CentOS 5 Hardware :: Core 2 Duo - Number Of Processors
Mar 17, 2009Just installed centOS 52 x86_64 on a Core 2 Duo (E6750). From the /proc/cpuinfo I see that only one processor is detected. Any parameter on the BIOS to be changed?
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May 6, 2010I have a server with 48 cores, 8 6-way Opteron CPU's. Ubuntu Server 9.04 only sees 32 processors. Is there a limit on the number of cores/processors that the server will use? Windows 2008 on the same server sees all 48 cores and the so does the BIOS, so this is unique to Ubuntu right now.
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Feb 19, 2010In 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
CentOS 5 Hardware :: Infiniband (mlx4) Works On 16-core System But (now) Fails On 32-core System
Jan 27, 2010We 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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CentOS 5 :: No Threads In Core File On 5.3?
Jul 8, 2009I have a multi-threaded application using pthreads. On application crash or when signalling with 'kill -s 6' the core file created by the 2.6.18-128 kernel on CentOS 5.3 shows only one single thread. Core file saved with gcore in gdb shows all running threads properly so the problem is clearly in the kernel. I tested CentOS 5.2 (kernel 2.6.28-92) and it works correctly.
what's wrong with CentOS 5.3 kernels?
General :: Upgrading From Fedora Core 7 To CentOS 5.4
Jan 19, 2010I need to upgrade one of our systems from its current distribution, Fedora Core 7, to the most recent version distribution, release 5.4, of the CentOS operating system. Can I do an in-place upgrade of the operating system without any adverse side-effects? Are there any issues that I should be concerned with before proceeding?
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Oct 22, 2010I modified the following files according to all I found after googling the net:
/etc/security/limits.conf
* soft core unlimited
/etc/profile
ulimit -c unlimited[code]....
I don't get a core file when I kill -11 <pid_of_sleep>
System is centos 5.3
CentOS 5 :: VMware Server Only Detects 1 Of 2 Quad Core CPU?
Jan 22, 2010Sadly, I google'd the heck out of this and even the vmware community has no answers. So, I decided to turn to the experts and see if you can provide a better solution than [URL]. The system sees both CPU's and all of the cores (cat /proc/cpuinfo). I have tried with HT and without HT (I never run HT anymore; seems to hurt performance in my workloads). I've tried the recent and newest kernels for CentOS 5.4 and still have no luck. There seems to be lots of people having this issue, but no real solutions.
Dell PE R710 with 2x Xeon CPU X5550
kernel 2.6.18-164.11.1.el5 #1 SMP x86_64
Fresh CentOS 5.4 install
CentOS 5 Hardware :: Installing 5.4 X86_64 On Intel Core I7?
Apr 28, 2010I'm trying to setup CentOS 5.4 x86_64 on a new machine but am running into problems. The machine is: CPU: Intel Core i7-860 RAM: 4GiB DDR3 Motherboard: Intel DQ57TM When booting from the disc, I get to the initial splash screen but almost immediately after that, I get a kernel panic.
None of the lines leading up to it mean much to me so I'm not sure what to copy here but the last line says: <0>Kernel panic - not syncing: Fatal exception
CentOS 5 Hardware :: Recommend A Pre-built Core I7 Desktop?
Jun 21, 2010Can anyone recommend a pre-built Core i7 desktop on which CentOS 5 can be easily installed ? It will not be used for gaming. We are considering the Aspire M5811 and the Vostro 430, however I heard that there is an RHEL bug with the NIC on the latter.
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Nov 3, 2010I 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
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model: 4
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OpenSUSE :: Get Application To Utilize More Than One Core In Multi-core Setup?
Mar 27, 2011I 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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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.
Ubuntu :: Lucid Lynx - Dual Core - One Core Always At 100%
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Mar 14, 2011I 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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View 5 Replies View RelatedCentOS 5 Hardware :: No Throttling Scalling Speedstep On Xeon Quad-Core
Jun 30, 2009System recognizes that CPU is capable of throttling, but there is no module to govern it. So Xeon always runs at full frequency.This is not convenient as my server is not always in full use, so I would like it to lower power consumption, especially for AC, with frequency scaling enabled.Can you help me is this some bug, misconfiguration in default kernel or guys who writes kernel think that scaling is not necessary for servers processors?
From my analysis so far, I think that the issue lies with the fact that module acpi-cpufreq does not support Xeons and that there is no dedicated module for this processor family (e.g. p4-clockmod) module in the default kernel.
CentOS 5 Hardware :: X Server Black Screen During Install (core I5 GPU / Clarkdale)?
Mar 13, 2010Finally i've got my new hardware! After assembling my System there was the first shock: I'm booting from DVD (CentOS 5.4 - 64bit) and everything's fine. When Anaconda attempts to start the X-Server, my Intel Clarkdale GPU is found and then there's a black Screen. Has anybody already tried this combination? Aunt Google wasn't very helpful :- /
My Hardware:
Intel Core i5 660 (integrated GPU)
ASUS P7H55-V
4 GB OCZ RAM
4 x 1TB SATA HDD
1 x 160GB IDE HDD
CentOS 5 Hardware :: Launching X11 Sometimes Crashes Core I5 Clarkdale With Black Screen
Aug 23, 2010I am having a problem with my Core i5 system running Centos 5.5. The system will lock up with a black screen on occasion when launching X11 - this could happen at any time, from the install CD the first time it's being installed or trying a live CD, or the 3rd-10th time I launch startx from tty1 or sometimes just switching from tty1 to display0 or display1. When the crash occurs, sometimes the systems fans will all turn on loud, and the reset button becomes non-responsive. Other times the screen is black and it just sits there and I have to hard power off. There's nothing in /var/log/messages.
I tried a fix from an old post for 5.4 adding the option for "DDC" "false" in the xorg.conf file, and this did not help. I also ran all the system updates, no help.
The system is totally stable so long as I don't switch between ttys and X11 or launch new X11s (it's also stable under other OSs and has passed Memtest86+ 4).
Is this an instability with the Core i5 driver? The "Video Card" in the display options is set to "intel - Experimental modesetting driver for Intel Integrated Graphics Chipsets" - the "experimental" part is a little scary. Should I try setting the driver to "i810" as the 5.5 release notes recommends (again there's no onboard "chipset" this is an embedded graphics processor on the i5 CPU).
here's the getinfo.sh dump
--glen201
== BEGIN uname -rmi ==
2.6.18-194.11.1.el5 x86_64 x86_64
== END uname -rmi ==
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