I've tried searching the forums / google and haven't been able to come up with anything... in Debian-based distros there's an option that can be set to allow boot concurrency so that multiple processor cores can be used for the boot process. Windows also has an option similar to this to specify how many processor cores to use for boot.
Is there an option for multi-core booting in Fedora?
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 RelatedIm running 64bit centos 5.6 and using virt-manager.On one of my guest OS's, Windows 7, The max Physical CPUs is 2, you can have unlimited CPU Cores however. (like my machine i use for work has 1, 4 core processor).The issue im having is xen only allows you to set the vcpu arguemnet in your xen config file. How can i set it so that 1 CPU has several Cores just as windows would recognize this machine if i were installing directly to the hardware vs via a VM.Ive searched for 2 days staright trying to address this issue, very little progress, Does anyone know where a XEN support forum is? all i get is the citrix xen support forums.
here is the best info i have found on this, but i dont know how to change this for my CPU to work, when i enter this in my xen config it essentially ignores it and just takes the value of vcpu= so windows shows 2 CPUs each with ONLY one core. Id like 1 or 2 CPUS showing Several cores.The physical Hardware is 2x Xeon 5300 Quad Core CPUs.
> # Expose to the guest multi-core cpu instead of multiple processors
> # Example for intel, expose a 8-core processor :
> #cpuid=['1:edx=xxx1xxxxxxxxxxxxxxxxxxxxxxxxxxxx,[code]........
Many people have multi-core cpus supporting frequency scaling now, if you want to see if the workload is being evenly distributed then add as many CPU Frequency Scaling Monitor applets to the Gnome panel as you have cores/cpus. Then right-click each one and select preferences and choose which cpu to monitor.
Now compile a large program or run a cpu intensive game and watch how the workload dances around between the two (hopefully)
Some clever apps like gnome chess will multi-thread and make max use of both cores, sadly many others won't.
I will be relocating to a permanent residence sometime in the next year or two. I've recently begun thinking about the best way to implement a home-based network. It occurred to me that the most elegant solution might be the use of VM technology to eliminate as much hardware and wiring as possible.My thinking is this: Install a multi-core system and configure it to run several VMs, one each for a firewall, a caching proxy server, a mail server, a web server. Additionally, I would like to run 2-4 VMs as remote (RDP)workstations, using diskless workstations to boot the VMs over powerline ethernet.The latest powerline technology (available later this year) will allow multiple devices on a residential circuit operating at near gigabit speed, just like legacy wired networks.
In theory, the above would allow me to consolidate everything but the disklessworkstations on a single server and eliminate all wired (and wireless) connections except the broadband connection to the Internet and the cabling to the nearest power outlets. It appears technically possible, but I'm not sure about the various virtual connections among VMs. In theory, each VM should be able to communicate with the other as if it was on the same network via the server data bus, but what about setting up firewall zones? Any internal I/O bandwidth bottlenecks? Any other potential "gotchas", caveats, issues? (Other than the obvious requirement of having enough CPU and RAM).Any thoughts or observations welcome, especially if they are from real world experience in a VM environment. BTW--in case you're wondering why I'm posting here, it's because I run Debian on all my workstations/servers (running VirtualBox as a VM for Windows XP on one workstation).
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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Anyone successfully using VNC client on a Mac to control a Debian server?I have the vncserver setup on the Debian machine properly. But I'm having problems connecting to it from both a PowerMac running Tiger and a MacBookPro running leopard.I can connect no problem from a machine running Slack12.2, have not setup port forwarding on my router to connect remotely yet.My Debian machine is running the latest stable release of squeeze with KDE4.I originally tried this with RealVNC Enterprise for OSX but I'm not gonna buy it so I need another alternative after the 30 day trial ends as they have no free version for OSX.
The situation is that I do freelance graphic design on the PowerMac with Cinema4D and Photoshop so I spend most of my time on that machine which is located in my home studio in my attic. Aside from the MacBook and a Dell desktop(family machine)all my other machines and network hardware are in the basement. So to go from the attic to the basement everytime I need to do something on another machine is not practical, and the only other machine I need to access on a regular basis is the Debian box in the basement, this makes the most sense.
