DA-05: Steer a large computation while it runs

Executive Summary: 
A researcher needs to “steer” a large computation while it is running to focus on important or interesting parameters. The researcher inspects or visualizes the output of the computation while it is running and adjusts the parameters used for the remainder of the computation.
User Importance Summary: 
Simulations that run on large-scale computing systems consume vast amounts of computing power. In some cases, the researcher does not know in advance which parts of the simulation will be valuable and which will not be valuable. The ability to monitor a simulation in progress and change its configuration while running can reduce the overall cost of generating scientifically useful results.
Target Communities and Sizes: 
Researchers - 10,000 < N < 100,000