Both of these steps are nearly linearly parallel until the amount of work per node is greatly reduced, at which time the efficiency levels off. It is always a concern to balance the CPU time and the efficiency of the run. Figure 3 shows the compromise between speedup and efficiency. The crossover point between these two curves gives a general guideline for the optimal number of nodes on which to run efficiently. The speed of the cyclophane calculations improved as more T3E processors are applied.
Speed is shown in red, efficiency in blue.
Larger test cases have been calculated to test the bounds of the parallel environments. 50 H 10 tested the limits of the parallel platforms. The T3D and Paragon platforms behave similarly. These calculations again show the significance of targeting the right size and number of nodes for a particular calculation. QMView runs on a variety of workstations.