1Initial Vec A 2Vec Object: 1 MPI processes 3 type: seq 40. 51. 62. 73. 8 9Broadcast A->B over sfA 10Vec Object: 1 MPI processes 11 type: seq 123. 132. 141. 150. 16 17Broadcast B->BA over sfB 18Vec Object: 1 MPI processes 19 type: seq 203. 212. 221. 230. 24 25Broadcast A->BA over sfBA (sfB o sfA) 26Vec Object: 1 MPI processes 27 type: seq 283. 292. 301. 310. 32PetscSF Object: sfA 1 MPI processes 33 type: basic 34 sort=rank-order 35 [0] Number of roots=4, leaves=4, remote ranks=1 36 [0] 3 <- (0,0) 37 [0] 2 <- (0,1) 38 [0] 1 <- (0,2) 39 [0] 0 <- (0,3) 40PetscSF Object: sfB 1 MPI processes 41 type: basic 42 sort=rank-order 43 [0] Number of roots=4, leaves=4, remote ranks=1 44 [0] 0 <- (0,0) 45 [0] 1 <- (0,1) 46 [0] 2 <- (0,2) 47 [0] 3 <- (0,3) 48PetscSF Object: (sfB o sfA) 1 MPI processes 49 type: basic 50 sort=rank-order 51 [0] Number of roots=4, leaves=4, remote ranks=1 52 [0] 0 <- (0,3) 53 [0] 1 <- (0,2) 54 [0] 2 <- (0,1) 55 [0] 3 <- (0,0) 56