I also have a 14 year old living in the house and he's fascinated by all this and will meddle in anything he gets the chance to so all the Linux machines and network hardware need to be behind lock and key.
I need to set the CR4.MCE bit for all the cores on my system (4). I'd like to write a linux kernel module for that, but I am not sure how to proceed: How do you sequentially access all of the CR4 registers? I have read the Intel manuals and they describe a way to initialize each core, but this is done in the bios.
View 2 Replies View RelatedI have written a simple script which has to find required patterns from a bunch of files ( where each file is around 2 GB each,which contain the output of seq 1 10000000000000) on an 8 core machine.I am current forking 6 child processes which run simultaneously on 6 cores of the processor & have to search for the required pattern in 6 different files & inform the parent process when a pattern is found using a PIPE.
The problem is,when a child process is done reading a text file looking for a pattern,it is becoming a zombie process.It exits cleanly when i put a $SIG{CHLD} = "IGNORE"; in the script.Can any one tell me whats going on & how do i improve the communication between child and parent processes?
Code:
#!/bin/perl
use strict;
[code]...
I have installed OpenSuse 11.3 32 Bit in a virtual machine on an older computer on a Windows XP host and on a new computer with AMD Phenom II X4 965 processor.
With sysbench I tested the performance of mutex and on the new computer it is 3 - 4 times slower than on the virtual machine. Other performance tests with sysbench for CPU, memory and threads are faster on new computer like expected. I tested this, because I have a slower performance of table creation in MySql tested with sql-bench, where creation of 10000 tables lasts 45 seconds on the virtual machine but over 400 seconds on the new computer.
I have tested with kernel-desktop and kernel-default but there are not large differences. File creation was tested with bonnie++ and is on newer computer faster as expected.
My questions are:
- Why is the mutex handling on the multi core CPU slower than in the virtual machine and how to speed up this?
- Or is there another reason why table creation of MySql is so much slower on multi core CPU?
In my Open-Suse server I have a script, where makepasswd output(by default it generates similar passwords: cGyTbqpr, tpJ1LA, 33EXdo) is redirected to mkpasswd(which uses DES by default) in order to generate salted hash of this previously generated password. I would like to test the strength of this system. I have a quad core CPU, and if I start John The Ripper like this(I want to use -incremental:all flag):
john -incremental:all passwd
..only one core is utilized at 100%. Is there a possibility to make all four cores to crack this password? Or is this possible only after reprogramming John The Ripper? Or what is the algorithm for generating passwords with with -incremental:all flag? I mean if John generates passwords randomly in brute-force mode, then it's smart to start four different John processes simultaneously because then one of those four will find the password firs
I have installed fedora 12, now(after one week) I updated fedora 12 using the command, ' yum update'. Its updated when I restart it is showing two fedora 12 booting option along with windos7. how to remove one. But all the options are working, I am pasting the menu.lst file below.
Lokesh
[root@Lokesh Lokesh]# cat /boot/grub/menu.lst
# grub.conf generated by anaconda
# Note that you do not have to rerun grub after making changes to this file
# NOTICE: You have a /boot partition. This means that
# all kernel and initrd paths are relative to /boot/, e.g.
# root (hd0,4)
# kernel /vmlinuz-version ro root=/dev/sda6
# initrd /initrd-[generic-]version.img
# boot=/dev/sda .....
My question is a little bit complicated.Try to clarify it, fact is:
1. I want to install linux as primary OS.
2. I want to use multi-booting option when starting computer for choosing between windows/linux
3. I want to use virtual box in linux to use windows.
4. I want to use virtual box in windows to use linux.
Are these all 4 possible with single install of linux and windows respectively in 2 partitions? if so, what should I do after installing ubuntu?
In my environment all the servers are having more than 5+ cpu's.Please help me to find out from which CPU the OS is booting
View 5 Replies View RelatedI've been doing some computations at home and at work and have noticed some unexpected performance issues. The work machine is quite a bit more "serious" than the home machine, but sometimes the home machine outperforms the work machine. I'm curious what the dynamic is -- why this should be, and if I can tweak it at all.
Ultimately on both machines the computations are just a lot of very large arbitrary-precision integer linear algebra computations (based on the GNU multi-precision library). Reducing a lot of sparse but "large" integer matrices, finding the vertices on the boundary of high-dimensional polyhedra, and so on.
