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Author SHA1 Message Date
Moinak Ghosh
e732e86b91 New option to capture statistics for all rolling hash breakpoints. 2013-06-23 21:30:32 +05:30
Moinak Ghosh
84944932b0 Add more statistics. 2013-06-22 23:54:54 +05:30
Moinak Ghosh
b8f4a5d411 Compute rolling hash coverage metrics. 2013-06-20 23:57:18 +05:30
Moinak Ghosh
916f31d62b Add measurements for Chunking properties. 2013-06-20 22:08:07 +05:30
Moinak Ghosh
6432c76b4b Update README formatting yet again - ugh. 2013-06-16 21:12:04 +05:30
Moinak Ghosh
52723cbbac Update README formatting. 2013-06-16 21:09:04 +05:30
Moinak Ghosh
92be5a17f0 Update README with pointers to relevant analysis and documentation. 2013-06-16 20:46:17 +05:30
Moinak Ghosh
c0dd0102a5 A few minor fixes. 2013-06-14 22:25:01 +05:30
Moinak Ghosh
63370caee9 Remove an rpath entry meant for testing. 2013-06-03 21:28:20 +05:30
Moinak Ghosh
7743792018 Make default symbol visibility to hidden with explicit public visibility specified. 
Add missing static scope to a few more places.
 2013-06-03 20:51:00 +05:30
Moinak Ghosh
c859cf35d5 Make Pcompress functionality into a library - initial changes. 2013-06-02 20:54:33 +05:30
Moinak Ghosh
8db0bef184 Bump version and update Changelog for 2.2 release. 2013-05-28 21:45:19 +05:30
Moinak Ghosh
ab1ced942d Update invalid environment variable handling to actually fail rather than auto-correct. 2013-05-28 21:38:35 +05:30
Moinak Ghosh
e9ce7a5ed2 Fix a crash with invalid PCOMPRESS_CHUNK_HASH_GLOBAL. 
Update testcase to correctly detect core files.
 2013-05-26 23:38:10 +05:30
Moinak Ghosh
ddaa3b6b6d Drastic simplification of Min-heap code and resultant Delta speedup. 2013-05-25 17:34:38 +05:30
Moinak Ghosh
0a1e3b39ef Correspond segment size to chunk size for Segmented Dedupe for better accuracy. 2013-05-15 22:20:45 +05:30
Moinak Ghosh
d89c95225a Add a testcase for issue #10. 2013-05-12 14:19:26 +05:30
Moinak Ghosh
cbc0c84b12 Fix issue #10. 2013-05-12 11:54:40 +05:30
Moinak Ghosh
41b036adac Fix issue #8. 2013-05-10 19:51:24 +05:30
Moinak Ghosh
8b3761ee81 Update Changelog, docs and bump version for 2.1 release. 2013-05-09 18:53:11 +05:30
Moinak Ghosh
a755d59dff Add more tests covering Segmented Global Dedupe. 
Fix some tests.
 2013-05-07 22:30:36 +05:30
Moinak Ghosh
2740a00c76 Switch location of Dedupe context creation to allow correct index memory sizing. 2013-05-07 20:50:13 +05:30
Moinak Ghosh
969e242b31 Update README with details of Global Dedupe block hash selection. 2013-05-06 23:50:56 +05:30
Moinak Ghosh
c27317d7da Add SSE2 optimizations for Segmented Dedupe. 2013-05-05 23:34:26 +05:30
Moinak Ghosh
6ecc400571 Fix segment offset sorting. 
Get rid of incorrect duplicate checks in index.
 2013-05-05 18:50:52 +05:30
Moinak Ghosh
c6da2325e3 Allow SKEIN to be used as a Global Dedupe chunk lookup hash. 2013-05-04 15:59:29 +05:30
Moinak Ghosh
0cf94c308a Add a qsort variant optimized for integers and use in global dedupe. 
Cleanup LZMA CRC64/32 declarations and add a header.
Fix heapq header.
 2013-05-03 22:06:55 +05:30
Moinak Ghosh
c43e99f422 Use openmp parallelism always for chunk hash computation during Global Dedupe. 2013-05-02 23:24:43 +05:30
Moinak Ghosh
120877348c Use SHA256 for Global Dedupe chunk lookup hash by default. 
