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                           کامپیوتر و شبکه:: 
                            گراف مدور
                        
                        Based on the mechanism of communication pipeline, it can be applied to both acyclic and cyclic graphs.
However, for acyclic graphs, communication pipeline can be used as much as possible, while for cyclic graphs, the usage of communi- cation pipeline is limited by the number of delayed iterations in the task loop to avoid deadlock [6].
We aim to map a directed cyclic graph onto a 2-CPU platform as shown in Fig.  3  and  its  task  execution  time  and communication time before mapping  is  shown  beside  the node and the edge (italic) of the graph.
Therefore, while load balance and communication pipeline allocation can be obtained simultaneously for acyclic graphs, the two factors re- quire a tradeoff for cyclic  graphs.
For  cyclic  graphs, the
 
                        
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