On Fri, 08 Feb 2019, Waiman Long wrote:
I am planning to run more performance test and post the data sometimes next week. Davidlohr is also going to run some of his rwsem performance test on this patchset.
So I ran this series on a 40-core IB 2 socket with various worklods in mmtests. Below are some of the interesting ones; full numbers and curves at https://linux-scalability.org/rwsem-reader-spinner/ All workloads are with increasing number of threads. -- pagefault timings: pft is an artificial pf benchmark (thus reader stress). metric is faults/cpu and faults/sec v5.0-rc6 v5.0-rc6 dirty Hmean faults/cpu-1 624224.9815 ( 0.00%) 618847.5201 * -0.86%* Hmean faults/cpu-4 539550.3509 ( 0.00%) 547407.5738 * 1.46%* Hmean faults/cpu-7 401470.3461 ( 0.00%) 381157.9830 * -5.06%* Hmean faults/cpu-12 267617.0353 ( 0.00%) 271098.5441 * 1.30%* Hmean faults/cpu-21 176194.4641 ( 0.00%) 175151.3256 * -0.59%* Hmean faults/cpu-30 119927.3862 ( 0.00%) 120610.1348 * 0.57%* Hmean faults/cpu-40 91203.6820 ( 0.00%) 91832.7489 * 0.69%* Hmean faults/sec-1 623292.3467 ( 0.00%) 617992.0795 * -0.85%* Hmean faults/sec-4 2113364.6898 ( 0.00%) 2140254.8238 * 1.27%* Hmean faults/sec-7 2557378.4385 ( 0.00%) 2450945.7060 * -4.16%* Hmean faults/sec-12 2696509.8975 ( 0.00%) 2747968.9819 * 1.91%* Hmean faults/sec-21 2902892.5639 ( 0.00%) 2905923.3881 * 0.10%* Hmean faults/sec-30 2956696.5793 ( 0.00%) 2990583.5147 * 1.15%* Hmean faults/sec-40 3422806.4806 ( 0.00%) 3352970.3082 * -2.04%* Stddev faults/cpu-1 2949.5159 ( 0.00%) 2802.2712 ( 4.99%) Stddev faults/cpu-4 24165.9454 ( 0.00%) 15841.1232 ( 34.45%) Stddev faults/cpu-7 20914.8351 ( 0.00%) 22744.3294 ( -8.75%) Stddev faults/cpu-12 11274.3490 ( 0.00%) 14733.3152 ( -30.68%) Stddev faults/cpu-21 2500.1950 ( 0.00%) 2200.9518 ( 11.97%) Stddev faults/cpu-30 1599.5346 ( 0.00%) 1414.0339 ( 11.60%) Stddev faults/cpu-40 1473.0181 ( 0.00%) 3004.1209 (-103.94%) Stddev faults/sec-1 2655.2581 ( 0.00%) 2405.1625 ( 9.42%) Stddev faults/sec-4 84042.7234 ( 0.00%) 57996.7158 ( 30.99%) Stddev faults/sec-7 123656.7901 ( 0.00%) 135591.1087 ( -9.65%) Stddev faults/sec-12 97135.6091 ( 0.00%) 127054.4926 ( -30.80%) Stddev faults/sec-21 69564.6264 ( 0.00%) 65922.6381 ( 5.24%) Stddev faults/sec-30 51524.4027 ( 0.00%) 56109.4159 ( -8.90%) Stddev faults/sec-40 101927.5280 ( 0.00%) 160117.0093 ( -57.09%) With the exception of the hicup at 7 threads, things are pretty much in the noise region for both metrics. -- git checkout First metric is total runtime for runs with incremental threads. v5.0-rc6 v5.0-rc6 dirty User 218.95 219.07 System 149.29 146.82 Elapsed 1574.10 1427.08 In this case there's a non trivial improvement (11%) in overall elapsed time. -- reaim (which is always succeptible to rwsem changes for both mmap_sem and i_mmap) v5.0-rc6 v5.0-rc6 dirty Hmean compute-1 6674.01 ( 0.00%) 6544.28 * -1.94%* Hmean compute-21 85294.91 ( 0.00%) 85524.20 * 0.27%* Hmean compute-41 149674.70 ( 0.00%) 149494.58 * -0.12%* Hmean compute-61 177721.15 ( 0.00%) 170507.38 * -4.06%* Hmean compute-81 181531.07 ( 0.00%) 180463.24 * -0.59%* Hmean compute-101 189024.09 ( 0.00%) 187288.86 * -0.92%* Hmean compute-121 200673.24 ( 0.00%) 195327.65 * -2.66%* Hmean compute-141 213082.29 ( 0.00%) 211290.80 * -0.84%* Hmean compute-161 207764.06 ( 0.00%) 204626.68 * -1.51%* The 'compute' workload overall takes a small hit. Hmean new_dbase-1 60.48 ( 0.00%) 60.63 * 0.25%* Hmean new_dbase-21 6590.49 ( 0.00%) 6671.81 * 1.23%* Hmean new_dbase-41 14202.91 ( 0.00%) 14470.59 * 1.88%* Hmean new_dbase-61 21207.24 ( 0.00%) 21067.40 * -0.66%* Hmean new_dbase-81 25542.40 ( 0.00%) 25542.40 * 0.00%* Hmean new_dbase-101 30165.28 ( 0.00%) 30046.21 * -0.39%* Hmean new_dbase-121 33638.33 ( 0.00%) 33219.90 * -1.24%* Hmean new_dbase-141 36723.70 ( 0.00%) 37504.52 * 2.13%* Hmean new_dbase-161 42242.51 ( 0.00%) 42117.34 * -0.30%* Hmean shared-1 76.54 ( 0.00%) 76.09 * -0.59%* Hmean shared-21 7535.51 ( 0.00%) 5518.75 * -26.76%* Hmean shared-41 17207.81 ( 0.00%) 14651.94 * -14.85%* Hmean shared-61 20716.98 ( 0.00%) 18667.52 * -9.89%* Hmean shared-81 27603.83 ( 0.00%) 23466.45 * -14.99%* Hmean shared-101 26008.59 ( 0.00%) 29536.96 * 13.57%* Hmean shared-121 28354.76 ( 0.00%) 43139.39 * 52.14%* Hmean shared-141 38509.25 ( 0.00%) 41619.35 * 8.08%* Hmean shared-161 40496.07 ( 0.00%) 44303.46 * 9.40%* Overall there is a small hit (in the noise level but consistent throughout many workloads), except git-checkout which does quite well. Thanks, Davidlohr
