Top - Publication list Data Figure 4 shows the transfer rate in MBytes per second obtained in nighttime runs, with no other processors in use. The machine was open to other users, possibly explaining some variations in performance. The best performance was just under 5 Mbytes per second, about half of the theoretical maximum for the hardware. Many cases transferred less than 2 Mbytes per second. The results show a definite peak in the transfer rate when 16 nodes are used.
Performance drops sharply for large numbers of nodes.
Performance on the loaded system. There was so much variation, even between identical runs, that the data have simply been presented in a scatter plot. No consistent dependence on grid size is seen. The peak in performance at 16 nodes seems to be visible, but the variations between runs are so large that it is hard to draw any additional conclusions. Effect of location of nodes within the machine.