Better placement of objects reachable from outside a generation managed by the train algorithm

Abstract

A garbage collector for more efficient placement of objects referenced from external references. The expected life times of these objects is measured by trial and error, by the class or type, by how often the object has been evacuated or the external reference processed, by the stability and longevity of the root source, or by the prolificness of the class or type of object. The measured value is held in the header of each object in an AGE field available for this purpose. These objects may be evacuated into existing trains or into new trains, or into a combination of existing and new trains. When new trains are created the trains are distributed among the existing trains according to a distribution contour that may be linear, normal, gamma or any other contour that might be found useful. Also, when new trains are created the youngest train must be a new train. When objects are evacuated into existing trains the objects are placed in trains according the survivability of the objects with the longer-lived objects placed proportionally in the younger trains. The objects are evacuated into the new trains from oldest to youngest Is trains according to the value in the AGE field. The higher the value the younger the train. A threshold on the AGE value may be established such that when the threshold is reached, the objects are evacuated into the youngest new train.

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