21a925dcf1
Before, a merge was first calculated, by running various actions that called git and built up a list of lines, which were at the end sent to git update-index. This necessarily used space proportional to the size of the diff between the trees being merged. Now, lines are streamed into git update-index from each of the actions in turn. Runtime size of git-annex merge when merging 50000 location log files drops from around 100 mb to a constant 4 mb. Presumably it runs quite a lot faster, too. |
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