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Brief Announcement: Scalable Distributed String Sorting

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String sorting is an important part of tasks such as building index data structures. Unfortunately, current string sorting algorithms do not scale to massively parallel distributed-memory machines since they either have latency (at least) proportional to the number of processors p or communicate the data a large number of times (at least logarithmic). We present practical and efficient algorithms for distributed-memory string sorting that scale to large p. Similar to state-of-the-art sorters for atomic objects, the algorithms have latency of about p^{1/k} when allowing the data to be communicated k times. Experiments show good scaling behavior on a wide range of inputs on up to 49,152 cores. We achieve speedups of up to 5 over the current state-of-the-art distributed string sorting algorithms.


  author    = {Florian Kurpicz and Pascal Mehnert and Peter Sanders and Matthias Schimek},
  title     = {Brief Announcement: Scalable Distributed String Sorting},
  booktitle = {SPAA},
  pages     = {375--377},
  publisher = {ACM},
  doi       = {10.1145/3626183.3660256},
  year      = {2024}