[RC5] Does Intel hyperthreading help?
Décio Luiz Gazzoni Filho
decio at revistapcs.com.br
Mon Aug 18 19:11:57 EDT 2003
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On Monday 18 August 2003 14:52, Jim Reisert AD1C wrote:
> Do either the OGR or RC5 clients gain any benefit from the hyperthreading
> architecture of the newer P4s? I'm about to upgrade from a 1.67 GHz P4 to a
> 3.0 GHz P4 with HT. Was wondering if I'll see much less than than 2x,
> close to 2x or more than 2x performance improvement on RC5/OGR tasks.
Less than 2x performance improvement, as far as RC5 goes (I'll restrict myself
to RC5 since that's what I'm familiar with). The RC5 core is completely
CPU-bound and as such doesn't benefit from HT. Actually you'll see a decrease
in performance if you happen to force 2 threads to run, since the threads
will fight over shared resources.
Keep in mind that HT was made for I/O-bound, not CPU-bound situations.
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