 | | | Is the system SMP capable? | Is the system SMP capable? 2006-08-25 - By Dag Wieers
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On Fri, 25 Aug 2006, Ben Spencer wrote:
> Is there a way to determine if the OS will take advantage of additional
> CPUs if one was installed without having the kernel config file and
> nothing apparent being displayed at boot/via uname? We don't want to buy
> additional CPUs for the box and find out the OS will not support them.
>
> Is there any performance gain from 2 CPUs when the OS isn't SMP enabled?
If the question is: do I have more than one CPU ?
Then the answer is hidden in the dmidecode output.
dmidecode | grep -B1 -E '^\s+(Socket Designation: Proc |Status: )'
If you're not sure if all the processors are being used by the OS, you can
compare this output to what /proc/cpuinfo has to say.
grep -E '(^processor|^model name)' /proc/cpuinfo
Beware though that dmidecode counts physical processors (or sockets) and
/proc/cpuinfo counts logical processors (like when hyperthreading is
enabled). For both you need an SMP-aware kernel if you have more than one.
Kind regards,
-- dag wieers, dag@(protected), http://dag.wieers.com/ --
[all I want is a warm bed and a kind word and unlimited power]
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