Performance regression in Gitea 1.14 for large diffs #7455

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GiteaMirror · 2025-11-02T07:26:21-06:00

GiteaMirror commented

2025-11-02 07:26:21 -06:00

Originally created by @jpraet on GitHub (Jun 10, 2021).

Gitea version (or commit ref): 1.14.2
Operating system: docker on RHEL 7.7

Due to #13949 when you want to create a PR for backporting a change to a release branch, gitea first calculates the diff against the master branch. If the branches have diverged a lot this diff can be quite large, and the processing and rendering can take a very long time. This was already quite slow on Gitea 1.13, but on Gitea 1.14 it got significantly slower.

Gitea 1.14.2:
2021/06/09 16:28:03 Completed GET /CBSS/cics/compare/master...release/10.2 200 OK in 2m15.325931649s

Same with Gitea 1.13.4:
2021-06-09 16:04:19: Completed GET /CBSS/cics/compare/master...release/10.2 200 OK in 46.343604847s

It looks like the performance has already improved again on the latest 1.15 dev version:
2021/06/10 16:00:08 Completed GET /CBSS/cics/compare/master...release/10.2 200 OK in 34.828378582s

This diff is pretty large: 375 changed files with 22643 additions and 25134 deletions.

I noticed there are other tickets about performance issues with 1.14, but they seem to be related to Windows, or to repo browsing.

Originally created by @jpraet on GitHub (Jun 10, 2021). - Gitea version (or commit ref): 1.14.2 - Operating system: docker on RHEL 7.7 Due to #13949 when you want to create a PR for backporting a change to a release branch, gitea first calculates the diff against the master branch. If the branches have diverged a lot this diff can be quite large, and the processing and rendering can take a very long time. This was already quite slow on Gitea 1.13, but on Gitea 1.14 it got significantly slower. Gitea 1.14.2: 2021/06/09 16:28:03 Completed GET /CBSS/cics/compare/master...release/10.2 200 OK in 2m15.325931649s Same with Gitea 1.13.4: 2021-06-09 16:04:19: Completed GET /CBSS/cics/compare/master...release/10.2 200 OK in 46.343604847s It looks like the performance has already improved again on the latest 1.15 dev version: 2021/06/10 16:00:08 Completed GET /CBSS/cics/compare/master...release/10.2 200 OK in 34.828378582s This diff is pretty large: 375 changed files with 22643 additions and 25134 deletions. I noticed there are other tickets about performance issues with 1.14, but they seem to be related to Windows, or to repo browsing.

GiteaMirror added the performance/speed label 2025-11-02 07:26:21 -06:00

GiteaMirror closed this issue

2025-11-02 07:26:21 -06:00

GiteaMirror commented

2025-11-02 07:26:22 -06:00

@jpraet commented on GitHub (Jun 10, 2021):

I will try to identify the commit that improved the performance on 1.15.

@jpraet commented on GitHub (Jun 10, 2021): I will try to identify the commit that improved the performance on 1.15.

GiteaMirror commented

2025-11-02 07:26:22 -06:00

@jpraet commented on GitHub (Jun 10, 2021):

It's #15667. Could it be backported to 1.14? /cc @zeripath