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https://issues.apache.org/jira/browse/MNG-7677?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17683742#comment-17683742
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Michael Osipov commented on MNG-7677:
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Thank your very much Petr for the didication!
> Maven 3.9.0 is ~10% slower than 3.8.7 in large multi-module builds
> ------------------------------------------------------------------
>
> Key: MNG-7677
> URL: https://issues.apache.org/jira/browse/MNG-7677
> Project: Maven
> Issue Type: Bug
> Components: Performance
> Affects Versions: 3.9.0
> Reporter: Petr Široký
> Priority: Minor
>
> When testing the upcoming [Maven release
> 3.9.0|https://repository.apache.org/content/repositories/maven-1862/org/apache/maven/apache-maven/3.9.0/apache-maven-3.9.0-bin.tar.gz]
> I noticed the builds for large multi-module projects are somewhat slower.
> I was mainly using the [Quarkus
> projects|https://github.com/quarkusio/quarkus], which has more than 1k
> modules. I was specifically bulding the {{2.16.1.Final}} tag. Below are the
> numbers I got.
> *First batch:*
> {code:java}
> MAVEN_OPTS="-XX:+UseParallelGC -Xms2g -Xmx2g"{code}
> ||Maven cmd||Build time - Maven 3.8.7||Build time - Maven 3.9.0||
> |clean|2.9s|3.2s|
> |validate|02:17min|02:34min|
> |validate -T8|29s|33s|
> |validate -Dversion.enforcer.plugin=3.2.1|29s|40s|
> |validate -Dversion.enforcer.plugin=3.2.1 -T8|9s|14s|
> *Second batch (bigger heap):*
> {code:java}
> MAVEN_OPTS="-XX:+UseParallelGC -Xms5g -Xmx5g"{code}
> ||Maven cmd||Build time - Maven 3.8.7||Build time - Maven 3.9.0||
> |clean|2.9s|3.2s|
> |validate|02:11min|02:22min|
> |validate -T8|25s|28s|
> |validate -Dversion.enforcer.plugin=3.2.1|29s|35s|
> |validate -Dversion.enforcer.plugin=3.2.1 -T8|9s|11s|
> |install -DskipTests -Dversion.enforcer.plugin=3.2.1 -T8|01:49min|01:55min|
> *Notes:*
> * The numbers are taken from the Maven output (the Wall Clock time). When
> testing with the time utility, the "real" execution time is about 0.6s longer
> (the time JVM needs to start-up). The values in the tables are averages over
> several runs (3 to 10 depending on the time the specific run actually took).
> * All builds were run on Linux x64 (kernel 6.1.8) with JDK 19.0.1
> * HW used during testing: AMD Ryzen 5800x (8 physical cores), 32GB RAM and
> SSD Samsung 980 Pro 1TB (these should not really matter for the comparison
> itself, but I am including it for completeness)
> * Using {{ParallelGC}} since it should be the one with highest throughput
> (at the cost of longer pause times, which I don't really care about for Maven
> builds). Quick comparison with {{G1GC}} shows the builds are slightly faster,
> but it is almost negligible.
> There has already been some discussion regarding this in this older merged PR
> [https://github.com/apache/maven-resolver/pull/166] (which may be the cause
> behind the slowdown).
> TODO: I would like to provide some more data I got from the analysis with
> async-profiler / JFR.
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