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I've run that test, hyperthreading on or off, on my P4 3.6G. It makes no difference....
Perhaps with tiny databases that could fit into the cache memory it might make a difference. In my test using ~2500 stocks, no disk accesses, the speed appears to be limited by memory access times to main memory.
Sid
b <b519b@xxxxxxxxx> wrote:
My test P4 was a non- Hyperthread model (516J or 519J, I
can remember which).
I would expect a P4 with HyperThreading turned ON to be
about 1/2 the speed.
My understanding is that unless an application is optimized
for HyperTreading, the application will run at half speed
since Windows will assign that application to 1 of the 2
virtual CPU cores that exist when HyperThreading is ON.
The advantage of the 2 virtual CPU cores is that a single
application can not "hog" all the CPU cycles. Thus a
HyperThread CPU is appears to be a lot more responsive to
the user when running multiple applications (at the cost of
doing individual jobs at half speed).
So my guess would be that a P4 (2.93 MHz) with
HyperTreading would take twice as long to run my AB test
code. That would mean it would be 30% slower than my four
year old
Athlon 1.4 GHz computer.
b
--- Mark Keitel <mkeitel@xxxxxxxxxxxxxxx> wrote:
> Curious if you used a Hyperthread P4 on how it would
> compare in that test
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