0 init
1 init
2 init

0 Irecv 1 0 2000
1 Isend 0 0 2000
2 Irecv 1 1 3000

0 Irecv 2 2 3000
1 Isend 2 1 3000
2 Isend 0 2 3000

0 waitall
1 waitall
2 waitall

0 finalize
1 finalize
2 finalize