CentOS 5 :: How To Find The Booting CPU In A Multi Processor

Jun 4, 2010

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

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General :: Determine If A Multi-processor Machine Is Overloaded?

Jun 29, 2011

What is the best way to determine in Linux if a multi-processor machine is overloaded? I thought load was a good measure but I run a large number of tasks which don't consume a lot of CPU but which drive up the load. A 4 processor machine has a load of 66 right now according to top for example but mpstat reports that the all CPU idle time is 89%.

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General :: Access CRx Registers On A Multi Core Processor

Sep 9, 2011

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.

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Software :: Get Maximum Performance On A Multi-processor Machine?

Jun 30, 2011

I have a multi-threaded app using pThreads that runs great under Windows on my 4 core machine - all four cores get maxed out processing parts of a large file. I recompiled the same code to run on Red Hat linux on a 64 CPU machine - but from I can tell when it runs - it gets stuck on one core. "mpstat -P ALL" shows the cores are barely loaded. I have tried sched_affinity, sched_priority and SCHED_FIFO - nothing has helped. Any ideas on getting more performance?

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Programming :: Perl Child Processes Become Zombie On A Multi-core Processor?

Apr 11, 2011

I 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]...

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CentOS 5 :: Xen VM - Multi Core CPU VS Multi CPUs?

Sep 12, 2011

Im 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]........

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Ubuntu Installation :: Dual Booting Possible With P6100 Processor?

May 16, 2011

I know the pentium dual core p6100 processor does not support virtualization. Does it means I cant install ubuntu via wubi ?

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Ubuntu :: Using Virtual Box Compatible With Multi-booting?

May 19, 2011

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?

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Fedora :: Option For Multi-core Booting In System?

Sep 14, 2009

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?

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General :: Multi-booting, Can't Boot Windows 7 Anymore?

Aug 2, 2011

I 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?

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Ubuntu Installation :: Properly Multi-booting Grub With Windows First

Mar 5, 2010

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?

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Ubuntu Installation :: Multi Booting On Two Drives - How To Edit Grub

Apr 7, 2010

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.

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OpenSUSE Install :: Deleting SDA Partition On Multi OS Disk And Grub Booting?

Mar 17, 2011

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.

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Ubuntu Installation :: Multi-Booting - CD Drive - Also SATA - No Longer Shows Up

Apr 16, 2010

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.

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CentOS 5 Server :: Configure ISO's For PXE Booting - Pick An Iso From The List It Says "Could Not Find Ramdisk Image"?

May 3, 2011

I have a fresh install of COS5.6 installed a test laptop. I have following instructions to set up the PXE server based on the following: http:[url]......The base PXE installation seems to work fine (The menu labeled CentOS 5.6 works fine ). The whole purpose of this was to be able to boot iso's like Hirens and Imaging software ISO's.The issue is that whenever i try to pick an iso from the list it just says "Could not find ramdisk image:" [path to iso][path to iso] being either of the two iso i had set up to test this.

I would like to think that i made a typo but i can find one. The files i used are from the source of syslinux v4.0.4.The following information should be pertinent
Contents of /tftpboot/pxelinux.0/default[code].....

I have a limited experice with linux in an enterprise environment and looking for any direction as to what to do about this.

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Ubuntu Networking :: Find Which Application Is On Computer Processor?

Mar 5, 2011

I have been trying to download different applications and some of them have two options i386 or amd64. How do I find which application it is on my computer processor?mk631219

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Ubuntu Installation :: Can't Find Recommended Processor Specs Anywhere Other Than Wikipedia?

Jan 11, 2011

I have an old Pentium III 600mHz 512mb RAM pc currently running XP & would like to try to resurrect it as a usable pc running Ubuntu or a variant.After trying the main website & despite searching the forums (although not every page of the 3k that turned up), I can't find recommended processor specs anywhere other than Wikipedia.

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Programming :: Multi-line Find - Replace With GnuWin32 Sed?

Apr 26, 2009

I would like to have a script that will do a search in an XML file for a specific block of XML code and replace it with a different block of XML code using the Windows build of GNU Sed 4.1.5.

Here's the text I want to find:

Code:

And here's what I want to replace it with:

Code:

There is however a lot of stuff in there that would mess up sed, and the one example from the sed FAQ (from the Sourceforge site) that looked promising and easy enough to figure out (4.23.3. Try to use a block of "literal strings") fails with this error message: sed: file blockrep.sed line 18: unterminated `s' command

Anyone got any ideas, or even an alternate program that can do this? (Preferably one that I can automate.)

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Software :: AMD Processor Fedora Doesnt Support AMD Processor?

