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Technology Stocks : Advanced Micro Devices - Moderated (AMD)
AMD 217.91+0.9%Dec 5 9:30 AM EST
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To: heatsinker2 who wrote (200905)6/7/2006 1:51:05 PM
From: pgerassiRead Replies (1) of 275872
 
Dear Heatsinker2:

The two socket 2.2GHz Opteron 275 matched two socket 3GHz Woodcrest in performance. Thats a 36% better performance per clock. I'd say on a performance and a performance per watt basis, Opteron deals Woodcrest a hit on the head with a 2x4.

I suspect that many of the benchs in the DB tests have a small working set. Since the load was mostly web surfing type reads,the amount read in any given query is likely to be at most a few KB. This is not typical of DBMS loads on most servers. Typical queries bring in 200K to 2MB and the working sets are between 4-40MB per application. These benches are for a single application server. This is not typical of most enterprise servers. They are running 10-100 applications at the same time.

Third, Anandtech did find a bottleneck with mutex on Linux where MySQL pushes its use too much. If that is the major bottleneck, then a CPU having enough cache can run it much faster than what it could do without the bottleneck wrt to a smaller cache CPU. This trait fairly invalidates most of the benchmarks since a run with DB2 doubles the scaling performance and doesn't have that bottleneck.

Finally, in the SPEC area they did not use the correct 2.8GHz numbers. The 2.8GHz A64 FX-62 (Opteron 290 equivalent) got 2400+, not 2200+ for SPECfp. Using Solaris Studio 11 with auto parallel option, 2 3GHz Opteron 256s got 2700+ for SPECfp. Since HP does supply the Opteron 256 in the 585, why not compare 3GHz x 4 cores between the HP585 and the Woodcrest 5160 3GHz x 4 cores Intel box? Just some more Intel bias.

Pete
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