Diff for "RevlogSyncFlushProposal"

Differences between revisions 4 and 5

Compressing revlog delta chunks reusing the zlib stream

Current revlog format compresses delta chunks separately from each other. The idea is using the same compression object for a snapshot and its delta chunks, simply sync-flushing the zlib stream for each chunk.

Test results

Mercurial crew (http://hg.intevation.org/mercurial/crew) - 10395 revisions
	total size (kb)	relative size (plain == 1)	00manifest.d size (kb)	00manifest.d relative size (plain == 1)
plain	25708	1.00	8632	1.00
zlibstream applied	18400	0.72	4104	0.48
plain, shrinked manifest	21740	0.85	4668	0.54
zlibstream applied, shrinked manifest	16856	0.66	2560	0.30

Patch queue

The code currently doesn't properly sets and checks the requires file, and the changes on revlog chunks take effect immediately on any new revisions: take care when running this on existing repositories!

http://bitbucket.org/wbruna/hg-zlibstream/

Mailing list threads

http://www.selenic.com/pipermail/mercurial-devel/2010-February/018564.html

-  ⇤ ← Revision 4 as of 2010-02-09 18:02:32 → 
  Size: 1301
  Editor: WagnerBruna
  Comment: matches better the page intent
+   ← Revision 5 as of 2010-02-09 18:04:15 → ⇥
  Size: 1294
  Editor: WagnerBruna
  Comment:
-Deletions are marked like this.
+Additions are marked like this.
 Line 4:
-Current revlog format compresses delta chunks separately from each other. The idea is to use the same compression object for a snapshot chunk and its delta chunks, simply sync-flushing the zlib stream for each chunk.
+Current revlog format compresses delta chunks separately from each other. The idea is using the same compression object for a snapshot and its delta chunks, simply sync-flushing the zlib stream for each chunk.