1. A method, comprising: determining a number of a plurality of threads in a parallel processing architecture that have completed processing a corresponding ray tracing entity; and conditionally selecting an additional ray tracing entity from a group of ray tracing entities for processing by the parallel processing architecture, based on the determined number; wherein a first number of the threads execute node traversal and a second number of the threads execute primitive intersection; wherein the first number of threads executing the node traversal and the second number of threads executing the primitive intersection are compared, and only the node traversal is executed utilizing each of the threads if the first number is greater than the second number.