On my home computer (which has two cores), if I run a standard computation on only one core (the 2nd core near-idle), it takes 282s.
On the home computer running two identical parallel computations (the same computation as above), it takes approx 320s on each core.
On my office computer, with all cores essentially idle except for one core running this computation, it takes 196s.
On my office computer, if I have all 8 cores running full-out, and one of the cores is doing the computation above, it takes 356s on the one core that's running the computation.
Here are the details on my home computer:
i download the rpm package of gcc .
View 10 Replies View RelatedI have Linux Mint and Windows 7 installed on my laptop, and recently tried tinkering with EasyBCD, to use the Windows multi-boot loader instead of grub. Well, that didn't work out too well, because I ended up with the Windows boot loader with two options, Windows 7 and Linux Mint, however the Linux Mint entry just redirected me to grub, which wasn't what I intended.
I tried to put things the way they were, with grub as the only boot loader, and figured I'd do so by setting EasyBCD to skip the multi boot screen and going straight to the Linux Mint entry, which corresponds to grub.Well, now when I boot, I get the grub screen, but if I select the Windows 7 entry, it just redirects me back to grub, so I can't access Windows 7 right now. What can I do to fix this? Can I edit the Windows boot loader from within Linux?
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 wanted windows to appear first in my grub2 menu so I renamed the 30_os_probe file(or whatever it felename is) to 09_os_probe so that it comes before the 10 linux file, problem is whenever these files get updated the updater is unable to find the 30_os_probe file since I renamed it and recreates it... leaving me with two versions (09 and 30) with 09 being of course outdated.
The updater also fails to run update-grub and instead attempts to update grub.cfg manually... and fails. I had to manually do a sudo update-grub.
Is there any way to fix this so its all updated automatically while leaving windows the top choice? No manual intervention required beyond clicking "install updates"?
Also, is it possible to JUST have the Windows and Ubuntu choices, no Ubuntu recovery, memtest, alternative(older) kernels for Ubuntu, etc in the grub menu?
I have two hard drives windows 7 is on one of them and Ubuntu 9.10 is on the other. Both drives are 320GB, but different models of drives by Seagate. Both drives are detected by the BIOS and both drives are detected by Windows, but only one drive is detected by Ubuntu during the installation process. I had to literally disconnect the Windows drive to get Ubuntu to recognize the drive I wanted it on. Now that Ubuntu is completely installed and a new Kernel has been downloaded and installed it finally recognizes both drives as existing.
There is some kind of problem with the Installer and the original Kernel that kept it from seeing the second drive. I will literally have to manually edit Grub to get it to boot the Windows drive. How do I edit Grub? and what kind of Grub command would do the trick? I searched for "multi-boot" and literally read them all, there was one thread about multi-boot on multi-drives, but it did not fit because the Installer recognized both drives with that thread. I have to change the boot order in the BIOS to get the drive to boot that I want currently.
That is my disk
Code:
fdisk -l
Device Boot Start End Blocks Id System
/dev/sda1 1 3724 29912998+ 83 Linux
/dev/sda2 29256 30401 9205245 7 HPFS/NTFS
/dev/sda3 3725 4271 4393777+ 5 Extended
/dev/sda4 * 4272 12104 62918572+ 83 Linux
/dev/sda5 3725 4271 4393746 82 Linux swap / Solaris
I want ot install a new opensuse 11.4 as yest another OS. Due to the fact that I already have 4 sda partitions, I have to make some changes. What I am thinking about is to copy the sda2 (windows recovery) data to some folder etc (nevermind), then delete the sda2. Then I want to create a new primary partition for the new suse 11.4 and install it. What is worying me is the grub boot menu. I was planning to edit the new one (the opensuse 11.4), with old data.
Code:
###Don't change this comment - YaST2 identifier: Original name: linux###
title Desktop -- openSUSE 11.2 - 2.6.31.5-0.1
root (hd0,3)
kernel /boot/vmlinuz-2.6.31.5-0.1-desktop root=/dev/disk/by-id/ata-Hitachi_HTS542525K9SA00_080105BB0F00WDHE41DC-part4 resume=/dev/disk/by-id/ata-Hitachi_HTS542525K9SA00_080105$
initrd /boot/initrd-2.6.31.5-0.1-desktop .....
