers; Ubuntu desktop, Windows 7 laptop, and OSX laptop 10.5.8. I have a shared usb hard drive on my Ubuntu desktop. My Windows 7 machine sees and accesses it just fine. My OSX computer sees it in the finder window, but says it can't access it because it can't find the original file. I have tried to "repair the alias" but it doesn't work. I have shared another folder on the Ubuntu desktop, but the new share is on the desktop internal hard drive. OSX can access that share with no problems. What in the world is going on? If Windows 7 can see and access, is this an OSX problem or is there a terminal command that I am missing? I am networking using Samba on the Ubuntu computer and the explorer/finder windows on the Windows7/OSX computers.
View 1 Replies View RelatedUsing Ubuntu 10.04 x64. Laptop is HP 8430, CPU=T7200, 64bits, VT enabled. Video should probably ATI X1600.
Just upgraded from 3GB to 4GB. BIOS screen shows laptop has 4GB. surpringly, within Ubuntu, System Monitor shows only 3.3GB. What is the reason?
I have a Black Macbook 2,1 (late 2006). I have been running Mac OS 10.5 with 4GB installed. I am aware that the 32-bit RAM limitation applies to this machine, per this thread:[URl]... Currently my machine is running Lucid Lynx 64-bit (Ubuntu 10.04). "top" reports the following max memory available:
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Mem: 3060512k total Is there any way to bump that up, anywhere closer to 4GB?
i recently started dual booting with Kubuntu using an external HDD. GRUB works fine, but it sees two Kubuntu's on the drive. In GRUB, i see "Ubuntu-Linux Kernel (for some reson its not identified as Kubuntu) on /dev/sdb1 (external drive)", then i see recovery mode beneath it, and the exact same line right below recovery mode, followed by another recovery mode. strangely, selecting either one boots into kubuntu no problem at all. is this a problem and is there anyway i can delete the duplicate entries?
View 1 Replies View Relatedi download the rpm package of gcc .
View 10 Replies View RelatedI got a 450 GB hard drive from which fedora boots from.However when i look at grub,grub> geometry(hd0,0) and do the cylinder/head/sector math, it only comes to 4GB instead of 450gig. why it sees only 4G?
View 1 Replies View RelatedI'm getting rather bewildered.
I followed these instructions to setup my wusb11 driver using ndiswrapper:
[URL]
But when I try to ifup the interface, I get:
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 4
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 10
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 14
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 3
No DHCPOFFERS received.
iwconfig shows that no essid is assigned, even though I have specified one in /etc/interfaces.
Then if I go through the desktop gui Preferences -> Network to setup my wireless connection, /etc/interfaces does not seem to change but iwconfig then reports the essid is assigned.
Anyway, on my default taskbar there is a wireless icon. Clicking on that shows the wireless access points in the area. I see my own. When I try to connect to it, it prompts for my wep key. I enter the key, it thinks, and then acts as if I'd entered the wrong key.
Specifically of course, I'd like this to get fixed so that I can happily surf the net again, etc.
But I also I'm wondering why it seems that there is a disconnect between /etc/interfaces and Preferences->Network. If I type in a WEP key in the gui, I would think that it should appear in /etc/interfaces.
I'm definitely a Ubuntu wireless newbie, and not very experienced at Ubuntu anyway.
I am using Ubuntu 9.1 and want to connect to my other computer (win 7) on my home network. I installed Samba...and it sees the 'windows network'...then it sees the pc I want to connect to, but when I try to dbl click on its name, I get 'unable to mount location, failed to retrieve share list from server'. There are at least 8 publicly shared folders on that PC that other Windows pc's can connect to without problem.
View 4 Replies View RelatedI have just installed Ubuntu 11.04 on a new computer which also has Windows XP installed. This computer is connected to the internet via a USB Zonet ZEW2590 802.11N wireless card with the Ralink RT3070 chipset. Ubuntu sees the wireless card and it connected to my wireless router without any problems. When I look at the connection information it says the wireless card is connected at 24mb/s and one time it said it was connected at 54mb/s. The problem is that when I go into Firefox and type in a url (such as www.yahoo.com) I see a message at the bottom of the screen saying "Looking Up Yahoo and then it does nothing for several minutes. Then I get a pop-up box that says "Server Not Found".
View 14 Replies View RelatedI've tried so many things to get it to see Debian. I tried the super grub 2 disc on a CD and on a flash drive via unetbootin. Neither worked successfully like the site showed. I tried chrooting from a Ubuntu Live CD, I did update-grub grub-mkconfig, grub-install to each of my hard drives and even tried upgrade-from-grub-legacy (even though it's already upgraded from grub legacy)!
If I recall correctly, the super grub 2 disc says something about an error with the filesystem so I'm guessing this has to do with the fact that I'm using ext4 on my Debian Squeeze installation?
I thought I knew my way around a little, but apparently mounting is still a complete mystery to me. I'm trying to back up my data with Knoppix since Ubuntu won't start up. something weird is happening with the keyboard and it starts spamming ^[[26~ across the splash screen. When I try to read my hard drive, Knoppix tells me "mount: wrong fstype, bad option, bad superblock." It seems like it should be a pretty common error, but I haven't found any anything helpful and understandable that doesn't involve rebooting (won't get me anywhere with Knoppix). I think it has something to do with Knoppix insisting my drive is hda instead of sda, though I have read that Ubuntu likes to tell you hda is sda anyway. Knoppix is the only distro that has worked on a live boot so far.I've thought of trying dd, dd rescue, or just cp onto my external, but I don't know if Knoppix's hda business will make a working backup. The other computers around are all Windows with no extra space, so I don't know what the easiest and safest way is to test wether the back up worked.
View 14 Replies View RelatedI'm trying to get my Creative Zen V Plus working. Ubuntu sees it when I plug it in, and suggests programs to open it with. Also, it shows up under "$lsusb", but when I tried using gnomad2 and kzenexplorer, they couldn't find any jukeboxes. Also, rhythmbox doesn't show any players.
View 3 Replies View RelatedI have 2 Hard drives, the original 30GBs with Windows XP on it, My son put 2nd hard drive into pc as slave (400GB), no problems, WinXP recognised 2nd drive. This was all a way to give 'good ole Mum' a chance to muck about with Linux.Got a Linux Format Mag with Ubuntu 9.10 on it, amongst others, but this one I knew from previous use. I have installed it on the 2nd hard drive, not sure if I correctly (manually) partitioned but I put ( I believe) a home partition, a swap partition, left ( so I thought) a 3rd partition space, and said install. Ubuntu runs fine and see the small HD with WinXP but WinXP doesnt see the HD with Ubuntu, and I wanted to use the 3rd partition for the WinXp as I need to use that for Grant writting I do for not for profit organisations govt depts that I apply for grants from are MS freaks, that said, all runs ok but what have I done that wont let WinXP see to utilise the 3rd partition. Be kind, I have a load of senior moments these days
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