Abstract: A computerized method, apparatus, and executable instructions on a machine readable medium for using multiple processors in parallel to create a pack vector from an array in memory. In some embodiments creating the pack vector includes reading portions of the array into a plurality of processors that each select a subset of elements from the their respective portions of the array based on a predetermined criteria. Some embodiments further include counting each of the selected subsets of elements and storing each count in a commonly accessible storage location, reading into the processors at least some of the count values once all of the processors have stored their count, and storing only the selected subsets of elements in the pack vector based at least in part on the count values.