Engineering a Multi-core Radix Sort
- Cite this paper as:
- Wassenberg J., Sanders P. (2011) Engineering a Multi-core Radix Sort. In: Jeannot E., Namyst R., Roman J. (eds) Euro-Par 2011 Parallel Processing. Euro-Par 2011. Lecture Notes in Computer Science, vol 6853. Springer, Berlin, Heidelberg
We present a fast radix sorting algorithm that builds upon a microarchitecture-aware variant of counting sort. Taking advantage of virtual memory and making use of write-combining yields a per-pass throughput corresponding to at least 89% of the system’s peak memory bandwidth. Our implementation outperforms Intel’s recently published radix sort by a factor of 1.64. It also compares favorably to the reported performance of an algorithm for Fermi GPUs when data-transfer overhead is included. These results indicate that scalar, bandwidth-sensitive sorting algorithms remain competitive on current architectures. Various other memory-intensive applications can benefit from the techniques described herein.
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