Moinak Ghosh
24d62bfde9
Global dedupe work in progress.
2013-02-14 23:10:53 +05:30
Moinak Ghosh
3e1737b4ab
Use OpenMP parallelism when computing xxHashes for chunks.
2013-02-02 09:27:58 +05:30
Moinak Ghosh
3d8f3ada1c
Improve Deduplication performance by another 95%.
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Start sliding window scanning near minimum chunk size boundaries to avoid scanning whole chunk.
2013-01-30 22:41:13 +05:30
Moinak Ghosh
5c8704c5bb
Improve Deduplication throughtput by 90%.
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Use SSE4 register as sliding window for default 16-byte window size.
Use local variable for sliding window position to avoid spurios memory access in non-SIMD case.
Avoid computing breakpoint check value if processed length < minimum block length.
2013-01-22 15:54:42 +05:30
Moinak Ghosh
39dbc4be43
Implement algo-specific minimum distance match for Delta Compression.
2013-01-14 13:20:07 +05:30
Moinak Ghosh
26a4f42506
Introduce strict compiler flags and fix scores of warnings/issues.
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Avoid different optimization flags for Dedupe sources.
Fix liberal mixing of uint64_t and int64_t (should all be uint64_t).
Fix corner case crash when decompressing.
2012-12-27 23:06:48 +05:30
Moinak Ghosh
224fb529e9
Get rid of size_t in places where 64-bitness is assumed.
2012-12-09 10:15:06 +05:30
Moinak Ghosh
d054e0f713
Zlib optimizations. Use raw deflate streams to avoid unnecessary adler32.
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Change some function signatures to improve algo init function behavior.
Fix corner case dedupe bug in error handling flow.
Bump archive version signature.
2012-11-22 21:02:50 +05:30
Moinak Ghosh
393ced991a
A couple of minor cleanups.
2012-11-18 20:20:16 +05:30
Moinak Ghosh
b2cbf0699e
Use fixed rolling-hash mask for better block size approximation.
2012-11-11 14:58:39 +05:30
Moinak Ghosh
0019efbadb
Adjust break pattern check mask for closer approximation to average block size.
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Remove unused structure member.
2012-09-29 23:31:45 +05:30
Moinak Ghosh
24e6f4e629
Switch to multiplicative rolling hash for good distribution properties.
2012-09-29 00:09:49 +05:30
Moinak Ghosh
8f8af7ed6b
Update adaptive mode heuristic based on algorithms.
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Remove incorrect check in PPMd decompression code.
More refactoring of variable names.
2012-09-27 22:29:08 +05:30
Moinak Ghosh
3544a8c708
Fix polynomial table computation.
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Change hashing and length bias to reduce hashtable bucket collisions.
Add support for user-selectable 60% or 40% similarity for Delta Compression.
Overall slight speedup.
2012-09-24 22:20:27 +05:30
Moinak Ghosh
8386e72566
Rewrite core dedupe logic to simplify code and improve performance.
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Hashtable based chunk-level deduplication instead of Quicksort.
Fix a corner case bug in Dedupe decompression.
2012-09-23 14:57:09 +05:30
Moinak Ghosh
e3befd9e16
Add support for Fixed-Block deduplication.
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More refactoring of symbol names.
2012-09-16 11:12:58 +05:30
Moinak Ghosh
b9355a5dcc
Reduce dedupe loop checks for slight speed edge.
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Beginnings of Fixed-block dedupe.
Update variable name for clarity.
2012-09-15 11:14:58 +05:30
Moinak Ghosh
560fa85aab
Fix secondary sketch computation, some more accuracy in diff detection.
2012-09-04 23:28:02 +05:30
Moinak Ghosh
262566b59a
Add xxHash for Rabin block checksums, slightly faster than CRC64.
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Fix missing initialization of character counts table.
Some file reorganization.
2012-09-02 20:40:32 +05:30
