Messages in this thread | | | Date | Mon, 17 Sep 2007 05:21:42 -0400 | From | "Rob Hussey" <> | Subject | Scheduler benchmarks - a follow-up |
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Hi all,
After posting some benchmarks involving cfs (http://lkml.org/lkml/2007/9/13/385), I got some feedback, so I decided to do a follow-up that'll hopefully fill in the gaps many people wanted to see filled.
This time around I've done the benchmarks against 2.6.21, 2.6.22-ck1, and 2.6.23-rc6-cfs-devel (latest git as of 12 hours ago). All three .configs are attached. The benchmarks consist of lat_ctx and hackbench, both with a growing number of processes, as well as pipe-test. All benchmarks were also run bound to a single core.
Since this time there are hundreds of lines of data, I'll post a reasonable amount here and attach the data files. There are graphs again this time, which I'll post links to as well as attach.
I'll start with some selected numbers, which are preceded by the command used for the benchmark.
for((i=2; i < 201; i++)); do lat_ctx -s 0 $i; done: (the left most column is the number of processes ($i))
2.6.21 2.6.22-ck1 2.6.23-rc6-cfs-devel
15 5.88 4.85 5.14 16 5.80 4.77 4.76 17 5.91 4.84 4.92 18 5.79 4.86 4.83 19 5.89 4.94 4.93 20 5.78 4.81 5.13 21 5.88 5.02 4.94 22 5.79 4.79 4.84 23 5.93 4.86 5.05 24 5.73 4.76 4.90 25 6.00 4.94 5.19
for((i=1; i < 100; i++)); do hackbench $i; done:
2.6.21 2.6.22-ck1 2.6.23-rc6-cfs-devel
80 9.75 8.95 9.52 81 11.54 8.87 9.57 82 11.29 8.92 9.67 83 10.76 8.96 9.82 84 12.04 9.20 9.91 85 11.74 9.39 10.09 86 12.01 9.37 10.18 87 11.39 9.43 10.13 88 12.48 9.60 10.38 89 11.85 9.77 10.52 90 13.78 9.76 10.65
pipe-test: (the left most column is the run #)
2.6.21 2.6.22-ck1 2.6.23-rc6-cfs-devel
1 13.84 12.59 13.01 2 13.90 12.57 13.00 3 13.84 12.62 13.06 4 13.87 12.61 13.04 5 13.82 12.62 13.03 6 13.86 12.60 13.02 7 13.85 12.61 13.02 8 13.88 12.45 13.04 9 13.83 12.46 13.03 10 13.88 12.46 13.03
Bound to Single core:
for((i=2; i < 201; i++)); do lat_ctx -s 0 $i; done:
2.6.21 2.6.22-ck1 2.6.23-rc6-cfs-devel
15 2.90 2.76 2.21 16 2.88 2.79 2.36 17 2.87 2.77 2.52 18 2.86 2.78 2.66 19 2.89 2.72 2.81 20 2.87 2.72 2.95 21 2.86 2.69 3.10 22 2.88 2.72 3.26 23 2.86 2.71 3.39 24 2.84 2.72 3.56 25 2.82 2.73 3.72
for((i=1; i < 100; i++)); do hackbench $i; done:
2.6.21 2.6.22-ck1 2.6.23-rc6-cfs-devel
80 14.29 10.86 12.03 81 14.40 11.25 12.17 82 15.00 11.42 12.33 83 14.87 11.12 12.51 84 15.37 11.42 12.66 85 15.75 11.68 12.79 86 15.64 11.95 12.95 87 15.80 11.64 13.12 88 15.70 11.91 13.25 89 15.10 12.19 13.42 90 16.24 12.53 13.54
pipe-test:
2.6.21 2.6.22-ck1 2.6.23-rc6-cfs-devel
1 9.27 8.50 8.55 2 9.27 8.47 8.55 3 9.28 8.47 8.54 4 9.28 8.48 8.54 5 9.28 8.48 8.54 6 9.29 8.46 8.54 7 9.28 8.47 8.55 8 9.29 8.47 8.55 9 9.29 8.45 8.54 10 9.28 8.46 8.54
Links to the graphs (the .dat files are in the same directory): http://www.healthcarelinen.com/misc/benchmarks/lat_ctx_benchmark2.png http://www.healthcarelinen.com/misc/benchmarks/hackbench_benchmark2.png http://www.healthcarelinen.com/misc/benchmarks/pipe-test_benchmark2.png http://www.healthcarelinen.com/misc/benchmarks/BOUND_lat_ctx_benchmark2.png http://www.healthcarelinen.com/misc/benchmarks/BOUND_hackbench_benchmark2.png http://www.healthcarelinen.com/misc/benchmarks/BOUND_pipe-test_benchmark2.png
The only analysis I'll offer is that both sd and cfs are improvements, and I'm glad that there is a lot of work being done in this area of linux development. Much respect to Con Kolivas, Ingo Molnar, and Roman Zippel, as well all the others who have contributed.
Any feedback is welcome.
Regards, Rob [unhandled content-type:image/png][unhandled content-type:image/png][unhandled content-type:image/png][unhandled content-type:image/png][unhandled content-type:image/png][unhandled content-type:image/png][unhandled content-type:application/x-bzip2][unhandled content-type:application/x-bzip2][unhandled content-type:application/x-bzip2][unhandled content-type:application/x-bzip2] | |