Multicomputer Technology Initiative |
The Upshot output takes the form of a timeline, with bars representing each process running on the cluster. The left margin of the bar chart has numbers that represent the task IDs for the process, with '0' indicating the 'master' process. The bars are coloured according to the MPI functions that are being executed at any point in time. The key above the graph indicates the functions that are represented by different colours. The units on the x-axis are seconds. In contrast with the XPVM output (see PVM results), Upshot gives detail about the MPI functions that are executing, rather than the overall program state. There is thus no direct indication of when processing is being performed. It should also be noted that, although there are arrows representing message-passing via MPI_Send, the messages corresponding to an MPI_Bcast are not shown explicitly.
All results have been obtained using MPICH version 1.1.2. The hardware
used is described here.
The algorithm has been run using different numbers of processors in order to indicate the advantage of implementing a parallel solution. Each run was performed for 3 generations and a population vector size of 100. Upshot has been used to visualise program/process status during a sample run. The adjacent graph shows plots for different numbers of processors, with MPICH running with the logging library linked in. Interesting features of the data include: