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SubjectRe: [PATCH] sched, fair: Allow a small degree of load imbalance between SD_NUMA domains v2
Hi Mel,

* Mel Gorman <mgorman@techsingularity.net> [2019-12-20 08:42:52]:

> Changelog since V1
> o Alter code flow vincent.guittot
> o Use idle CPUs for comparison instead of sum_nr_running vincent.guittot
> o Note that the division is still in place. Without it and taking
> imbalance_adj into account before the cutoff, two NUMA domains
> do not converage as being equally balanced when the number of
> busy tasks equals the size of one domain (50% of the sum).
> Some data is in the changelog.

I still plan to run SpecJBB on the same setup but for now I have few perf
bench test results. The setup and results are below.
We might notice that except for numa01, all other cases the system was not
fully loaded.
Summary: We seem to be regressing in all the 5 situations I tried.

lscpu o/p
Architecture: ppc64le
Byte Order: Little Endian
CPU(s): 256
On-line CPU(s) list: 0-255
Thread(s) per core: 8
Core(s) per socket: 1
Socket(s): 32
NUMA node(s): 8
Model: 2.1 (pvr 004b 0201)
Model name: POWER8 (architected), altivec supported
Hypervisor vendor: pHyp
Virtualization type: para
L1d cache: 64K
L1i cache: 32K
L2 cache: 512K
L3 cache: 8192K
NUMA node0 CPU(s): 0-31
NUMA node1 CPU(s): 32-63
NUMA node2 CPU(s): 64-95
NUMA node3 CPU(s): 96-127
NUMA node4 CPU(s): 128-159
NUMA node5 CPU(s): 160-191
NUMA node6 CPU(s): 192-223
NUMA node7 CPU(s): 224-255

numa01 is a set of 2 process each running 128 threads;
each thread doing 50 loops on 3GB process shared memory operations.

numa02 is a single process with 32 threads;
each thread doing 800 loops on 32MB thread local memory operations.

numa03 is a single process with 32 threads;
each thread doing 50 loops on 3GB process shared memory operations.

numa04 is a set of 8 process (as many nodes) each running 4 threads;
each thread doing 50 loops on 3GB process shared memory operations.

numa05 is a set of 16 process (twice as many nodes) each running 2 threads;
each thread doing 50 loops on 3GB process shared memory operations.

(Since we are measuring duration in seconds, lower is better;
-ve %Change would mean duration has increased)

v5.5-rc2
Testcase Time: Min Max Avg StdDev
numa01.sh Real: 479.46 501.07 490.26 10.80
numa01.sh Sys: 79.74 128.24 103.99 24.25
numa01.sh User: 118577.01 121002.82 119789.92 1212.90
numa02.sh Real: 12.53 14.80 13.66 1.14
numa02.sh Sys: 0.89 1.49 1.19 0.30
numa02.sh User: 318.74 354.86 336.80 18.06
numa03.sh Real: 80.19 83.64 81.91 1.73
numa03.sh Sys: 3.87 3.91 3.89 0.02
numa03.sh User: 2501.34 2574.68 2538.01 36.67
numa04.sh Real: 59.62 65.79 62.70 3.09
numa04.sh Sys: 26.99 29.36 28.17 1.19
numa04.sh User: 1637.57 1657.55 1647.56 9.99
numa05.sh Real: 58.03 60.54 59.28 1.26
numa05.sh Sys: 66.01 66.48 66.25 0.24
numa05.sh User: 1522.61 1526.41 1524.51 1.90

