Moinak Ghosh
8ae571124d
Complete implementation for Segmented Global Deduplication.
2013-04-18 21:26:24 +05:30
Moinak Ghosh
a22b52cf08
Work in progress changes for Segmented Global Deduplication.
2013-04-14 23:51:54 +05:30
Moinak Ghosh
50251107de
Work in progress changes for Segmented Global Deduplication.
2013-04-09 22:23:51 +05:30
Moinak Ghosh
3d7a179a77
Work in progress changes for scalable segmented global deduplication.
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Allow user-specified environment setting to control in-memory index size.
2013-04-06 15:15:27 +05:30
Moinak Ghosh
c357452079
Implement global dedupe in pipe mode.
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Update hash index calculations to use upto 75% memavail when file size is not known.
Use little-endian nonce format for Salsa20.
2013-03-29 15:18:25 +05:30
Moinak Ghosh
19b304f30c
Add global index cleanup function.
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Fix location of sem_wait().
More comments.
2013-03-25 21:04:16 +05:30
Moinak Ghosh
fbf4658635
Implement Global Deduplication.
2013-03-24 23:21:17 +05:30
Moinak Ghosh
876796be5c
Work in progress changes for global dedupe.
2013-03-21 22:00:38 +05:30
Moinak Ghosh
b7fdeb08bc
Work in progress global dedupe changes.
2013-03-20 22:47:03 +05:30
Moinak Ghosh
f2806d4ffa
Work in progress global dedupe changes.
2013-03-19 20:13:44 +05:30
Moinak Ghosh
f8f23e5200
Major License text cleanup.
2013-03-07 20:26:48 +05:30
Moinak Ghosh
e16b408061
Move Scrypt helper function out of AES module.
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Fix a compiler warning.
2013-03-03 21:55:59 +05:30
Moinak Ghosh
5f6217bb1f
Add lookup and insert functionality for global index.
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Make global dedupe code buildable.
2013-02-21 23:07:07 +05:30
Moinak Ghosh
6badbcaea7
Make global dedupe bits buildable and fix errors.
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Rename Adaptive compression type constants to avoid conflict with global constants.
2013-02-17 21:05:40 +05:30
Moinak Ghosh
7386f82a4f
Work in progress global dedupe.
2013-02-16 23:33:06 +05:30
Moinak Ghosh
f89473d29c
Fixes for issues/warnings reported in issue #4 .
2013-02-15 22:53:17 +05:30
Moinak Ghosh
24d62bfde9
Global dedupe work in progress.
2013-02-14 23:10:53 +05:30
Moinak Ghosh
1eae57c8a2
Starting changes for single-file global dedupe.
2013-02-12 21:53:04 +05:30
Moinak Ghosh
3e1737b4ab
Use OpenMP parallelism when computing xxHashes for chunks.
2013-02-02 09:27:58 +05:30
Moinak Ghosh
af4c6e1d84
Reduce dedupe hash table collisions by half.
2013-01-31 00:38:41 +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
3888c8d316
Many optimization tweaks
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Optimize Rabin Deduplication and Bsdiff
Vectorize XXHash using SE4
2013-01-20 22:02:26 +05:30
Moinak Ghosh
455c8107d5
Use pre-increment for shorter instruction length and slight speed.
2013-01-17 22:54:30 +05:30
Moinak Ghosh
39dbc4be43
Implement algo-specific minimum distance match for Delta Compression.
2013-01-14 13:20:07 +05:30
Moinak Ghosh
d49a088eea
Fixes and performance improvements for Dedupe Delta Compression
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Avoid using fingerprints in minhash computation and fix write amplification
Modify min-heap to use 64bit values
Improve bsdiff performance
Fix pointer comparison in bsdiff
Use 32bit offsets in bsdiff to reduce memory usage
Improve Zero RLE Encoder performance
Add more buffer overflow checks in Zero RLE Decoder
2013-01-13 22:04:59 +05:30
Moinak Ghosh
d9eb82e0e8
Fix numeric parsing.
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Fix dedupe bug introduced in last commit.
Reset valid flag when resetting dedupe context.
Cleanup test suites.
Do not abort test suite on failure of a test case.
2013-01-03 00:27:18 +05:30
Moinak Ghosh
13d9378acd
Update to latest XXHash version.
2012-12-31 11:53:47 +05:30
Moinak Ghosh
28224d29d3
Improve Dedupe performance.
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Add more debug timing stats.
Change default checksum to Keccak 256 (SIMD version 4x faster than Skein).
Fix compiler warning in allocator code.
2012-12-29 23:43:41 +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
a43fdd7d2c
Improve Delta2 scanning speed and effectiveness.
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Add destination buffer overflow check in Delta2.
Add rough speed computation.
2012-12-23 00:44:56 +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
6c3173f929
Work in progress global dedupe config setup.
2012-11-29 22:28:50 +05:30
Moinak Ghosh
d250322490
Fix issues with error handling.
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Add new tests for out of range values and corrupted file.
2012-11-24 23:53:07 +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
3b1d6b55fe
Work in progress global dedupe config loader.
2012-11-19 21:41:56 +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
eacbf207aa
Tweak chunking parameters for better block size distribution and dedupe ratio.
2012-11-08 19:41:33 +05:30
Moinak Ghosh
e437390e53
Add some more debug mode info.
2012-11-07 22:55:14 +05:30
Moinak Ghosh
c5ebe1f30a
Portability to Debian based distros.
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Enable SSE4/AVX detection for AMD platforms (Bulldozer has both).
Portable long long int print formatting to silence gcc 4.6 warnings.
2012-10-21 21:03:07 +05:30
Moinak Ghosh
9475ccc3d6
Fix polynomial computation.
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Fix incorrect block length when doing fixed-block dedupe.
2012-10-02 00:20:44 +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
449dc35675
Speed up adaptive modes by using heuristics to select compression algorithm.
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Select similarity percentage based on dedupe block size for effectiveness.
2012-09-26 19:47:32 +05:30
Moinak Ghosh
333b7b011e
Fix check for size reduction in dedupe.
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Tweak debug message for clarity.
2012-09-25 23:24:33 +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
99a8e4cd98
Speed up Hash computation for dedupe blocks.
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Add missing initialization of sliding window.
Update help text.
2012-09-19 20:29:44 +05:30