jenkinsci / jenkinsci/junit-plugin

[JENKINS-10175] "Recording test results" is super slow, what is it doing?

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#898 10 comments 0 reactions 0 assignees View on GitHub
component:junit-plugin enhancement imported-jira-issue performance priority:major resolution:unresolved
Dominant language
Java
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Forks
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1d 19h
Merged PRs (30d)
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Description

After a successful build I see

Recording test results

It then takes ages to do whatever its doing, sometime spending another 10 minutes shuffling away.

Here is a threadDump:

java.io.WinNTFileSystem.list(Native Method)

java.io.File.list(File.java:937)

org.apache.tools.ant.DirectoryScanner.scandir(DirectoryScanner.java:1230)

org.apache.tools.ant.DirectoryScanner.scandir(DirectoryScanner.java:1259)

org.apache.tools.ant.DirectoryScanner.scandir(DirectoryScanner.java:1259)

org.apache.tools.ant.DirectoryScanner.scandir(DirectoryScanner.java:1259)

org.apache.tools.ant.DirectoryScanner.scandir(DirectoryScanner.java:1259)

org.apache.tools.ant.DirectoryScanner.scandir(DirectoryScanner.java:1259)

org.apache.tools.ant.DirectoryScanner.scandir(DirectoryScanner.java:1259)

org.apache.tools.ant.DirectoryScanner.scandir(DirectoryScanner.java:1259)

org.apache.tools.ant.DirectoryScanner.scandir(DirectoryScanner.java:1259)

org.apache.tools.ant.DirectoryScanner.scandir(DirectoryScanner.java:1259)

org.apache.tools.ant.DirectoryScanner.scandir(DirectoryScanner.java:1259)

org.apache.tools.ant.DirectoryScanner.scandir(DirectoryScanner.java:1259)

org.apache.tools.ant.DirectoryScanner.scandir(DirectoryScanner.java:1259)

org.apache.tools.ant.DirectoryScanner.scandir(DirectoryScanner.java:1259)

org.apache.tools.ant.DirectoryScanner.scandir(DirectoryScanner.java:1184)

org.apache.tools.ant.DirectoryScanner.checkIncludePatterns(DirectoryScanner.java:1003)

org.apache.tools.ant.DirectoryScanner.scan(DirectoryScanner.java:882)

org.apache.tools.ant.types.AbstractFileSet.getDirectoryScanner(AbstractFileSet.java:490)

org.apache.tools.ant.types.AbstractFileSet.getDirectoryScanner(AbstractFileSet.java:451)

hudson.tasks.junit.JUnitParser$ParseResultCallable.invoke(JUnitParser.java:105)

hudson.tasks.junit.JUnitParser$ParseResultCallable.invoke(JUnitParser.java:87)

hudson.FilePath.act(FilePath.java:758)

hudson.FilePath.act(FilePath.java:740)

hudson.tasks.junit.JUnitParser.parse(JUnitParser.java:83)

hudson.tasks.junit.JUnitResultArchiver.parse(JUnitResultArchiver.java:123)

hudson.tasks.junit.JUnitResultArchiver.perform(JUnitResultArchiver.java:135)

hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:19)

hudson.model.AbstractBuild$AbstractRunner.perform(AbstractBuild.java:664)

hudson.model.AbstractBuild$AbstractRunner.performAllBuildSteps(AbstractBuild.java:639)

hudson.model.AbstractBuild$AbstractRunner.performAllBuildSteps(AbstractBuild.java:617)

hudson.model.Build$RunnerImpl.post2(Build.java:161)

hudson.model.AbstractBuild$AbstractRunner.post(AbstractBuild.java:586)

hudson.model.Run.run(Run.java:1400)

hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46)

hudson.model.ResourceController.execute(ResourceController.java:88)

hudson.model.Executor.run(Executor.java:146)

Any chance it could be speeded up? A build which takes 23 minutes ends up taking 33 just because we'd like it to show the junit results, but this seems excessive. We have about 2000 unit tests. Is this a lot?

Thanks.

---
Originally reported by fancellu, imported from: "Recording test results" is super slow, what is it doing?


