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Date: Wed, 01 Jul 2015 07:57:55 +0200
From: Daniel Wagner <wagi@...om.org>
To: Ingo Molnar <mingo@...nel.org>,
Peter Zijlstra <peterz@...radead.org>
CC: oleg@...hat.com, paulmck@...ux.vnet.ibm.com, tj@...nel.org,
mingo@...hat.com, linux-kernel@...r.kernel.org, der.herr@...r.at,
dave@...olabs.net, riel@...hat.com, viro@...IV.linux.org.uk,
torvalds@...ux-foundation.org, jlayton@...chiereds.net
Subject: Re: [RFC][PATCH 00/13] percpu rwsem -v2
Hi,
I did a sweep over the parameters for posix01. The parameters are number
of processes and number of locks taken per process. In contrast to the
other test, it looks like there is no set which ends a nice stable
result (read low variance). I have tried several things including
pinning down all processes to CPUs to avoid migration. The results
improved slightly but there was still a high variance.
Anyway I have collected some data and I like to share it. Maybe it is
still useful. All numbers here are without the above mentioned pinning.
There are some runs missing (don't know the reason yet) and I didn't let
it run till the end. So add some salt to these numbers.
The test script and raw data can be found here:
http://monom.org/posix01/
The tables reads:
nproc: number of process started
columns: number of locks taken per process
Hardware
4x E5-4610, for this test all process are scheduled on one socket
First the numbers for tip 4.1.0-02756-ge3d06bd.
nproc 8
100 200 300 400 500
count 1000.000000 1000.000000 1000.000000 1000.000000 1000.000000
mean 0.075449 0.210547 0.340658 0.464083 0.590400
std 0.015550 0.024989 0.032080 0.043803 0.055003
min 0.021643 0.067456 0.211779 0.279643 0.327628
25% 0.065337 0.195664 0.318114 0.430040 0.546488
50% 0.075345 0.209411 0.338512 0.461397 0.591433
75% 0.084725 0.226517 0.364190 0.494638 0.626532
max 0.127050 0.281836 0.454558 0.607559 0.762149
nproc 16
100 200 300 400 500
count 1000.000000 1000.000000 1000.000000 1000.000000 1000.000000
mean 1.023660 2.463384 3.891954 5.312716 6.752857
std 0.105065 0.124916 0.136476 0.172906 0.207449
min 0.351199 1.527379 3.106403 4.157478 5.519601
25% 0.961098 2.397597 3.807098 5.201875 6.633034
50% 1.031460 2.467317 3.895824 5.321227 6.757502
75% 1.093412 2.539284 3.985122 5.432336 6.889859
max 1.278603 2.785901 4.369434 5.798982 7.324263
nproc 24
100 200 300 400 500
count 1000.000000 1000.000000 1000.000000 1000.000000 1000.000000
mean 3.460166 7.942193 11.898540 11.150066 11.060036
std 0.191564 0.232989 0.612868 0.680323 0.465967
min 2.748545 6.575510 9.977165 9.209685 8.937682
25% 3.325521 7.806847 11.440580 10.774070 10.912302
50% 3.493138 7.951859 11.852556 11.163595 11.074910
75% 3.596927 8.088036 12.443429 11.365197 11.243125
max 3.974884 8.589840 13.079780 16.341043 14.244954
nproc 32
100 200 300 400 500
count 1000.000000 1000.000000 1000.000000 1000.000000 1000.000000
mean 6.797286 13.943421 14.373278 15.857103 20.047039
std 0.366013 0.417859 0.625967 0.377463 0.302939
min 3.323312 12.266006 12.492706 14.451931 17.496059
25% 6.649401 13.719397 14.186790 15.738348 19.958001
50% 6.868362 13.862458 14.312992 15.870438 20.083564
75% 6.995801 14.027167 14.429383 15.984881 20.215722
max 7.369007 15.631300 21.587450 19.364991 20.755793
nproc 40
100 200 300 400 500
