Difference between revisions of "User:StefanoZacchiroli/Content deduplication"
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| Line 9: | Line 9: | ||
* original size (uncompressed): '''55.89 GB''' | * original size (uncompressed): '''55.89 GB''' | ||
| − | == Rabin | + | == Rabin fingerprint chunking == |
| − | * Approach: use [https://en.wikipedia.org/wiki/Rabin_fingerprint Rabin fingerprints] | + | * Approach: use [https://en.wikipedia.org/wiki/Rabin_fingerprint Rabin fingerprints] as in LBFS |
* Implementation: [https://forge.softwareheritage.org/source/snippets/browse/master/zack/swh-dedup/ swh-dedup-blocks.py] | * Implementation: [https://forge.softwareheritage.org/source/snippets/browse/master/zack/swh-dedup/ swh-dedup-blocks.py] | ||
Revision as of 14:03, 8 January 2018
Some experiments on deduplicating contents at sub-file granularity.
Datasets
Linux kernel, Git repo
- origin: git.kernel.org, on 2018-01-06
- 1.653.941 content blobs, for a total of 19 GB (compressed)
- original size (uncompressed): 55.89 GB
Rabin fingerprint chunking
- Approach: use Rabin fingerprints as in LBFS
- Implementation: swh-dedup-blocks.py
test 1
Dataset: linux.git
Rabin fingerprint parameters:
- prime: 3
- window_size: 48 KB
- chunk size (min/avg/max): 2 KB / 8 KB / 64 KB
Results:
- average chunk size (effective): 9.37 KB
- dedup chunk size (uncompressed): 19.87 GB (35.55%)
test 2
Dataset: linux.git
Rabin fingerprint parameters:
- prime: 3
- window_size: 48 KB
- chunk size (min/avg/max): 512 B / 2 KB / 8 KB
Results:
- average chunk size (effective): 2.86 KB
- dedup chunk size (uncompressed): 9.09 GB (16.26%)
test 3
Dataset: linux.git
Rabin fingerprint parameters:
- prime: 3
- window_size: 48 KB
- chunk size (min/avg/max): 512 B / 1 KB / 8 KB
Results:
- average chunk size (effective): 1.72 KB
- dedup chunk size (uncompressed): 6.49 GB (11.60%)