  • status: Open
  • priority: Major
  • component(s): junit-plugin
  • label(s): performance
  • resolution: Unresolved
  • votes: 9
  • watchers: 16
  • imported: 2025-11-26

Raw content of original issue

After a successful build I see



Recording test results



It then takes ages to do whatever its doing, sometime spending another 10 minutes shuffling away.



Here is a threadDump:



java.io.WinNTFileSystem.list(Native Method)

java.io.File.list(File.java:937)

org.apache.tools.ant.DirectoryScanner.scandir(DirectoryScanner.java:1230)

org.apache.tools.ant.DirectoryScanner.scandir(DirectoryScanner.java:1259)

org.apache.tools.ant.DirectoryScanner.scandir(DirectoryScanner.java:1259)

org.apache.tools.ant.DirectoryScanner.scandir(DirectoryScanner.java:1259)

org.apache.tools.ant.DirectoryScanner.scandir(DirectoryScanner.java:1259)

org.apache.tools.ant.DirectoryScanner.scandir(DirectoryScanner.java:1259)

org.apache.tools.ant.DirectoryScanner.scandir(DirectoryScanner.java:1259)

org.apache.tools.ant.DirectoryScanner.scandir(DirectoryScanner.java:1259)

org.apache.tools.ant.DirectoryScanner.scandir(DirectoryScanner.java:1259)

org.apache.tools.ant.DirectoryScanner.scandir(DirectoryScanner.java:1259)

org.apache.tools.ant.DirectoryScanner.scandir(DirectoryScanner.java:1259)

org.apache.tools.ant.DirectoryScanner.scandir(DirectoryScanner.java:1259)

org.apache.tools.ant.DirectoryScanner.scandir(DirectoryScanner.java:1259)

org.apache.tools.ant.DirectoryScanner.scandir(DirectoryScanner.java:1259)

org.apache.tools.ant.DirectoryScanner.scandir(DirectoryScanner.java:1184)

org.apache.tools.ant.DirectoryScanner.checkIncludePatterns(DirectoryScanner.java:1003)

org.apache.tools.ant.DirectoryScanner.scan(DirectoryScanner.java:882)

org.apache.tools.ant.types.AbstractFileSet.getDirectoryScanner(AbstractFileSet.java:490)

org.apache.tools.ant.types.AbstractFileSet.getDirectoryScanner(AbstractFileSet.java:451)

hudson.tasks.junit.JUnitParser$ParseResultCallable.invoke(JUnitParser.java:105)

hudson.tasks.junit.JUnitParser$ParseResultCallable.invoke(JUnitParser.java:87)

hudson.FilePath.act(FilePath.java:758)

hudson.FilePath.act(FilePath.java:740)

hudson.tasks.junit.JUnitParser.parse(JUnitParser.java:83)

hudson.tasks.junit.JUnitResultArchiver.parse(JUnitResultArchiver.java:123)

hudson.tasks.junit.JUnitResultArchiver.perform(JUnitResultArchiver.java:135)

hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:19)

hudson.model.AbstractBuild$AbstractRunner.perform(AbstractBuild.java:664)

hudson.model.AbstractBuild$AbstractRunner.performAllBuildSteps(AbstractBuild.java:639)

hudson.model.AbstractBuild$AbstractRunner.performAllBuildSteps(AbstractBuild.java:617)

hudson.model.Build$RunnerImpl.post2(Build.java:161)

hudson.model.AbstractBuild$AbstractRunner.post(AbstractBuild.java:586)

hudson.model.Run.run(Run.java:1400)

hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46)

hudson.model.ResourceController.execute(ResourceController.java:88)

hudson.model.Executor.run(Executor.java:146) 



Any chance it could be speeded up? A build which takes 23 minutes ends up taking 33 just because we'd like it to show the junit results, but this seems excessive. We have about 2000 unit tests. Is this a lot?



Thanks.

Contributor guide

Open the contributing guide

Research direction

Start with the JUnitParser.java stack entry and the JUnitResultArchiver.java call path, then inspect the Apache Ant DirectoryScanner activity shown in the thread dump. Reproduce the delay with a build containing many test results and identify a measurable improvement in result-recording time without changing the published results.

Written by the indexing model from the issue text.

Assessment

Tech stack
java
Domain
performance, testing-qa
Issue type
Feature
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
32/100

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