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Subjectpage fault scalability patch V12: rss tasklist vs sloppy rss
On Thu, 9 Dec 2004, Hugh Dickins wrote:

> How do the scalability figures compare if you omit patch 7/7 i.e. revert
> the per-task rss complications you added in for Linus? I remain a fan
> of sloppy rss, which you earlier showed to be accurate enough (I'd say),
> though I guess should be checked on other architectures than your ia64.
> I can't see the point of all that added ugliness for numbers which don't
> need to be precise - but perhaps there's no way of rearranging fields,
> and the point at which mm->(anon_)rss is updated (near up of mmap_sem?),
> to avoid destructive cacheline bounce. What I'm asking is, do you have
> numbers to support 7/7? Perhaps it's the fact you showed up to 512 cpus
> this time, but only up to 32 with sloppy rss? The ratios do look better
> with the latest, but the numbers are altogether lower so we don't know.

Here is a full set of numbers for sloppy and tasklist. The sloppy version
is 2.6.9-rc2-bk14 with the prefault patch also applied and the tasklist
version is 2.6.9-rc2-bk12 w/o prefault (you can get the numbers of
2.6.9-rc2-bk12 w prefault in the post titled "anticipatory prefaulting
in the page fault handler")). Even with this handicap
tasklist is still slightly better! I would expect tasklist to increase in
importance for combination patches which increase the fault rate even
more. The tasklist is likely to be unavoidable once I get the prezeroing
patch debugged and integrated which should at least give us a peak pulse
performance for page faults > 5 mio faults /sec.

I was not also able to get the high numbers of > 3 mio faults with atomic
rss + prefaulting but was able to get that with tasklist + prefault. The
atomic version shares the locality problems with the sloppy approach.

