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Technology Stocks : Intel Corporation (INTC) -- Ignore unavailable to you. Want to Upgrade?

To: Scumbria who wrote (127688)	2/18/2001 1:01:46 AM
From: Ali Chen	Read Replies (1) \| Respond to of 186894

"Mainstream apps are not going to be compiled for P4 for a long time" Even if this may be not completely true, it may not change much. The problem with Intel's SPEC compiler is that the compile is good only for the particular (SPEC) application with the particular set of data. This is because the Intel's compiler works in two passes - first it runs the first cut of code on the data set, learns where weak places are ("profiles" the data/code), and then uses this profile to optimize the final code. On the top of this, a performance test engineer tries variety of hand-picked compiler switches to improve the run time result. Hence the compiled code is optimal only for that particular data set that was frozen by benchmark designers. If the data size/structure frequently varies as in real-world applications, the performance of double-optimized code may not be spectacular. I am afraid it is what we are seeing in most other benchmarks that use a "frozen" off-the-shelf code. Regards, - Ali