greg/pcompress
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity
292 commits 3 branches 21 tags 7.6 MiB
Commit graph

47 commits

Author SHA1 Message Date
Moinak Ghosh
fa78621cbf Cleanup pointer casting in code to use macros. 2013-09-22 20:11:15 +05:30
Moinak Ghosh
3db5188445 Support for deduplication using 2KB block size. 2013-08-19 13:38:52 +05:30
Moinak Ghosh
ef98422bd4 Add basic file format documentation. 
Reduce memory threshold for switching to Similarity based Deduplication.
 2013-08-18 20:11:20 +05:30
Moinak Ghosh
58f3113558 Avoid unnecessary re-hashing of 64-bit keys of the segment index. 2013-08-17 22:08:55 +05:30
Moinak Ghosh
2a218e9da5 Fix Dedupe Mode initialization. 2013-07-12 18:21:49 +05:30
Moinak Ghosh
6b67e98747 Reduce similarity indicators to reduce memory use with low impact on dedupe ratio. 2013-06-30 22:38:05 +05:30
Moinak Ghosh
c0dd0102a5 A few minor fixes. 2013-06-14 22:25:01 +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
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
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
2f2fc23771 Tweak index size computation. 2013-04-26 19:21:11 +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
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
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
Moinak Ghosh
3b8a5813fd Many optimizations to segmented global dedupe. 
Use chunk hash based cumulative similarity matching instead of chunk content.
 2013-04-19 22:51:51 +05:30
Moinak Ghosh
2f6ccca6e5 Update usage text and add minor tweaks. 2013-04-18 22:55:49 +05:30
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. 
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. 
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. 
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. 
Fix a compiler warning.
 2013-03-03 21:55:59 +05:30
Moinak Ghosh
5f6217bb1f Add lookup and insert functionality for global index. 
Make global dedupe code buildable.
 2013-02-21 23:07:07 +05:30
Moinak Ghosh
6badbcaea7 Make global dedupe bits buildable and fix errors. 
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
6c3173f929 Work in progress global dedupe config setup. 2012-11-29 22:28:50 +05:30
Moinak Ghosh
3b1d6b55fe Work in progress global dedupe config loader. 2012-11-19 21:41:56 +05:30