sloppy (2.6.10-bk14-rss-sloppy-prefault):
Gb Rep Threads User System Wall flt/cpu/s fault/wsec
1 10 1 0.040s 6.505s 6.054s100117.616 100072.760
1 10 2 0.041s 7.394s 4.005s 88138.739 161535.358
1 10 4 0.049s 7.863s 2.049s 82819.743 262839.190
1 10 8 0.093s 8.657s 1.077s 74889.898 369606.184
1 10 16 0.621s 13.278s 1.076s 47150.165 371506.561
1 10 32 3.154s 35.337s 2.029s 17025.784 285469.956
1 10 64 11.602s 77.548s 2.086s 7351.089 228908.831
1 10 128 41.999s 217.106s 4.030s 2529.316 152087.458
1 10 256 40.482s 106.627s 3.022s 4454.885 203363.548
1 10 512 63.673s 61.361s 3.040s 5241.403 192528.941
Gb Rep Threads User System Wall flt/cpu/s fault/wsec
4 10 1 0.176s 41.276s 41.045s 63238.628 63237.008
4 10 2 0.154s 31.074s 16.095s 83943.753 154606.489
4 10 4 0.193s 31.886s 9.096s 81715.471 263190.941
4 10 8 0.210s 33.577s 6.061s 77584.707 396402.083
4 10 16 0.473s 52.997s 6.036s 49025.701 411640.587
4 10 32 3.331s 142.296s 7.093s 18000.934 330197.326
4 10 64 10.820s 318.485s 8.088s 7960.503 295042.520
4 10 128 56.012s 928.004s 12.037s 2664.019 211812.600
4 10 256 46.197s 464.579s 7.026s 5132.263 360940.189
4 10 512 57.396s 225.876s 4.081s 9254.125 544185.485
Gb Rep Threads User System Wall flt/cpu/s fault/wsec
16 10 1 0.948s 221.167s 222.009s 47208.624 47212.786
16 10 2 0.824s 205.021s 110.022s 50939.876 95134.456
16 10 4 0.689s 168.670s 53.055s 61914.226 195802.740
16 10 8 0.683s 137.278s 27.034s 76004.706 383471.968
16 10 16 0.969s 216.288s 24.031s 48264.109 431329.422
16 10 32 3.932s 587.987s 30.002s 17714.820 349219.905
16 10 64 13.542s 1253.834s 32.051s 8273.588 322528.516
16 10 128 54.197s 3161.896s 38.064s 3260.403 271357.849
16 10 256 57.610s 1668.913s 21.038s 6073.335 490410.386
16 10 512 36.721s 833.691s 11.069s 12046.872 896970.623
Gb Rep Threads User System Wall flt/cpu/s fault/wsec
32 10 1 2.080s 470.722s 472.075s 44355.728 44360.409
32 10 2 1.836s 456.343s 242.088s 45771.267 86344.100
32 10 4 1.671s 432.569s 131.065s 48294.609 159291.360
32 10 8 1.457s 354.825s 71.027s 58862.070 294242.410
32 10 16 1.660s 431.057s 48.038s 48464.636 433466.055
32 10 32 3.639s 1190.388s 59.040s 17563.676 353012.708
32 10 64 14.623s 2490.393s 63.040s 8371.808 330750.309
32 10 128 68.481s 6415.265s 76.053s 3234.476 274023.655
32 10 256 63.428s 3216.337s 39.044s 6394.212 531665.931
32 10 512 50.693s 1644.307s 21.035s 12372.572 982183.559
Gb Rep Threads User System Wall flt/cpu/s fault/wsec
64 10 1 4.457s 1021.948s1026.030s 40863.994 40868.119
64 10 2 3.929s 994.825s 525.030s 41995.308 79844.658
64 10 4 3.661s 931.523s 269.014s 44849.990 155838.443
64 10 8 3.355s 858.565s 153.098s 48662.260 272381.402
64 10 16 3.130s 904.485s 101.090s 46212.285 411581.778
64 10 32 5.007s 2366.494s 116.079s 17686.275 359107.203
64 10 64 17.472s 5195.222s 126.012s 8046.325 332545.646
64 10 128 65.249s 12515.845s 147.053s 3333.815 284290.928
64 10 256 61.328s 6706.566s 78.061s 6197.354 533523.711
64 10 512 60.656s 3201.068s 39.095s 12859.162 1049637.054
Gb Rep Threads User System Wall flt/cpu/s fault/wsec
128 10 8 7.481s 1875.297s 318.049s 44554.389 263386.340
128 10 16 7.128s 2048.919s 230.060s 40799.672 363757.736
128 10 32 9.584s 4758.868s 241.094s 17591.883 346711.571
128 10 64 17.955s 10135.674s 249.025s 8261.684 336547.279
128 10 128 66.939s 25006.914s 287.019s 3345.560 292086.404
128 10 256 62.454s 12892.242s 149.035s 6475.341 561653.696
128 10 512 59.082s 6456.965s 77.002s 12873.768 1089026.647
Gb Rep Threads User System Wall flt/cpu/s fault/wsec
256 10 8 17.201s 4672.781s 860.094s 35772.446 194870.225
256 10 16 16.641s 5071.433s 588.076s 32973.603 284954.772
256 10 32 17.745s 9193.335s 478.005s 18214.166 350950.045
256 10 64 25.474s 20440.137s 510.037s 8197.759 328725.189
256 10 128 65.451s 50015.195s 572.044s 3350.040 293079.914
256 10 256 61.296s 25191.675s 290.084s 6643.660 576852.282
256 10 512 58.911s 12589.530s 149.012s 13264.255 1125015.367

tasklist (2.6.10-rc2-bk12-rss-tasklist):

