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authorNick Piggin <nickpiggin@yahoo.com.au>2005-11-07 00:59:53 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2005-11-07 07:53:43 -0800
commitf5b3db0017f8415301f3427b30263186e8478c3f (patch)
tree04e6307bd4052f61ce68cd30af78d0c3382322ae /include/linux/ipmi.h
parentbefc649c2274a1c35f0cd1e888dd83652cbb0422 (diff)
[PATCH] as: cooperating processes
Introduce the notion of cooperating processes (those that submit requests close to one another), and use these statistics to make better choices about whether or not to do anticipatory waiting. Help and analysis from Seetharami Seelam <seelam@cs.utep.edu> Performance testing from Seelam: I set up my system and executed a couple of tests that I used for OLS. I tested with AS, cooperative process patch merged in -mm tree (which I called Nick, below) and the cooperative patch with modifications to as_update_iohist (which I called Seelam). I used a dual-processor (2.28GHz Pentium 4 Xeon) system, with 1 GB main memory and 1 MB L2 cache, running Linux 2.6.9. Only a single processor is used for the experiments. I used 7.2K RPM Maxtor 10GB drive configured with ext2 file system. Experiment 1 (ex1) consists of reading one Linux source trees using find . -type f -exec cat '{}' ';' > /dev/null. Experiment 2 (ex2) consists of reading two disjoint Linux source trees using find . -type f -exec cat '{}' ';' > /dev/null. Experiment 3 (ex3) consists of streaming read of a 2GB file in the background and 1 instance of the chunk reads in Experiment 1. Timings for reading the Linux source are shown below: AS Nick Seelam ex1: 0m25.813s 0m27.859s 0m27.640s ex2: 1m11.468s 1m13.918s 1m5.869s ex3: 81m44.352s 10m38.572s 6m47.994s The difference between the numbers in Experiment 3 must be due to the code in as_update_iohist. (akpm: that's not part of this patch. So this patch is "Nick"). Signed-off-by: Nick Piggin <npiggin@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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