Messages in this thread |  | | Date | Thu, 16 Jan 2003 10:27:23 -0800 | From | "Martin J. Bligh" <> | Subject | [PATCH] (0/3) NUMA aware scheduler |
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Following is a sequence of patches to add NUMA awareness to the scheduler. These have been submitted to you several times before, but in my opinion were structured in such a way to make them too invasive to non-NUMA machines. I propsed a new scheme of working in "concentric circles" which this set follows (Erich did most of the hard work of restructuring), and is now completely non-invasive to non-NUMA systems. It has no effect whatsoever on standard machines. This can be seen by code inspection, and has been checked by benchmarking.
These patches are the culmination of work by Erich Focht, Michael Hohnbaum and myself. We've also incorporated feedback from Christoph and Robert Love. I believe these are now ready for mainline acceptance. I've tested them on NUMA-Q, standard SMP and UP. Erich has run them on the NEC ia64 NUMA machine.
Benchmarks on a 16-way NUMA-Q machine w/ 16Gb of RAM
Kernbench: (average of 5 kernel compiles) Elapsed User System CPU 2.5.58 20.012s 191.81s 48.37s 1200.6% 2.5.58-numasched 19.57s 187.264s 42.186s 1171.8%
NUMA schedbench 64: (64 processes running memory allocation fairly heavily) Elapsed TotalUser TotalSys 2.5.48 608.81 9418.37 26.74 2.5.58-numasched 230.49 3613.47 15.57
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