Allow changing Global Dedupe chunk lookup hash via env variable.
 2013-05-02 00:05:05 +05:30
Moinak Ghosh
6e4d45b644 Fix crash with some older GCC versions. Reported in issue #7. 2013-05-01 19:27:43 +05:30
Moinak Ghosh
eae16b82d3 Fix issue #7. 
Ensure tempfile cleanup even with error abort.
 2013-05-01 18:01:17 +05:30
Moinak Ghosh
b23b5789fb Fix bugs and improve accuracy in Segmented Dedupe. 
Fix segment hashlist size computation.
Remove unnecessary sync of segment hashlist file writes.
Pass correct number of threads to index creation routine.
Add more error checks.
Handle correct positioning of segment hashlist file offset on write error.
Add missing semaphore signaling at dedupe abort points with global dedupe.
Use closer min-values sampling for improved segmented dedupe accuracy.
Update proper checksum info in README.
 2013-04-30 19:35:18 +05:30
Moinak Ghosh
074e265f70 Fix sizing of similarity hash buffer. 2013-04-26 22:36:14 +05:30
Moinak Ghosh
2f2fc23771 Tweak index size computation. 2013-04-26 19:21:11 +05:30
Moinak Ghosh
c4f3bd14c0 Update Changelog for 2.0 release. 2013-04-26 19:04:35 +05:30
Moinak Ghosh
f05c7905b2 Bump version for release. 2013-04-26 18:47:52 +05:30
Moinak Ghosh
eb964b0bde Update README. 2013-04-26 18:46:14 +05:30
Moinak Ghosh
aed69b2d53 Add test cases for Global Deduplication. 
Update documentation and code comments.
Remove tempfile pathname after creation to ensure clean removal after process exit.
 2013-04-26 18:32:00 +05:30
Moinak Ghosh
75f62d6a36 Simplify segment lookup loop. 
Fix assertion.
 2013-04-26 10:56:29 +05:30
Moinak Ghosh
5bb028fe03 Change Segmented Dedupe flow to improve parallelism. 
Periodically sync writes to segcache file.
Use simple insertion sort for small numbers of elements.
 2013-04-25 23:42:32 +05:30
Moinak Ghosh
79a6e7f770 Capability to output data to stdout when compressing. 
Always use segmented similarity bases dedupe when using -G option in pipe mode.
Standardize on average 8MB segment size for segmented dedupe.
Fix hashtable sizing.
Some miscellaneous cleanups.
Update README with details of new features.
 2013-04-24 23:03:58 +05:30
Moinak Ghosh
6c5d8d9e18 Optimize index lookup for 8-byte keys. 
More cleanups.
 2013-04-24 19:49:43 +05:30
Moinak Ghosh
5d6ffd969d More tweaks to slightly improve segment dedupe efficiency. 
Use on average 8MB segments for all cases.
Some minor cleanps.
 2013-04-24 19:13:07 +05:30
Moinak Ghosh
eabd670790 Improve segment similarity detection and drastically reduce index size. 2013-04-23 23:15:32 +05:30
Moinak Ghosh
b32f4b3f9a Improve duplicate segment match detection. 2013-04-23 20:51:12 +05:30
Moinak Ghosh
6b7d883393 Tweak percentage intervals computation to improve segmented dedupe ratio. 
Avoid repeat processing of already processed segments.
 2013-04-23 18:53:56 +05:30
Moinak Ghosh
d29f125ca7 Clean up temp cache dir handling. 
Allow temp dir setting via specific env variable to point to fast devices like ramdisk,ssd.
 2013-04-22 22:57:31 +05:30
Moinak Ghosh
2c4024792a Several bugfixes. 
Avoid matching with self during hash lookup.
 2013-04-22 22:07:07 +05:30
Moinak Ghosh
6b23f6a73a Several fixes and optimizations. 2013-04-22 19:52:18 +05:30
Moinak Ghosh
c0b4aa0116 Many optimizations and changes to Segmented Global Dedupe. 
Use chunk hash based similarity matching rather than content based.
Use sorting to order hash buffer rather than min-heap for better accuracy.
Use fast CRC64 for similarity hash for speed and lower memory requirements.
 2013-04-21 18:11:16 +05:30