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GtkSort is an easy to use external disk sorter for binary or text files. The application sorts fixed or variable length record files with multiple ascending or descending keys.

GtkSort processes files using multi threading in order to implement parallel algorithms. It overlaps disk I/O with sorting and reduces I/O waits. By using only sequential files it utilizes the most of the disk's I/O bandwidth.

By giving exclusive read or write permissions for each processed file to only one thread, it minimizes the conflicting I/O requests that reduce the hard disk's efficiency. In order to sort records, and depending on the data type of the sort keys, GtkSort uses the standard library quick sort or its own implementation of Most Significant Digit (MSD) radix sort. GtkSort uses cache efficient algorithms keeping the cache misses at a very low rate.