Hi, I tried to figure out the effect of parallelism when transferring one file in the WAN. I transferred 100M and 1G file respectively with parallelism ranging from 1 to 8. However, I observed weird trend in that the bandwidth jumped up and down with increasing parallelism. I tried tcpdump to see whether all parallel connections are used. The tcpdump output shows that packets are not divided equally among multiple connections, instead, a portion of connections do most of the transfer. How is parallelism implemented in GridFTP? It seems the file is not divided equally among multiple connections. When is parallelism beneficial?
Thanks, Ruiqi