count 1000.000000 1000.000000 1000.000000 1000.000000 1000.000000
mean 11.156514 16.936808 18.930412 25.605206 32.334239
std 0.613158 0.614545 0.485336 0.344226 0.398747
min 5.609261 13.147398 16.930261 23.448985 28.992899
25% 10.999876 16.740775 18.788180 25.481274 32.188020
50% 11.251502 16.883100 18.946506 25.648879 32.369347
75% 11.439205 17.032133 19.105678 25.806715 32.565019
max 12.155905 24.116348 26.152117 26.502637 33.263763
nproc 48
100 200 300 400 500
count 1000.000000 1000.000000 1000.000000 1000.000000 1000.000000
mean 16.523705 18.214558 27.877811 37.703763 47.655792
std 0.974732 1.118383 0.357481 0.435081 0.472945
min 7.909358 16.279568 25.989797 35.308061 45.279940
25% 16.385582 17.960832 27.729399 37.555420 47.458123
50% 16.692900 18.137635 27.920459 37.767064 47.679325
75% 16.927355 18.311502 28.092018 37.950782 47.926311
max 17.720374 35.810409 28.721941 38.746273 49.333097
nproc 56
100 200 300 400 500
count 1000.000000 1000.000000 1000.000000 1000.000000 1000.000000
mean 11.567668 25.100333 38.603884 52.135564 65.716669
std 0.320771 0.369833 0.554834 0.534120 0.612844
min 10.123811 22.598875 35.668780 49.182148 62.504962
25% 11.394438 24.925338 38.389200 51.885988 65.441492
50% 11.593920 25.135043 38.641839 52.206010 65.771692
75% 11.789101 25.328558 38.895343 52.451819 66.068270
max 12.319346 25.948404 46.458428 53.605888 67.270679
nproc 64
100 200 300 400 500
count 1000.000000 1000.000000 1000.000000 1000.000000 1000.000000
mean 15.421295 33.254418 51.073912 68.936111 86.919074
std 0.398493 0.411222 0.551629 0.690891 0.694183
min 13.269859 30.900978 48.174802 65.549282 83.099271
25% 15.203732 33.037478 50.821702 68.619365 86.579749
50% 15.467885 33.279869 51.130972 69.001664 86.953804
75% 15.694466 33.514712 51.380860 69.361632 87.341084
max 16.347321 34.475095 52.507292 70.884752 88.807083
nproc 72
100 200 300 400 500
count 1000.000000 1000.000000 1000.000000 1000.000000 1000.000000
mean 19.762286 42.488827 65.167763 87.903430 110.666679
std 0.483660 0.480269 0.689872 0.828354 0.892759
min 15.506067 39.937453 61.196633 84.227403 107.014850
25% 19.519194 42.261548 64.834133 87.515837 110.225142
50% 19.809986 42.541263 65.265768 87.974049 110.747980
75% 20.083315 42.792858 65.603762 88.392599 111.223192
max 20.913434 43.830009 66.791452 90.184550 113.062344
nproc 80
100 200 300 400 500
count 1000.000000 1000.000000 1000.000000 1000.000000 1000.000000
mean 24.782285 52.853068 80.902314 109.112294 137.441640
std 0.523731 0.639160 0.799033 0.952619 1.091478
min 20.126615 47.813274 77.357915 104.033857 131.978443
25% 24.498501 52.547855 80.509926 108.606293 136.877050
50% 24.835766 52.918841 80.950773 109.197236 137.498470
75% 25.137887 53.244013 81.376380 109.723791 138.101133
max 26.161997 54.372957 83.266046 111.709888 140.419400
nproc 88
100 200 300 400 500
count 1000.000000 1000.000000 1000.000000 1000.000000 1000.000000
mean 30.196867 64.467080 98.710365 133.024282 167.330900
std 0.749476 0.691460 0.863908 1.033780 1.240237
min 16.647491 60.034797 94.053510 128.281171 161.778166
25% 29.896764 64.121607 98.290368 132.484092 166.711172
50% 30.271808 64.514222 98.742714 133.089852 167.429483
75% 30.627200 64.903154 99.262584 133.706735 168.086624
max 31.806051 66.343856 101.077264 136.143873 170.449596
nproc 96
100 200 300 400 500
