[CentOS] CentOS 4 and Intel P4 without Hyper-Threading vs. IntelP4 with Hyper-Threading
Peter Farrow
peter at farrows.org
Wed Apr 20 16:26:36 UTC 2005
A hyper threaded processor is only a single core CPU.
Its more marketing than performance, however you might as well run an
SMP kernel on it just 'cause you can ;-)
When you upgrade to your twin Core Opterons, now that would be a good
machine to run an SMP kernel on
P.
Paul Heinlein wrote:
> On 4/20/05 9:09 AM, Aleksandar Milivojevic wrote:
>
>> BTW, do note that HT processor still has only single core. Some
>> reports indicate that there's not much advantage of HT over non-HT
>> processors (and consequently not much advantage of running SMP kernel
>> on HT processor).
>
>
> Fully realizing that the plural of "anecdote" is not "data," I can
> report that enabling HT and running an SMP kernel speeds up parallel
> make operations by 15-20%. E.g., running "make -j2" on P4/HT/SMP is
> slightly faster than "make -j2" on the same processor running a UP
> kernel. It seems like the SMP kernel is better able to keep the core
> busy than the UP kernel.
>
> Other operations, particularly day-to-day desktop stuff, seemingly
> don't benefit much at all.
>
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