Advanced Micro Devices - Moderated (AMD) Message Board

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Technology Stocks : Advanced Micro Devices - Moderated (AMD)

AMD 213.50

+6.2%

Dec 19 3:59 PM EST

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To: jcholewa who wrote (27047)	1/31/2001 9:51:45 PM
From: bruce rogers	Read Replies (3) of 275872

> Well, the meat of the article was that a single 266 DDR 1.2GHz Athlon compiled the kernel in 4min 51secs > and the dual system compiled it in 2 min 00 secs!, more than a 100% performance improvement. > (Normally one expects somewhat < 100% performance improvement). When you see a difference like this, either the single processor version was starved for resources, or something was different between the runs. When you run gcc in parallel, it simply compiles a separate .c file in each thread, so the resource allocation problem doesn't happen - unless the guy figured out some way to disable one cpu, and still run two compile threads. I'm pretty sure what happened is that the first run all the files were on disk, and part of the compile time was disk access. Immediately after that, he timed the 2 thread version, and all the files were read out of the cache. He should have run the first benchmark twice to check for that.

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