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SubjectRe: [PATCH v2 02/19] sched/numa: Evaluate move once per node
On Wed, Jun 20, 2018 at 10:32:43PM +0530, Srikar Dronamraju wrote:
> task_numa_compare() helps choose the best cpu to move or swap the
> selected task. To achieve this task_numa_compare() is called for every
> cpu in the node. Currently it evaluates if the task can be moved/swapped
> for each of the cpus. However the move evaluation is mostly independent
> of the cpu. Evaluating the move logic once per node, provides scope for
> simplifying task_numa_compare().
>
> Running SPECjbb2005 on a 4 node machine and comparing bops/JVM
> JVMS LAST_PATCH WITH_PATCH %CHANGE
> 16 25705.2 25058.2 -2.51
> 1 74433 72950 -1.99
>
> Running SPECjbb2005 on a 16 node machine and comparing bops/JVM
> JVMS LAST_PATCH WITH_PATCH %CHANGE
> 8 96589.6 105930 9.670
> 1 181830 178624 -1.76
>
> (numbers from v1 based on v4.17-rc5)
> Testcase Time: Min Max Avg StdDev
> numa01.sh Real: 440.65 941.32 758.98 189.17
> numa01.sh Sys: 183.48 320.07 258.42 50.09
> numa01.sh User: 37384.65 71818.14 60302.51 13798.96
> numa02.sh Real: 61.24 65.35 62.49 1.49
> numa02.sh Sys: 16.83 24.18 21.40 2.60
> numa02.sh User: 5219.59 5356.34 5264.03 49.07
> numa03.sh Real: 822.04 912.40 873.55 37.35
> numa03.sh Sys: 118.80 140.94 132.90 7.60
> numa03.sh User: 62485.19 70025.01 67208.33 2967.10
> numa04.sh Real: 690.66 872.12 778.49 65.44
> numa04.sh Sys: 459.26 563.03 494.03 42.39
> numa04.sh User: 51116.44 70527.20 58849.44 8461.28
> numa05.sh Real: 418.37 562.28 525.77 54.27
> numa05.sh Sys: 299.45 481.00 392.49 64.27
> numa05.sh User: 34115.09 41324.02 39105.30 2627.68
>
> Testcase Time: Min Max Avg StdDev %Change
> numa01.sh Real: 516.14 892.41 739.84 151.32 2.587%
> numa01.sh Sys: 153.16 192.99 177.70 14.58 45.42%
> numa01.sh User: 39821.04 69528.92 57193.87 10989.48 5.435%
> numa02.sh Real: 60.91 62.35 61.58 0.63 1.477%
> numa02.sh Sys: 16.47 26.16 21.20 3.85 0.943%
> numa02.sh User: 5227.58 5309.61 5265.17 31.04 -0.02%
> numa03.sh Real: 739.07 917.73 795.75 64.45 9.776%
> numa03.sh Sys: 94.46 136.08 109.48 14.58 21.39%
> numa03.sh User: 57478.56 72014.09 61764.48 5343.69 8.813%
> numa04.sh Real: 442.61 715.43 530.31 96.12 46.79%
> numa04.sh Sys: 224.90 348.63 285.61 48.83 72.97%
> numa04.sh User: 35836.84 47522.47 40235.41 3985.26 46.26%
> numa05.sh Real: 386.13 489.17 434.94 43.59 20.88%
> numa05.sh Sys: 144.29 438.56 278.80 105.78 40.77%
> numa05.sh User: 33255.86 36890.82 34879.31 1641.98 12.11%
>
> Signed-off-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>

Acked-by: Mel Gorman <mgorman@techsingularity.net>

--
Mel Gorman
SUSE Labs

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