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[JGIT PATCH 22/23] Don't cut off existing delta chains if we are reusing deltas

From
Shawn O. Pearce <spearce@spearce.org>
Date
Dec 25, 2008, 02:11 UTC
Message-ID
<1230171079-17156-23-git-send-email-spearce@spearce.org>
In-Reply-To
<1230171079-17156-22-git-send-email-spearce@spearce.org>

The existing pack file may have chains longer than our current max depth, such as if it is a historical pack and was generated with a maximum chain depth >100. Cutting off the chains would create a bigger pack file that we need to transmit, and it costs a lot more CPU time to expand the delta object in order to recompress it whole, because we couldn't copy it directly from the pack file.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
---
 .../src/org/spearce/jgit/lib/PackWriter.java       |    6 ------
 1 files changed, 0 insertions(+), 6 deletions(-)
diff --git a/org.spearce.jgit/src/org/spearce/jgit/lib/PackWriter.java b/org.spearce.jgit/src/org/spearce/jgit/lib/PackWriter.java
index 69b4294..4c01b6e 100644
--- a/org.spearce.jgit/src/org/spearce/jgit/lib/PackWriter.java
+++ b/org.spearce.jgit/src/org/spearce/jgit/lib/PackWriter.java
@@ -681,12 +681,6 @@ private void writeObject(final ObjectToPack otp) throws IOException {
 					writeObject(deltaBase);
 				}
 			}
-
-			otp.updateDeltaDepth();
-			if (otp.getDeltaDepth() > maxDeltaDepth) {
-				otp.clearDeltaBase();
-				otp.disposeLoader();
-			}
 		}
 
 		assert !otp.isWritten();

-- 
1.6.1.rc4.301.g5497a
Previous: Shawn O. PearceNext: Shawn O. Pearce
Message 23 of 26 in “Misc. performance tweaks”
  1. 00/18 Misc. performance tweaksShawn O. Pearce, Dec 25, 2008
  2. 01/23 Improve hit performance on the UnpackedObjectCacheShawn O. Pearce, Dec 25, 2008
  3. 02/23 Add MutableObjectId.clear() to set the id to zeroIdShawn O. Pearce, Dec 25, 2008
  4. 03/23 Allow TreeWalk callers to pass a MutableObjectId to get the current idShawn O. Pearce, Dec 25, 2008
  5. 04/23 Switch ObjectWalk to use the new MutableObjectId form in TreeWalkShawn O. Pearce, Dec 25, 2008
  6. 05/23 Change walker based fetch to use TreeWalk's MutableObjectId accessorShawn O. Pearce, Dec 25, 2008
  7. 06/23 Reduce garbage allocation when using TreeWalkShawn O. Pearce, Dec 25, 2008
  8. 07/23 Switch ObjectWalk to use a naked CanonicalTreeParser because its fasterShawn O. Pearce, Dec 25, 2008
  9. 08/23 Remove the unused PackFile.get(ObjectId) formShawn O. Pearce, Dec 25, 2008
  10. 09/23 Remove getId from ObjectLoader API as its unnecessary overheadShawn O. Pearce, Dec 25, 2008
  11. 10/23 Make mmap mode more reliable by forcing GC at the correct spotShawn O. Pearce, Dec 25, 2008
  12. 11/23 Rewrite WindowCache to use a hash tableShawn O. Pearce, Dec 25, 2008
  13. 12/23 Change ByteArrayWindow to read content outside of WindowCache's lockShawn O. Pearce, Dec 25, 2008
  14. 13/23 Dispose of RevCommit buffers when they aren't used in PackWriterShawn O. Pearce, Dec 25, 2008
  15. 14/23 Don't unpack delta chains while writing a pack from a pack v1 indexShawn O. Pearce, Dec 25, 2008
  16. 15/23 Don't unpack delta chains while converting delta to whole objectShawn O. Pearce, Dec 25, 2008
  17. 16/23 Defer parsing of the ObjectId while walking a PackIndex IteratorShawn O. Pearce, Dec 25, 2008
  18. 17/23 Only do one getCachedBytes per whole object writtenShawn O. Pearce, Dec 25, 2008
  19. 18/23 Correctly use a long for the offsets within a generated packShawn O. Pearce, Dec 25, 2008
  20. 19/23 Allow more direct access to determine isWrittenShawn O. Pearce, Dec 25, 2008
  21. 20/23 Move "wantWrite" field of ObjectToPack into the flags fieldShawn O. Pearce, Dec 25, 2008
  22. 21/23 Use an ArrayList for the reuseLoader collection in PackWriterShawn O. Pearce, Dec 25, 2008
  23. 22/23 Don't cut off existing delta chains if we are reusing deltasShawn O. Pearce, Dec 25, 2008
  24. 23/23 Correctly honor the thin parameter to PackWriter.writePackShawn O. Pearce, Dec 25, 2008
  25. Robin RosenbergDec 27, 2008
  26. 11/23 Rewrite WindowCache to use a hash tableShawn O. Pearce, Dec 27, 2008

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