Efficiency issue: next mvs runs slowly on 0616 dataset

[Yzhbuaa]

Hello, thank you for the great job. It appears that the 'Cycle' step runs really slow (it takes about 30 mins), and the log stucked after this step.

[Open3D DEBUG] Memory Usage: 3877.875 MB Cycle[0] Depth[0/9]: Updated constraints / Got system / Solved in: 0.000 / 0.000 / 0.000 (3881.965 MB) Nodes: 8 CG: 9.4684e-01 -> 9.4684e-01 -> 5.9029e-04 (6.2e-04) [32764] Cycle[0] Depth[1/9]: Updated constraints / Got system / Solved in: 0.156 / 0.000 / 0.000 (3881.965 MB) Nodes: 27 GS: 1.9062e+00 -> 1.9062e+00 -> 2.1500e-04 (1.1e-04) [8] Cycle[0] Depth[2/9]: Updated constraints / Got system / Solved in: 0.277 / 1.387 / 0.597 (3881.965 MB) Nodes: 125 GS: 1.7119e+00 -> 1.7119e+00 -> 2.0942e-03 (1.2e-03) [8] Cycle[0] Depth[3/9]: Updated constraints / Got system / Solved in: 0.275 / 1.989 / 1.011 (3882.020 MB) Nodes: 729 GS: 1.4747e+00 -> 1.4747e+00 -> 2.1253e-02 (1.4e-02) [8] Cycle[0] Depth[4/9]: Updated constraints / Got system / Solved in: 0.303 / 4.176 / 2.211 (3882.211 MB) Nodes: 4913 GS: 1.6054e+00 -> 1.6054e+00 -> 9.9846e-03 (6.2e-03) [8] Cycle[0] Depth[5/9]: Updated constraints / Got system / Solved in: 0.208 / 8.332 / 135.090 (3882.234 MB) Nodes: 35937 GS: 1.6391e+00 -> 1.6391e+00 -> 1.9308e-02 (1.2e-02) [8] Cycle[0] Depth[6/9]: Updated constraints / Got system / Solved in: 0.217 / 9.175 / 133.373 (3885.305 MB) Nodes: 72148 GS: 1.4771e+00 -> 1.4771e+00 -> 1.1873e-02 (8.0e-03) [8] Cycle[0] Depth[7/9]: Updated constraints / Got system / Solved in: 0.360 / 15.633 / 228.090 (3903.855 MB) Nodes: 249640 GS: 1.2345e+00 -> 1.2345e+00 -> 1.2027e-02 (9.7e-03) [8] Cycle[0] Depth[8/9]: Updated constraints / Got system / Solved in: 0.371 / 27.746 / 406.301 (3926.004 MB) Nodes: 679384 GS: 9.3066e-01 -> 9.3066e-01 -> 6.0916e-03 (6.5e-03) [8] Cycle[0] Depth[9/9]: Updated constraints / Got system / Solved in: 0.269 / 51.742 / 700.999 (3962.273 MB) Nodes: 1187480 GS: 5.1887e-01 -> 5.1887e-01 -> 1.6380e-03 (3.2e-03) [8] [Open3D DEBUG] # Linear system solved: 1850.25 (s), 3962.27 (MB) / 3962.27 (MB) / 6399 (MB) [Open3D DEBUG] Got average: 1.36893 (s), 3893.67 (MB) / 3962.27 (MB) / 6399 (MB) [Open3D DEBUG] Iso-Value: 5.007892e-01 = 5.422877e+05 / 1.082866e+06