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subtree: performance improvement for finding unexpected parent commits 

After testing a previous patch at larger scale, a performance issue was
detected when using git show to locate parent revisions, with a single
run of the git show command taking 2 seconds or longer in a complex repo.
When the command is required tens or hundreds of times in a run of the
script, the additional wait time is unaccepatable. Replacing the command
with git rev-parse resulted in significantly increased performance, with
the command in question returning instantly.

Signed-off-by: Roger Strain <rstrain@swri.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Roger Strain 2018-10-12 08:52:18 -05:00 committed by Junio C Hamano
parent 68f8ff8151
commit 19ad68d95d
1 changed files with 1 additions and 1 deletions
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contrib/subtree/git-subtree.sh
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@ -633,7 +633,7 @@ process_split_commit () {
else
# processing commit without normal parent information;
# fetch from repo
parents=$(git show -s --pretty=%P "$rev")
parents=$(git rev-parse "$rev^@")
extracount=$(($extracount + 1))
fi