Gb Rep Threads User System Wall flt/cpu/s fault/wsec
1 3 1 0.045s 2.042s 2.009s 94121.837 94039.902
1 3 2 0.053s 2.217s 1.022s 86554.869 160093.661
1 3 4 0.036s 2.325s 0.074s 83261.622 265213.249
1 3 8 0.065s 2.507s 0.053s 76404.784 370587.422
1 3 16 0.168s 4.727s 0.057s 40152.877 341385.368
1 3 32 0.829s 11.408s 0.070s 16066.277 280690.973
1 3 64 4.324s 25.591s 0.093s 6571.995 209956.473
1 3 128 19.370s 81.568s 1.055s 1947.799 126774.712
1 3 256 13.042s 46.608s 1.009s 3295.950 179708.774
1 3 512 19.410s 28.085s 0.092s 4139.454 211823.959
Gb Rep Threads User System Wall flt/cpu/s fault/wsec
4 3 1 0.161s 12.698s 12.086s 61156.292 61149.853
4 3 2 0.152s 10.469s 5.073s 74037.518 137039.041
4 3 4 0.179s 9.401s 2.098s 82081.949 263750.289
4 3 8 0.156s 10.194s 1.098s 75979.430 395361.526
4 3 16 0.407s 18.084s 2.010s 42527.778 373673.111
4 3 32 0.824s 44.316s 2.031s 17421.815 339975.566
4 3 64 4.706s 96.587s 2.066s 7763.856 295588.217
4 3 128 17.453s 259.672s 3.053s 2837.813 222395.530
4 3 256 17.090s 136.816s 2.017s 5109.777 361440.098
4 3 512 13.466s 78.242s 1.043s 8575.295 548859.306
Gb Rep Threads User System Wall flt/cpu/s fault/wsec
16 3 1 0.678s 61.548s 62.023s 50551.998 50544.748
16 3 2 0.691s 63.381s 34.027s 49095.790 91791.474
16 3 4 0.663s 52.083s 16.086s 59639.041 186542.124
16 3 8 0.585s 43.339s 9.031s 71614.583 337721.897
16 3 16 0.744s 75.174s 8.003s 41435.328 391278.035
16 3 32 1.713s 171.942s 8.086s 18114.674 354760.887
16 3 64 4.720s 366.803s 9.055s 8467.079 329273.168
16 3 128 22.637s 849.059s 10.093s 3608.741 287572.764
16 3 256 15.849s 472.565s 6.009s 6440.683 515916.601
16 3 512 15.479s 245.305s 3.046s 12062.521 909147.611
Gb Rep Threads User System Wall flt/cpu/s fault/wsec
32 3 1 1.451s 140.151s 141.060s 44430.367 44428.115
32 3 2 1.399s 136.349s 73.041s 45673.303 85699.793
32 3 4 1.321s 129.760s 39.027s 47996.303 160197.217
32 3 8 1.279s 100.648s 20.039s 61724.641 308454.557
32 3 16 1.414s 153.975s 15.090s 40488.236 395681.716
32 3 32 2.534s 337.021s 17.016s 18528.487 366445.400
32 3 64 4.271s 709.872s 18.057s 8809.787 338656.440
32 3 128 18.734s 1805.094s 21.084s 3449.586 288005.644
32 3 256 14.698s 963.787s 11.078s 6429.787 534077.540
32 3 512 15.299s 453.990s 5.098s 13406.321 1050416.414
Gb Rep Threads User System Wall flt/cpu/s fault/wsec
64 3 1 3.018s 301.014s 304.004s 41386.617 41384.901
64 3 2 2.941s 296.780s 157.005s 41981.967 80116.179
64 3 4 2.810s 280.803s 82.047s 44366.266 152575.551
64 3 8 2.763s 268.745s 48.099s 46344.377 256813.576
64 3 16 2.764s 332.029s 34.030s 37584.030 366744.317
64 3 32 3.337s 704.321s 34.074s 17781.025 362195.710
64 3 64 7.395s 1475.497s 36.078s 8485.379 342026.888
64 3 128 22.227s 3188.934s 40.044s 3918.492 311115.971
64 3 256 18.004s 1834.246s 21.093s 6793.308 573753.797
64 3 512 19.367s 861.324s 10.099s 14287.531 1144168.224

Gb Rep Threads User System Wall flt/cpu/s fault/wsec
128 3 4 5.857s 626.055s 189.010s 39824.798 133076.331
128 3 8 5.837s 592.587s 107.080s 42053.423 233443.791
128 3 16 5.852s 666.252s 71.008s 37443.301 354011.649
128 3 32 6.305s 1365.184s 69.075s 18349.259 360755.364
128 3 64 8.450s 2914.730s 72.046s 8609.057 347288.474
128 3 128 21.188s 6719.590s 79.078s 3733.370 315402.750
128 3 256 18.263s 3672.379s 43.049s 6818.817 578587.427
128 3 512 17.625s 1901.969s 22.082s 13109.967 1102629.479

128 3 256 24.035s 3392.117s 40.074s 7366.714 617628.607
128 3 512 17.000s 1820.242s 21.072s 13697.601 1158632.106

Gb Rep Threads User System Wall flt/cpu/s fault/wsec
256 3 4 11.976s 1660.924s 514.023s 30086.443 97877.018
256 3 8 11.618s 1301.448s 223.063s 38331.361 225057.902
256 3 16 11.696s 1409.158s 148.074s 35423.488 338379.838
256 3 32 12.678s 2668.417s 140.042s 18772.788 358421.926
256 3 64 15.933s 5833.804s 145.068s 8604.085 345487.685
256 3 128 32.640s 13437.080s 159.079s 3736.651 314981.569
256 3 256 23.875s 6835.241s 81.007s 7337.919 620777.397
256 3 512 17.566s 3392.148s 41.003s 14761.249 1226507.319

256 3 256 21.314s 6648.629s 79.085s 7546.038 630270.726
256 3 512 15.994s 3400.378s 40.087s 14732.481 1231399.906
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