v5.5-rc2 + patch
Testcase Time: Min Max Avg StdDev %Change
numa01.sh Real: 518.80 526.75 522.77 3.97 -6.2188%
numa01.sh Sys: 133.63 154.35 143.99 10.36 -27.7797%
numa01.sh User: 123964.16 127670.38 125817.27 1853.11 -4.79056%
numa02.sh Real: 23.70 24.58 24.14 0.44 -43.4134%
numa02.sh Sys: 1.66 1.99 1.82 0.17 -34.6154%
numa02.sh User: 525.45 550.45 537.95 12.50 -37.392%
numa03.sh Real: 111.58 139.86 125.72 14.14 -34.8473%
numa03.sh Sys: 4.32 4.34 4.33 0.01 -10.1617%
numa03.sh User: 2837.44 3581.76 3209.60 372.16 -20.9244%
numa04.sh Real: 102.01 110.14 106.08 4.06 -40.8937%
numa04.sh Sys: 41.62 41.63 41.62 0.01 -32.3162%
numa04.sh User: 2402.66 2465.31 2433.98 31.33 -32.31%
numa05.sh Real: 97.96 109.59 103.78 5.81 -42.8792%
numa05.sh Sys: 76.57 84.83 80.70 4.13 -17.9058%
numa05.sh User: 2196.67 2689.63 2443.15 246.48 -37.6006%

vmstat counters

+ve %Change would mean hits have increased)
vmstat counters for numa01
param v5.5-rc2 with_patch %Change
----- ---------- ---------- -------
numa_hint_faults 2075794 2162993 4.20075%
numa_hint_faults_local 363105 393400 8.34332%
numa_hit 1333086 1190972 -10.6605%
numa_local 1332945 1190789 -10.6648%
numa_other 141 183 29.7872%
numa_pages_migrated 303268 316709 4.43205%
numa_pte_updates 2076930 2164327 4.20799%
pgfault 4773768 4378411 -8.28186%
pgmajfault 288 266 -7.63889%
pgmigrate_success 303268 316709 4.43205%

vmstat counters for numa02
param v5.5-rc2 with_patch %Change
----- ---------- ---------- -------
numa_hint_faults 61234 90455 47.7202%
numa_hint_faults_local 31024 69953 125.48%
numa_hit 78931 68528 -13.1799%
numa_local 78931 68528 -13.1799%
numa_pages_migrated 30005 20281 -32.4079%
numa_pte_updates 63694 92503 45.2303%
pgfault 139196 161149 15.7713%
pgmajfault 65 70 7.69231%
pgmigrate_success 30005 20281 -32.4079%

vmstat counters for numa03
param v5.5-rc2 with_patch %Change
----- ---------- ---------- -------
numa_hint_faults 692956 799162 15.3265%
numa_hint_faults_local 95121 167989 76.6056%
numa_hit 256729 223528 -12.9323%
numa_local 256729 223528 -12.9323%
numa_pages_migrated 106499 116825 9.69587%
numa_pte_updates 693020 803373 15.9235%
pgfault 1003178 1004960 0.177635%
pgmajfault 84 79 -5.95238%
pgmigrate_success 106499 116825 9.69587%

vmstat counters for numa04
param v5.5-rc2 with_patch %Change
----- ---------- ---------- -------
numa_hint_faults 4766686 5512065 15.6373%
numa_hint_faults_local 2574830 3040466 18.0841%
numa_hit 1797339 1975390 9.90637%
numa_local 1797330 1975357 9.90508%
numa_pages_migrated 958674 1144133 19.3454%
numa_pte_updates 4784502 5533075 15.6458%
pgfault 5855953 6546520 11.7926%
pgmajfault 124 118 -4.83871%
pgmigrate_success 958674 1144133 19.3454%

vmstat counters for numa05
param v5.5-rc2 with_patch %Change
----- ---------- ---------- -------
numa_hint_faults 11252825 10988104 -2.35248%
numa_hint_faults_local 7379141 8290124 12.3454%
numa_hit 3669519 2964756 -19.2059%
numa_local 3669518 2964702 -19.2073%
numa_pages_migrated 2050570 1696810 -17.2518%
numa_pte_updates 11326394 11003544 -2.85042%
pgfault 13059535 12747105 -2.39235%
pgmajfault 83 433 421.687%
pgmigrate_success 2050570 1696810 -17.2518%

--
Thanks and Regards
Srikar Dronamraju

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