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In a symmetric multiprocessing (SMP) environment, multiple processors share other hardware resources, such as memory or storage. They have a single operating system. How to install or configure symmetric multiprocessing in Linux.

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what version of Ubuntu are you using? – jokerdino♦ Sep 27 '12 at 10:15
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Multiprocessor support is activated by default in the 12.04 amd64 kernel:

Multiprocessor support — also called “symmetric multiprocessing” or SMP — is available for this architecture. The standard Ubuntu 12.04 kernel image has been compiled with SMP-alternatives support. This means that the kernel will detect the number of processors (or processor cores) and will automatically deactivate SMP on uniprocessor systems. Ubuntu 12.04 Supported Hardware

Other than stated in the hardware specs the 32-bit kernel on Ubuntu should be compiled with SMP support too. In case you have another kernel you may however have to manually compile the kernel to support SMP.

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32 bit kernel has SMP enabled - it's in the kernel source common configs: debian.master/config/config.common.ubuntu - CONFIG_SMP=y – Colin Ian King Sep 27 '12 at 11:48
    
Thanks @ColinIanKing - then it may be that the entry from Ubuntu hardware specs is dated? It says "The 486 flavour of the Ubuntu kernel image packages for Intel x86 is not compiled with SMP support. " – Takkat Sep 27 '12 at 11:54
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Follow this tutorial"Linux SMP Client Installation Guide" to know how

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Please include information from the link as if the linked site were to go down, your answer would not help future users wishing to use SMP. – hexafraction Sep 27 '12 at 12:11
    
.yeah sure i've got your point of view but the problem the answer is long.Thanks – user61928 Sep 27 '12 at 12:29
    
The community frowns upon link-only answers, even if it is long. Also, the link is specific to a specific Folding@Home project, and not general SMP. can you find a link that is not project-specific? – hexafraction Sep 27 '12 at 12:35
    
@maythux You're right that you should not copy a copyrighted work, word-for-word, that is long--that would probably violate the copyright, unless you have permission or it's licensed compatibly with cc-wiki. But you can provide some information nonetheless. Please see this policy and community consensus about link-only answers, for details. – Eliah Kagan Oct 3 '12 at 1:44

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