Using multiple predictors to improve the accuracy of file access predictions

Existing file access predictors keep track of previous file access patterns and rely on a single heuristic to pre-dict which of the previous successors to the file being currently accessed is the most likely to be accessed next. We present here a novel composite predictor that applies multiple heuristics to this selection problem. As a result, it can make use of specialized heuristics that can make very accurate predictions when access patterns are observed to meet their particular criteria. Simulation results involving a total of seven file access traces indi-cate that our predictor delivers more correct predictions and less inaccurate guesses than predictors relying on a single heuristic for selecting a successor. 1