791051.fig.004a
(a)
791051.fig.004b
(b)
Figure 4: Streaming/pipelining in workflow systems: (a) no pipelining, where A starts computation only when all its input items are available, and so does B which processes the output items of A. (b) Pipelining, where A starts computation when any data item is available, and so does B. Note that in this mode A and B run concurrently on different data items.