Author: Gian-Carlo Pascutto
Date: 18:49:48 10/04/03
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On October 04, 2003 at 21:40:59, Tom Kerrigan wrote: >(Quick aside: very shortly after HT first came out, a patch for Linux was >released to "support" HT--the purpose was not to allow you to use the extra >logical processors (because they're transparent to the OS) but to solve exactly >the problem you mention. 2.6.x is the first kernel to have improvements in this regard, meaning that all normal Linux systems do _not_ have this optimization yet. >I assume Microsoft also made a similar fix and I don't >know which versions of Windows have it, but I am running a version of Windows >that would.) You don't know, but you do know? >Given that, HT would have to be providing a 50% speedup for my program if it >were only running on one processor, which seems unrealistically high, and that >also means my program should run 100% faster with 4 threads (vs. 2) but in >reality it only runs 15% faster. I don't get your math. -- GCP
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