CrocSort: Resource-Efficient, Skew-Resilient Parallel External Merge Sort
Summary: CrocSort byte-balances external merge sort and analytically tunes memory and per-phase parallelism, avoiding wasteful over-allocation. Reused run sparse indexes provide skew-resilient partitioning, while offset-value codes reduce comparisons and intermediate I/O. (summarized by gpt-5.6-luna on Aug 28 2026)
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Authors
- 1. Riki Otaki (University of Chicago)
- 2. Charles Benello (University of Chicago)
- 3. Fuheng Zhao (University of Utah)
- 4. Aaron J. Elmore (University of Chicago)
- 5. Goetz Graefe (Google)
BibTeX Citation
@article{otaki_vldb26,
title = {{CrocSort: Resource-Efficient, Skew-Resilient Parallel External Merge Sort}},
author = {Otaki, Riki and Benello, Charles and Zhao, Fuheng and Elmore, Aaron J. and Graefe, Goetz},
journal = {PVLDB},
series = {{VLDB} '26},
volume = {19},
number = {11},
pages = {2978--2991},
doi = {10.14778/3836663.3836667},
url = {https://doi.org/10.14778/3836663.3836667},
year = {2026}
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