count 1000.000000 1000.000000 1000.000000 1000.000000 1000.000000
mean 36.304100 77.194851 117.958001 158.820159 199.868940
std 0.712442 0.718565 1.009163 1.220813 1.462219
min 31.128111 73.850226 112.075970 152.910227 192.977453
25% 35.928427 76.811233 117.466922 158.151278 199.058411
50% 36.378220 77.209148 117.998878 158.879704 199.861157
75% 36.761744 77.636286 118.615380 159.583272 200.701769
max 38.069263 79.445286 120.878239 162.826438 206.826424
nproc 104
100 200 300 400 500
count 1000.000000 1000.000000 1000.000000 1000.000000 1000.000000
mean 42.731401 90.887253 138.815476 186.824953 235.055458
std 1.045572 0.742232 0.999065 1.298818 1.554890
min 23.734733 87.384048 133.462821 180.971966 227.475939
25% 42.353032 90.441055 138.213962 186.109237 234.169575
50% 42.861112 90.900274 138.836083 186.835884 235.084204
75% 43.236527 91.382487 139.460129 187.694247 236.011148
max 44.600281 93.394394 141.959512 190.171221 239.491909
nproc 112
100 200 300 400
count 460.000000 460.000000 460.000000 460.000000
mean 49.782729 105.468739 161.416099 217.385757
std 0.904312 1.011980 1.222772 1.475225
min 45.334285 100.711113 156.087707 210.639527
25% 49.394518 104.971028 160.743875 216.590612
50% 49.906665 105.604756 161.528712 217.437408
75% 50.363428 106.088852 162.187166 218.286111
max 51.800116 108.372299 164.614385 221.788613
And now the same tests for tip+percpu_rwsem:
nproc 8
100 200 300 400 500
count 1000.000000 1000.000000 1000.000000 1000.000000 1000.000000
mean 0.285784 0.639623 0.935062 1.165287 1.457565
std 0.040458 0.089317 0.112704 0.094596 0.110337
min 0.118961 0.253775 0.351943 0.869095 1.026194
25% 0.263250 0.600806 0.858630 1.100281 1.376566
50% 0.287019 0.649395 0.930437 1.167166 1.461235
75% 0.312601 0.692013 1.013786 1.228887 1.533511
max 0.407264 0.860837 1.298671 1.460842 1.927867
nproc 16
100 200 300 400 500
count 1000.000000 1000.000000 1000.000000 1000.000000 1000.000000
mean 2.338683 5.219408 8.117279 11.050641 14.035433
std 0.146102 0.270400 0.392875 0.510692 0.576044
min 1.836110 4.179970 6.491748 8.998336 11.442838
25% 2.239374 5.042915 7.860587 10.728740 13.667630
50% 2.335801 5.217732 8.125243 11.052183 14.010561
75% 2.443152 5.404223 8.396037 11.404375 14.417740
max 2.798029 5.927344 9.172875 12.203548 15.444552
nproc 24
100 200 300 400 500
count 1000.000000 1000.000000 1000.000000 1000.000000 1000.000000
mean 6.399927 13.673487 20.729554 27.316864 34.125202
std 0.558388 1.157996 1.647191 2.066864 2.487975
min 4.961608 10.767524 17.145018 22.441426 28.566438
25% 5.987118 12.849801 19.555979 25.943463 32.399122
50% 6.388215 13.583983 20.533054 27.122120 33.959403
75% 6.915310 14.786835 22.252796 29.187176 36.308254
max 7.405319 15.823960 23.858206 31.754922 38.997955
nproc 32
100 200 300 400 500
count 1000.000000 1000.000000 1000.000000 1000.000000 1000.000000
mean 11.973832 24.885823 36.705614 48.036525 57.418669
std 1.270516 2.604583 3.963139 5.283237 6.441122
min 9.395066 19.958662 27.768684 38.247046 46.265231
25% 10.955417 22.708953 33.510437 43.613011 51.901209
50% 11.801515 24.556642 35.805816 47.315635 55.933447
75% 13.294692 27.520679 40.689642 53.139912 63.860584
max 14.217272 29.968337 44.409489 58.246754 71.045867
nproc 40
100 200 300 400 500
count 1000.000000 1000.000000 1000.000000 1000.000000 1000.000000
