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Questions tagged [smp]

Symmetric multiprocessing (SMP)

Symmetric multiprocessing (SMP) involves a symmetric multiprocessor system hardware and software architecture where two or more identical processors connect to a single, shared main memory, have full access to all I/O devices, and are controlled by a single operating system instance that treats all processors equally, reserving none for special purposes. Most multiprocessor systems today use an SMP architecture. In the case of multi-core processors, the SMP architecture applies to the cores, treating them as separate processors.

wikipedia

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VMWare ESXi and IRQ balancing

VMWare ESXi 4.1 Guest: Linux kernel 2.6.32 64bit (tried older as well) In multi-CPU virtual machine all interrupts (eth0,ata_piix) are stuck to the single CPU. When running on the pure hardware, everything is balanced ok. Tried E1000 network driver…
disserman
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24 Core Server Performance

I have a quad hexacore system based on the Opteron 8345 chips - that's 24 cores in all with 48GB of ram. This box was meant to replace the current six Intel core box which my current LAMP stack runs on. I am however getting even worse performance…
Khushil
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Should a core be "reserved" for the OS in a multi-core (SMP) Linux system?

If I plan to run eight applications on an eight core machine and expect all applications to utilise 100% cpu, will the OS "get enough time" for its own tasks or should I instead run seven applications on the machine and leave one core for the OS, so…
Henrik
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Server crashes because of SMP

My web server is crashing every few days unless I disable SMP with "nosmp" parameter in Grub config. It is not an hardware failure because the problem persists after moving everything to a new machine. Does anyone know which application could make…
Antares
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Setting default_smp_affinity on Linux to the correct value

I have 12 core boxes: egrep -c processor /proc/cpuinfo 12 cat /proc/irq/default_smp_affinity fff I would like to use all of the cores so my understanding is that the default_smp_affinity should be set to ffffffffffff. echo ffffffffffff >…
Istvan
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Alternative system fans for EOL HP ML150 G6 servers

Background I have an HP ML150 G6 server that HP made 'End Of Life'. I added a second processor to the system but then was unable to get past POST due to a missing system fan. I found a diagram that showed that the ML150 G6 required a SYSFAN1 (or…
Morten Green Hermansen
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Linux SMP Kernel Ram Utilization

I have a linux machine with Redhat 32 bit SMP Kernel installed , the ram size of machine is 16 GB and processor architecture is 64 bit. Please clarify my doubts on this setup : Can OS use the 16GB memory completely ? ( i heard that in windows os if…
Akhil Thayyil
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If SMP is disabled, does that mean I cannot use multicores? Or multiprocessors?

I've purchased a VPS for the sake of dev work, and had wished to install NetBSD under the Xen DomU guest. Unfortunately it is stated that this will work, however will not support SMP. Does this mean I cannot use the extra cores/processors that my…
Ronald H.
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ESXi performance considerations with VM that requires many CPUs

I will be looking to buy a new server soon, and would like to consolidate servers into one VM server. I will have equivalent infrastructure offset, so this isn't a case of having all my eggs in one basket. I have a Terminal Server that is running…
John X Citizen
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Enabling Hyperthreading on a Centos 7.3 server using Intel Xeon E5620

I have a Centos 7.3 server running a dual socket quad core Intel Xeon CPU E5620 @ 2.40GHz. I would like to use hyperthreading on this server but it seems it has been disabled. The spec sheet for this chip indicates it should support…
Dave Smylie
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NUMA processor definition

NUMA, non-uniform memory access designates a symetric multi-processing system where processors are grouped into nodes, with each group sharing some level of memory, so that memory access on same node is faster than memory access to another node. To…
kiriloff
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SMP kernel sees only one CPU (i7-930) with ACPI enabled

A Gentoo box running a up-to-date SMP kernel sees only one CPU eventhough ACPI is enabled in AmiBIOS. Any ideas why? > uname -a Linux charlie 3.17.7-gentoo #1 SMP Mon Jan 12 19:31:07 CET 2015 x86_64 Intel(R) Core(TM) i7 CPU 930 @ 2.80GHz…
svoop
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Server crash : "unable to handle kernel paging request"

My fresh new Ubuntu webserver randomly crashes with the following error in the syslog. It doesn't respond anymore and I have to do a hard reboot. It happens almost one time a day. Server kernel is : Linux 3.10.23-xxxx-std-ipv6-64 #1 SMP Mon Dec 9…
Antares
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linux kernel soft lock nagios

I've had this happen a few times in the past few days, anyone have any idea what might be causing this? Looks related to nagios/smp/memory management. Seems to be recurring every 24hrs or so. This is a debian 6 system with latest 2.6.32 kernel from…
Blair
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Why windows process scheduler assign tasks to random CPUs?

I am on dual core C2D processor, Windows 7 (although this behavior is the same in all MS OSes I've seen). When I run any single threaded CPU-intensive task, it does not stick to 1 core, but rather randomly occupy some 50% of first core, and some 50%…
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