[CentOS] CentOS 4 and Intel P4 without Hyper-Threading vs. IntelP4 with Hyper-Threading
Paul Heinlein
heinlein at madboa.com
Wed Apr 20 16:21:43 UTC 2005
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.
--
Paul Heinlein <> heinlein at madboa.com <> www.madboa.com
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