Jan 5, 2010

i have installed ubuntu in my laptop.since i have AMD processor fedora doesnt support AMD processor..the recent version fedora 12 supprots AMD processor.i am doing my final project in ns2 hence it should support tht too!!! Which is the best choice to override ubuntu grub fedora 12 or redhat linux.

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CentOS 5 Hardware :: Boot Hangs With E1200 Processor?

Mar 28, 2009

System has a boot partition on raid1. The root filesystem is on RAID1/LVM.During the boot process, it gets to here:

Intel machine check architecture supported.
Intel machine check reporting enabled on CPU#1.
CPU1: Intel(R) Celeron(R) CPU E1200 @ 1.60GHz stepping 0d

[code]...

most of the time, it will not reboot. I can cycle power, and, eventually, it does boot. So, hardware issue perhaps? Something else?What can I do, or add to the configuration to help debug this and figure out why? For boot options, I have tried noapic, apm=off, noht, nomce, nousb, nousbstorage, and none of those helped. As the machine is remote, to mess with console stuff, I have to get a KVM over IP hooked up, which I can do.

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CentOS 5 :: RHEL Requires An I686 Compatible Processor?

Dec 11, 2010

I have a small AMD Geode LX 800 (500 MHz) based Nettop that I would like to use at home as home server managing printers, a central data storage, and some other things. Only I can't install CentOS 5.5 due to an Anaconda exception at the very end of the initial setup process, right before it's supposed to start copying the files.Is it true that CentOS/RHEL requires an i686 compatible processor? As far as I know the Geode LX is only i586 and Redhat's system requirements only list x86 as necessary.

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CentOS 5 :: # Cat /proc/cpuinfo - Doesn't Show All Cores Of Processor

Nov 21, 2009

I have just bought new PC (Intel mother board "Intel DP43TF ATX" and Processor "Intel Core 2 Quad Q9550"). and I have installed centos 5.3 32 bit.

NOTE: All cores are enabled in BIOS.

When I issue below command, it shows only one core (not 4 cores): what could be reason!

# cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 23

[Code].....

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Hardware :: ATI Multi Card Multi Display Xinerama Composite

Jun 24, 2011

I have an ATI Radeon HD 3300 on-board video chipset, and an ATI Radeon HD 4350 PCI card. What I want is to have both displays available from one mouse/keyboard. I want to play media on one and have the other as my main desktop.The problem is that with Xinerama enabled, KDE desktop effects do not work (KDE says XComposite and XDamage are not available, even though I explicitly enabled them as extensions in the xorg.conf file), and performance is quite bad. Without Xinerama enabled, performance is great, desktop effects work great, but there's a lot of trouble with full-screen video, and the KWin window manager does not apply in the second display (although I can run a second instance of KWin on :0.1).

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Debian :: Using VNC In A Multi-user / Multi-system Network

Mar 21, 2011

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.

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CentOS 5 Networking :: DHCP Multi-Subnet From Single Server?

Oct 24, 2010

I've got a bit of a question. My network is laid out like this:

The role assignments are thus:

Firewall - sorts out the passing through to the 3 different networks, and acts as the traffic proxy.
Windows 2003 server - Does Active Directory and DNS
CentOS server - FTP and DHCP

Now, my problem is I need the CentOS server to be able to assign IP address to both networks, however, the CentOS server can *ONLY* be connected via the one interface to the firewall. It needs to assign the Windows 2003 server and the eth0 of the firewall an IP address via static DHCP, but it also needs to able to assign the clients dynamically via any address in the 10.23.1.0/24 range. I was thinking that I would be able to create static only assignments for the servers via their MAC addresses, and only have 1 dynamically assignable entry for the clients, and then get the firewall to allow ports 67 and 68 to flow freely between eth0 and eth1, but I wasn't entirely sure of the best way to do all this.

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CentOS 5 Networking :: Load Balancing Multi WAN On Squid Proxy Server?

Aug 12, 2009

How To: Load Balancing & Failover With Dual/ Multi WAN on Linux proxy server I have 3 WANs connection (2 ADSL and 1 Wimax). And 30 clients on LAN.

eth0 connect with Wimax
ip= 172.23.x.x
eth1 connect with ADSL1
ip=10.10.6.x
eth2 connect with ADSL2
ip= 10.10.5.x
eth3 connect with LAN
ip=192.168.1.x

how to do Load Balancing & Failover With Dual/ Multi WAN on Linux proxy server.

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Ubuntu :: Multi Pointer Instead Of Multi Touch?