Now my question is will the settings of (hda0,n), change due to the fact that I have deleted the sda2? I have a lot of unused space at the end of my disk and want to create a new "sda2" there.
I decided to install the Ubuntu Netbook remix (9.10, I believe) on this extra IDE hard drive I had (my other three hard drives are SATA.) My primary hard drive contains a Windows XP, my second contains Windows 7, and my third SATA drive is just NTFS-formatted storage. I went through the installer and choose to format and install on my 40GB IDE hard drive, which it did. Then it finished and rebooted. It apparently decided to install the GRUB bootloader onto the primary hard drive (not the one it was installed on,) which was not my intention. The bootloader froze the boot of my computer and wouldn't work. (Stuck at loading GRUB.) I couldn't even get to the BIOS. So I pulled the plug on the primary hard drive and tried to boot again. I could get into Windows 7 just fine, but that was it. The problem, though, is that the CD drive (also SATA) no longer shows up in My Computer. Also, after changing the boot order and replugging in the former primary hard drive, it wouldn't show up, either. Nor would the IDE one (though I'm pretty sure that's because Windows doesn't understand the EXT (or whatever Ubuntu uses) file system.
Does anyone know why this occurred and how to get those drives to show up in Windows again? I don't really care to get the netbook remix working here, since this isn't even a laptop, it was just an experiment. Also, I'd love to know how to remove GRUB from my primary hard disk so that I can boot from it again.
I am trying to use Tiny Core as the OS for a fairly old embedded device using a Pentium 100 with 64MB Ram.
I managed to get the Tiny Core image loaded onto a 128MB CF card. When I turn the box on, it presents me the Grup screen and I can select the bootup option (tinycore). However, soon after I am getting a DMA Timeout Error.
Also in this link: http://www.linuxquestions.org/questi...ble-it-734489/
Now, I am not familiar with Tiny Core all that well, and neither am I sure of how to modify the initramfs to include: hdparm -d0 /dev/hdb.
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?
probably did something stupid.. just haven't figured out what yet.. hope someone can point me in the right direction. daughters computer broke, maybe virus, so i did clean reinstall of xp. decided to give her a couple of linux distros, thinking maybe they are safer for when she is surfing..
Used gparted to repartition hd:
Partition table entries are not in disk order
Installed Ubuntu 8.04. was then able to boot into either ubuntu or xp. next installed fedora 10. new menu.lst did not show ubuntu, only fedora and xp. had some lockups in fedora, and had to pull plug to reboot 2 or 3 times. replaced power supply. added ubuntu into menu.lst. boots into fedora and ubuntu fine. tried to boot xp, and get "Preparing System Recovery Option", then PC Angel appears, and it wants me to use the system restore option for xp.
Is there something i can do to recover xp without having to wipe the hd and reinstall xp, then reinstall ubuntu and fedora (and if i do all that, how can i be sure i don't end up with the same problem?
I want to set up a web server, and I want to set up NTP so to always keep the clock in sync. I have installed a very basic system (No GUI or X components), to keep it slim and thereby a little less prone to security problems. However, does anybody know what the Synchronize system clock before starting option in system-config-date actually does in terms of changing config files or permissions? I'd like to know so I can do it manually via the commandline.
View 8 Replies View RelatedI'm trying to install Fedora onto a computer that has Windows XP on the first of two SATA drives. Windows 7 is on the second drive.
I installed Fedora no problems on a 14 gig free space I created on the first drive and told it where and what my other OS's were. Fine so far. I didn't tell it to overwrite the MBR on the XP (first) drive. I took the second option which I "think" put the boot loader on the fedora partition.
All good - till I rebooted and I just saw my Windows 7 loader with my options for XP and Windows 7 but no Fedora.
So, if I overwrite the MBR on the first drive, will that mean I can't access my Windows 7 installation?
How SHOULD I set up the boot loader?
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?
View 14 Replies View RelatedI have windows XP with my system, I downloaded Fedora 13 X86.iso image from bit torrent.also GPG keys in this image are 0 byte size. I burned it drectly to DVD. but sytem is not booting directly from DVD even though i changed bootup setup priority to DVD.
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