Expand description
§quickcdc
quickcdc is a fast content defined chunker.
- For some background information, see AE: An Asymmetric Extremum Content Defined Chunking Algorithm by Yucheng Zhang.
- Modification(s):
- User may provide salt, introducing entropy / cutpoint variation (i.e. files re-processed with different salt values will produce different cutpoints).
- Warp forward (reduced window size), skipping some unnecessary processing that happens before minimum chunk size is reached.
This should be faster than many CDC algorithms (anecdotal performance: 2GB/s on an amd1950x with an NVMe drive), but faster alternatives exist.
- For more information, see FastCDC
NOTE: This implementation performs much faster when built with --release.