File Download Delay Reduction through Parallelization

The file download process over Internet is usually slow. This paper presents design and simulation of a distributed and co-ordinated file transfer protocol for the Internet applications. Presented approach, known as hybrid parallelized file transport protocol (HPFTP), consist of a centralized server that distributes the download process across multiple file servers based on QoS parameters as available bandwidth. H-PFTP client monitor the FTP flows to detect slow servers and adjust the file distributions accordingly. The Hybrid parallelized FTP (H-PFTP) approach, attempts to solve the problem of slow downloads of large multimedia files while optimizing the utilization of mirror servers. HPFTP proposes simultaneous downloads of file from multiple file servers. H-PFTP is combination of DAP and P-FTP. Slow server detection algorithm and link failure algorithm is used to increase performance of H-PFTP. In this paper, simulation of hybrid parallelized file transfer protocol (H-PFTP) is presented. The simulation is carried out by using widely used network simulator, Network Simulator 2 (NS2). The results show at least 50% reduction in download time, when compared to the traditional file-transfer approach.