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https://issues.apache.org/jira/browse/MNG-6311?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16594231#comment-16594231
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Sylwester Lachiewicz commented on MNG-6311:
-------------------------------------------
Test with [~dchr] patch on the public spring-boot project (pre-warmed with mvn
clean to download all dependencies)
{noformat}
c:\p\spring-boot>\programs\apache-maven-3.5.4\bin\mvn clean
1080 [INFO] org.apache.maven.cli.event.ExecutionEventLogger - Scanning for
projects...
18247 [WARNING] org.apache.maven.DefaultMaven - The project
org.springframework.boot:spring-boot-parent:pom:2.1.0.BUILD-SNAPSHOT [..]
18280 [INFO] org.apache.maven.cli.event.ExecutionEventLogger -
------------------------------------------------------------------------
18296 [INFO] org.apache.maven.cli.event.ExecutionEventLogger - Reactor Build
Order:
18315 [INFO] org.apache.maven.cli.event.ExecutionEventLogger -
18323 [INFO] org.apache.maven.cli.event.ExecutionEventLogger - Spring Boot
Build [pom]
...
31813 [INFO] org.apache.maven.cli.event.ExecutionEventLogger - Total time:
30.753 s
31829 [INFO] org.apache.maven.cli.event.ExecutionEventLogger - Finished at:
2018-08-27T23:05:53+02:00
31841 [INFO] org.apache.maven.cli.event.ExecutionEventLogger -
------------------------------------------------------------------------
{noformat}
{noformat}
c:\p\spring-boot>\programs\apache-maven-3.6.0-6311\bin\mvn clean
1199 [INFO] org.apache.maven.cli.event.ExecutionEventLogger - Scanning for
projects...
4902 [WARNING] org.apache.maven.DefaultMaven - The project
org.springframework.boot:spring-boot-parent:pom:2.1.0.BUILD-SNAPSHOT [..]
4926 [INFO] org.apache.maven.cli.event.ExecutionEventLogger -
------------------------------------------------------------------------
4932 [INFO] org.apache.maven.cli.event.ExecutionEventLogger - Reactor Build
Order:
4936 [INFO] org.apache.maven.cli.event.ExecutionEventLogger -
4941 [INFO] org.apache.maven.cli.event.ExecutionEventLogger - Spring Boot Build
[pom]
...
16102 [INFO] org.apache.maven.cli.event.ExecutionEventLogger - Total time:
14.927 s
16121 [INFO] org.apache.maven.cli.event.ExecutionEventLogger - Finished at:
2018-08-27T23:07:26+02:00
16131 [INFO] org.apache.maven.cli.event.ExecutionEventLogger -
------------------------------------------------------------------------{noformat}
Without the patch, the initial scan takes *17,1sec* and with the patch applied
- only *3,7sec*
[~tnikolay] could help us with testing and try build maven from
[https://github.com/slachiewicz/maven/tree/fix/MNG-6311] and share results?
> Maven intolerably slow when import scope used heavily in large project
> ----------------------------------------------------------------------
>
> Key: MNG-6311
> URL: https://issues.apache.org/jira/browse/MNG-6311
> Project: Maven
> Issue Type: Bug
> Components: core, Performance
> Affects Versions: 3.5.0, 3.5.2
> Reporter: David Churcher
> Priority: Major
> Labels: performance
> Attachments: Call-tree-–-All-threads-together.html,
> anon-hierarchy-maven-output.zip, modelcachefix.diff
>
>
> I have a build performance problem that is identical to MNG-5312, and has
> appeared since MNG-6030 in Maven v3.5.0 reversed the patch for MNG-5312,
> removing the ModelCache from some of the overloads for
> DefaultProjectBuilder.build.
> As in MNG-5312 the problem is in a large proprietary project. It uses up to 8
> levels of parent POMs, many of which use the import scope and have large
> dependency-management sections, and has hundreds of dependencies that also
> use the same parent POM hierarchy. Adding some logging shows that Maven does
> over 800,000 uncached reads of parent POM files, which takes about half an
> hour. With model caching this goes down to a few seconds.
> I've attached a patch that fixes this by using a class-level ModelCache in
> DefaultProjectBuilder. This does not suffer from the memory usage problems
> reported in MNG-6030.
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