0 init 1 1 init 1 2 init 1 0 bcast 5e4 1 0 1 bcast 5e4 1 0 2 bcast 5e4 1 0 0 compute 5e8 1 compute 2e8 2 compute 5e8 0 bcast 5e4 0 3 1 bcast 5e4 0 3 2 bcast 5e4 0 3 0 compute 5e8 1 compute 2e8 2 compute 5e8 0 reduce 5e4 5e8 0 4 1 reduce 5e4 5e8 0 4 2 reduce 5e4 5e8 0 4 0 finalize 1 finalize 2 finalize