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git-svn: improve rebase/mkdirs performance
Processing empty_dir directives becomes extremely slow for svn repositories with a large enough history. This is due to using a single hash to store the list of empty directories, with the expensive step being purging items from that hash using grep+delete. Storing directories in a hash of hashes improves the performance of this purge step and removes a potentially lengthy delay after every rebase/mkdirs command. The svn repository with this behaviour has 110K commits with unhandled.log containing 170K empty_dir directives. This takes 10 minutes to process when using a single hash, vs 3 seconds with a hash of hashes. Signed-off-by: Dair Grant <dair@feralinteractive.com> Signed-off-by: Eric Wong <normalperson@yhbt.net>
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Dair Grant
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Eric Wong
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Nov 10, 2015
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