mean 19.307414 39.204462 55.768040 70.808627 83.830246
std 2.189803 3.982241 5.467692 6.737372 8.124025
min 14.450258 30.606836 44.342114 55.520218 64.704178
25% 17.418113 35.968251 51.341042 65.352697 77.744806
50% 19.067713 39.023460 55.548934 70.282785 83.374667
75% 21.479466 42.666118 60.379906 76.604241 91.158904
max 23.687483 47.019928 67.143361 85.084045 100.957011
nproc 48
100 200 300 400 500
count 1000.000000 1000.000000 1000.000000 1000.000000 1000.000000
mean 28.386773 55.462523 77.886706 92.579064 104.319703
std 3.231688 6.142373 8.633285 10.950222 12.510504
min 21.703659 42.486864 56.904221 66.605689 76.529646
25% 25.635256 50.575642 71.306694 82.931995 94.222776
50% 28.136694 55.235674 77.298409 91.993559 104.909015
75% 31.484979 60.645302 85.693462 102.195018 114.141212
max 35.713537 68.342796 96.065304 115.926497 130.916876
nproc 56
100 200 300 400 500
count 1000.000000 1000.000000 1000.000000 1000.000000 1000.000000
mean 39.037206 74.470404 97.900979 111.320283 135.943281
std 4.594741 8.940246 11.715321 13.823450 16.032080
min 29.532559 55.193557 65.590273 79.580482 98.565733
25% 35.212004 66.990273 88.066459 100.643871 122.864654
50% 38.796902 73.928176 96.771490 110.669216 136.199617
75% 43.154846 82.041731 108.937264 120.727216 147.769269
max 49.215714 92.181542 125.188702 141.113117 170.961264
nproc 64
100 200 300 400 500
count 1000.000000 1000.000000 1000.000000 1000.000000 1000.000000
mean 51.099012 93.028015 114.649700 145.944300 178.043572
std 6.310777 12.719401 14.675830 18.019135 21.084448
min 36.770938 54.620852 80.837116 98.765936 126.207980
25% 45.955694 84.078285 103.452854 132.127548 160.746493
50% 50.275929 93.031565 114.333533 144.951788 177.105994
75% 56.955477 104.656181 128.418118 163.865640 197.275452
max 63.369715 120.360706 146.542148 182.482159 218.814651
nproc 72
100 200 300 400 500
count 506.000000 506.000000 506.000000 506.000000 506.000000
mean 64.905270 108.760098 138.811285 179.277895 222.584001
std 8.784532 16.293281 18.160401 21.203767 25.904456
min 43.035451 64.762288 96.401934 127.995159 162.341026
25% 58.658290 98.438247 126.035692 162.944645 202.228444
50% 64.756854 109.608197 139.190635 181.413255 223.359111
75% 72.488483 123.608470 152.745541 195.549278 245.454358
max 83.424516 139.214509 172.538610 218.677815 270.799895
nproc 80
100 200 300 400 500
count 61.000000 61.000000 61.000000 61.000000 61.000000
mean 76.727789 124.438489 174.095378 225.855798 272.416390
std 9.757928 18.034325 20.216132 24.868596 29.384832
min 55.988043 83.842137 130.842940 173.596051 208.508169
25% 69.218268 116.679810 162.149179 207.015727 252.194955
50% 75.392969 125.378519 173.117425 225.071270 276.188038
75% 83.748328 136.689138 192.392097 245.019530 296.407232
max 97.004966 165.172805 206.391629 266.751069 318.089290
nproc 88
100
count 157.000000
mean 90.337638
std 15.239911
min 53.393662
25% 79.648088
50% 91.075065
75% 103.530939
max 120.680507
And an attempt at visualization:
http://monom.org/posix01/sweep-4.1.0-02756-ge3d06bd.png
http://monom.org/posix01/sweep-4.1.0-02769-g6ce2591.png
Let me know if these numbers help or not. I start to get better in
running those tests tough they take quite some time to finish. So if
they are useless I sleep well without doing this :)
cheers,
daniel
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