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Technology Stocks : Intel Corporation (INTC)
INTC 36.20+0.1%Dec 26 9:30 AM EST
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To: Elmer who wrote (169743)8/22/2002 2:13:44 AM
From: Joe NYC  Read Replies (1) of 186894
 
Elmer,

Our tests of a hyperthreading-enabled Intel Xeon DP server showed, on average, a 45.71 percent increase in SQL transaction performance and a 31.13 percent increase in three-tier Web application performance, versus the same system with hyperthreading disabled[a P4]."

Anand is showing different results of gains (losses) from hyperthreading:

                               2.4x2   2.2x2   2.2x1 
Website Database Performance:  +4.3%   +3.7%  +12.4%
Ad Database Performance:       -3.0%   -5.5%   +1.5%
Forums Database Performance    -0.3%  +17.0%   +9.2%


Nowhere near the Infoworld numbers, and highly unpredictable, whether Hyperthreading will help or hurt.

I think only one conclusion can be drawn from the real test that I have seen: Hyperthreading helps in single processor servers processing server tasks.

In single CPU machines on client apps / games etc and in multiprocessor servers on server apps, the results are unpredictable, just as likely hurting performance as helping.

Joe
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