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authorLibravatar Derrick Stolee <dstolee@microsoft.com>2018-04-06 19:09:46 +0000
committerLibravatar Junio C Hamano <gitster@pobox.com>2018-04-11 10:47:16 +0900
commit7b8a21dba1bce44d64bd86427d3d92437adc4707 (patch)
treee45261ae8a002fdd4bab8ffc632740b5cee55c8c /Documentation
parenttreewide: replace maybe_tree with accessor methods (diff)
downloadtgif-7b8a21dba1bce44d64bd86427d3d92437adc4707.tar.xz
commit-graph: lazy-load trees for commits
The commit-graph file provides quick access to commit data, including the OID of the root tree for each commit in the graph. When performing a deep commit-graph walk, we may not need to load most of the trees for these commits. Delay loading the tree object for a commit loaded from the graph until requested via get_commit_tree(). Do not lazy-load trees for commits not in the graph, since that requires duplicate parsing and the relative peformance improvement when trees are not needed is small. On the Linux repository, performance tests were run for the following command: git log --graph --oneline -1000 Before: 0.92s After: 0.66s Rel %: -28.3% Adding '-- kernel/' to the command requires loading the root tree for every commit that is walked. There was no measureable performance change as a result of this patch. Signed-off-by: Derrick Stolee <dstolee@microsoft.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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