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Jgit diff is slow as compared to git diff commandline [message #1841580]

Fri, 21 May 2021 07:33

Pallavi Agarwal

Messages: 5
Registered: May 2021

Junior Member

We are using jgit to compute diff between two commits of a given repo using DiffFormatter, the code looks like below

diffFormatter.scan(parentCommit?.tree, childCommit.tree)

where parentCommit and childCommit are two RevCommit objects.

We noticed that if a commit is big or contains pdf file or for some binary file changes.

We have set timeout of 1minute, which is quite big time for git diff operation and timing out on this looks some bug.

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Re: Jgit diff is slow as compared to git diff commandline [message #1841611 is a reply to message #1841580]

Sat, 22 May 2021 07:51

Thomas Wolf

Messages: 576
Registered: August 2016

Senior Member

Might perhaps be the rename detection. There was a change in JGit enabling switching rename detection (based on content similarity) off for files larger than a certain threshold (by default 50Mb), and there is a pending change for switching it off for binary files.

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Re: Jgit diff is slow as compared to git diff commandline [message #1841632 is a reply to message #1841611]

Mon, 24 May 2021 04:36

Pallavi Agarwal

Messages: 5
Registered: May 2021

Junior Member

I see the time is also taken by jgit diff ` git.diff().setOldTree(getCanonicalTreeParser(repository, parentCommit!!))
.setNewTree(getCanonicalTreeParser(repository, childCommit))
.call()`

Also the formatting take huge time where the commit is deletion of many files.

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Re: Jgit diff is slow as compared to git diff commandline [message #1841633 is a reply to message #1841632]

Mon, 24 May 2021 04:39

Pallavi Agarwal

Messages: 5
Registered: May 2021

Junior Member

I am trying to set notTreeFilter in Path Filter and looks like some bug there. It is ignoring all java files in a commit when I simply do
` .setPathFilter(PathSuffixFilter.create(".txt").negate())
`
I want to include all files which are not txt file in commit.

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