  In the coming era of exascale supercomputing, in-situ visualization will be a
crucial approach for reducing the output data size. A problem of in-situ
visualization is that it loses interactivity if a steering method is not
adopted. In this paper, we propose a new method for the interactive analysis of
in-situ visualization images produced by a batch simulation job. A key idea is
to apply numerous (thousands to millions) in-situ visualizations
simultaneously. The viewer then analyzes the image database interactively
during postprocessing. If each movie can be compressed to 100 MB, one million
movies will only require 100 TB, which is smaller than the size of the raw
numerical data in exascale supercomputing. We performed a feasibility study
using the proposed method. Multiple movie files were produced by a simulation
and they were analyzed using a specially designed movie player. The user could
change the viewing angle, the visualization method, and the parameters
interactively by retrieving an appropriate sequence of images from the movie
dataset.