Sep 17, 2010

Now that Ubuntu 10.04 has multi-touch capabilities built-in, if I do not have a multi-touch screen or surface device, can I get 2 USB mice and get 2 pointers on the screen? One for the right hand and one for the left hand as I am ambidextrous, and would find it very convenient to have 2 mice.

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CentOS 5 :: Booting CentOS V5.2 Fails With GRUB Error 13: Invalid Executable Format?

May 5, 2009

I'm trying to install a dual booting machine with OpenSUSE v11.1 32bit and CentOS v5.2 64bit. I installed OpenSUSE first and allowed it to install and configure grub in the MBR and after that I wanted to proceed with CentOS v5.2. The installation went fine with two notable exceptions:- when I had to configure grub installation parameters, CentOS offered me only 2 solutions: either install it on the MBR of the first hard disk or not installing it at all. Other distributions are more flexible allowing you to install it in the boot sector of the root partition for example. Because I didn't want to ruin the existent grub onfiguration, I reluctantly accepted not to install it for CentOS assuming that I could manually configure the entry later in grub's menu.lst file.

- when I was presented with the options for software components installation, I've clicked on virtualization category/function because I intend to use the machine as a VMware host. There was no guidance on screen at that point and I blindly assumed that by choosing the virtualization function I would get necessary tools and drivers that will help me further on. It seems that this was a wrong move as you can see it below.

After completing the installation, I tried to search for a template or guiding on how the menu entry in menu.lst should look like but the grub directory was empty, not surprisingly because I've told CentOS earlier not to install it. Using the files in the /boot directory from the CentOS installation I tried to improvise a menu entry but it's not working. The boot stops with famous Error 13: Invalid or unsupported executable format. Using the file command to check what kind of files I'm trying to load as kernels I'm getting :

marte:~ # file /mnt/vmlinuz-2.6.18-92.el5xen
/mnt/vmlinuz-2.6.18-92.el5xen: gzip compressed data, from Unix, last modified: Tue Jun 10 19:20:51 2008, max compression

[code]....

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CentOS 5 :: Resizing CentOS Boot Partition, Dual-booting?

Jun 9, 2009

I have a laptop that came with Windows Vista (64-bit) installed. I created a new partition and installed XP (also 64-bit) alongside it.Last night I shrunk my XP partition and created another new partition and installed Linux (CentOS 64-bit) on it. I made an error in judgment and didn't allocate enough space, so I need about 10 more gigs for the Linux partition. It boots up and runs, but I need about 10 more gigs of storage for the files I want to keep on the partition (and yes, they have to be on the partition, I definitely need to know how to do this, not a workaround)I went into Vista and shrunk the XP partition by 10 gigs, so now I have 10 gigs of free, non-partitioned space.

As it stands, when I start up the computer I get the GRUB boot loader. I can boot my Linux install or choose "Other" and be taken to the Vista boot loader. From there I can choose XP or Vista to boot.So, my question is... what is the best way to append the 10 gigs of free space to the Linux partition? Is this something I should do inside of Linux? I have the option to do it in Vista, but the partition shows up as "healthy" but without a file system type.I just don't want to screw up the boot loader, partitions or anything else.This isn't my area of expertise, so if anyone could give me a good suggestion or solid answer

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Red Hat :: Booting Centos 5.4 - CentOS CD Not Found In Any Of The Media Drives

Apr 7, 2010

Since RHEL is similar to CentOS posting it here.

Upon booting from DVD, i get the below error: "CentOS CD Not found in any of the media drives. Please insert CentOS CD and press OK."

I have IDE Sony DVD RW AW-G170.

BIOS Setting:

Downloaded the CentOS-5.4-i386-bin-DVD image from centos.org from DVD.torrent using bittorrent file.
When booting from the DVD, it gives me the boot prompt:

Upon pressing enter, the log messages of the boot detect the media drive as: hdc: Sony DVD RW AW-G170 IDE ATAPI CD.

The below steps occur:
1) Select the keyboard type: selected us

2) Select the Language : selected us

3) Select the image:
- Local CDROM
- Hard Drive
- NFS Image
...
...
selected Local CDROM

Then the above error "CentOS CD Not found in any of the media drives. Please insert CentOS CD and press OK."

The booting steps does not ask the for media check step.

The below methods have been tried to solve the problem:

- Burnt the image in another 2 DVDs but the same error "CentOS CD Not found in any of the media drives. Please insert CentOS CD and press OK."

- Upon burning the DVD image , selected the DVD read speed: 8x. Upon burning the DVD selected 18x for burning. and then tried to boot with that DVD

- At the boot prompt entered : linux hdc=cdrom replaced hdc=hdb but the error remains.

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