Messages in this thread |  | | Subject | Re: 2.4.x SMP scalability question. | Date | Mon, 21 Aug 2000 21:25:21 +0100 (BST) | From | Alan Cox <> |
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> > i can show you pure user-space workloads that will not scale past 2 CPUs > > on any x86 SMP system. > > Can you point me/us to any references on the SMP scalability of various > workloads and/or how to diagnose them?
The critical one on a PC is almost always memory bandwidth. Running a tight loop on one CPU doing chained dereferences to the same cache colour (ie continually cycling lines through cache) will heavily dent performance of the whole machine. You really do have to try hard to get x86 apps on heavily smp scaled boxes running from cache
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