For utilizing long fat networks effectively, parallel TCP was proposed, and has been employed. However, as high-speed transport-layer protocols appear, it is necessary to reinvestigate the performance of parallel TCP. This paper uses mathematical analysis to explore its performance. Analysis results show that the open issue of choosing the number of TCP connections is difficult to be solved in practice. Despite the mechanism that adjusts the number of TCP connections during data transfer is proposed, some potential problems still remain. In contrast, it is a better choice to use high-speed TCP in your future applications.
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