On 2018-04-13T21:48:58 +0200 Karl Heinz Marbaise <khmarba...@gmx.de> wrote:
> Hi Mark, 'Ello. > On 13/04/18 21:20, Mark Raynsford wrote: > > First it would be good to know which Maven version are you using? And on > which JDK you are running? Hah, I purposefully left out details in the hope that it wouldn't be my problem specifically. From the one second build you've described, it appears that perhaps it might be. My system: Linux copperhead.int.arc7.info 4.15.14-1-ARCH #1 SMP PREEMPT Wed Mar 28 17:34:29 UTC 2018 x86_64 GNU/Linux Intel(R) Core(TM) i5-2410M CPU @ 2.30GHz, 8GB ram. openjdk version "9.0.4" OpenJDK Runtime Environment (build 9.0.4+11) OpenJDK 64-Bit Server VM (build 9.0.4+11, mixed mode) Apache Maven 3.5.2 (NON-CANONICAL_2017-10-25T13:09:52+03:00_root; 2017-10-25T10:09:52Z) Maven home: /opt/maven Java version: 9.0.4, vendor: Oracle Corporation Java home: /usr/lib/jvm/java-9-openjdk Default locale: en_GB, platform encoding: UTF-8 OS name: "linux", version: "4.15.14-1-arch", arch: "amd64", family: "unix" > Maybe I misunderstand you ...are you running it from plain command line > or from inside your IDE ? The command line in the log is: mvn -Dmaven.tests.skip=true -DskipTests=true package Although in the IDE in real projects, I'm skipping more plugin executions than that. > > What are you memory settings? How is your JDK configured ? Which command > line options ? (MAVEN_OPTS?):?? I'm both running it from the command line and from the IDE. My point was that 16 seconds for a command line build is tolerable (although still pretty damn high for a project that only compiles one Java file and doesn't do anything else), but running the same build from within an IDE is painful (because in the IDE, I'm hoping for instant gratification when I click "Run..." and I don't care about producing a full build that someone else will use). $ env | grep MAVEN MAVEN_OPTS=-Xmx512m My JDK is essentially unconfigured. Whatever the default settings are for Linux AMD64, OpenJDK 9. > Depending on your JVM and the configuration that can be quite large > different time on startup...there are several configurations which can > be used to improve that... I'm open to suggestions. I'm fairly confident that it's not JVM startup time that's the issue. For example, if I add the -X flag to Maven, you can see that control reaches whatever passes for Maven's main() function in roughly one second: 2018-04-13 21:00:01.455570500 2018-04-13 21:00:02.740905500 Apache Maven 3.5.2 (NON-CANONICAL_2017-10-25T13:09:52+03:00_root; 2017-10-25T10:09:52Z) 2018-04-13 21:00:02.741034500 Maven home: /opt/maven 2018-04-13 21:00:02.741192500 Java version: 9.0.4, vendor: Oracle Corporation 2018-04-13 21:00:02.741333500 Java home: /usr/lib/jvm/java-9-openjdk 2018-04-13 21:00:02.741454500 Default locale: en_GB, platform encoding: UTF-8 2018-04-13 21:00:02.741829500 OS name: "linux", version: "4.15.14-1-arch", arch: "amd64", family: "unix" 2018-04-13 21:00:06.841656500 [DEBUG] Created new class realm maven.api 2018-04-13 21:00:06.842724500 [DEBUG] Importing foreign packages into class realm maven.api 2018-04-13 21:00:06.844680500 [DEBUG] Imported: javax.annotation.* < plexus.core 2018-04-13 21:00:06.847413500 [DEBUG] Imported: javax.enterprise.inject.* < plexus.core 2018-04-13 21:00:06.847911500 [DEBUG] Imported: javax.enterprise.util.* < plexus.core 2018-04-13 21:00:06.848473500 [DEBUG] Imported: javax.inject.* < plexus.core 2018-04-13 21:00:06.849076500 [DEBUG] Imported: org.apache.maven.* < plexus.core 2018-04-13 21:00:06.849575500 [DEBUG] Imported: org.apache.maven.artifact < plexus.core 2018-04-13 21:00:06.850103500 [DEBUG] Imported: org.apache.maven.classrealm < plexus.core 2018-04-13 21:00:06.850619500 [DEBUG] Imported: org.apache.maven.cli < plexus.core 2018-04-13 21:00:06.851178500 [DEBUG] Imported: org.apache.maven.configuration < plexus.core 2018-04-13 21:00:06.851678500 [DEBUG] Imported: org.apache.maven.exception < plexus.core 2018-04-13 21:00:06.852183500 [DEBUG] Imported: org.apache.maven.execution < plexus.core 2018-04-13 21:00:06.852685500 [DEBUG] Imported: org.apache.maven.execution.scope < plexus.core 2018-04-13 21:00:06.853183500 [DEBUG] Imported: org.apache.maven.lifecycle < plexus.core 2018-04-13 21:00:06.853653500 [DEBUG] Imported: org.apache.maven.model < plexus.core 2018-04-13 21:00:06.854292500 [DEBUG] Imported: org.apache.maven.monitor < plexus.core 2018-04-13 21:00:06.854777500 [DEBUG] Imported: org.apache.maven.plugin < plexus.core 2018-04-13 21:00:06.855287500 [DEBUG] Imported: org.apache.maven.profiles < plexus.core 2018-04-13 21:00:06.855786500 [DEBUG] Imported: org.apache.maven.project < plexus.core 2018-04-13 21:00:06.856284500 [DEBUG] Imported: org.apache.maven.reporting < plexus.core 2018-04-13 21:00:06.856757500 [DEBUG] Imported: org.apache.maven.repository < plexus.core 2018-04-13 21:00:06.857291500 [DEBUG] Imported: org.apache.maven.rtinfo < plexus.core 2018-04-13 21:00:06.857751500 [DEBUG] Imported: org.apache.maven.settings < plexus.core 2018-04-13 21:00:06.858242500 [DEBUG] Imported: org.apache.maven.toolchain < plexus.core 2018-04-13 21:00:06.858750500 [DEBUG] Imported: org.apache.maven.usability < plexus.core 2018-04-13 21:00:06.859247500 [DEBUG] Imported: org.apache.maven.wagon.* < plexus.core 2018-04-13 21:00:06.859817500 [DEBUG] Imported: org.apache.maven.wagon.authentication < plexus.core 2018-04-13 21:00:06.860359500 [DEBUG] Imported: org.apache.maven.wagon.authorization < plexus.core 2018-04-13 21:00:06.860882500 [DEBUG] Imported: org.apache.maven.wagon.events < plexus.core 2018-04-13 21:00:06.861413500 [DEBUG] Imported: org.apache.maven.wagon.observers < plexus.core 2018-04-13 21:00:06.861943500 [DEBUG] Imported: org.apache.maven.wagon.proxy < plexus.core 2018-04-13 21:00:06.862494500 [DEBUG] Imported: org.apache.maven.wagon.repository < plexus.core 2018-04-13 21:00:06.862991500 [DEBUG] Imported: org.apache.maven.wagon.resource < plexus.core 2018-04-13 21:00:06.863587500 [DEBUG] Imported: org.codehaus.classworlds < plexus.core 2018-04-13 21:00:06.864084500 [DEBUG] Imported: org.codehaus.plexus.* < plexus.core 2018-04-13 21:00:06.864589500 [DEBUG] Imported: org.codehaus.plexus.classworlds < plexus.core 2018-04-13 21:00:06.865246500 [DEBUG] Imported: org.codehaus.plexus.component < plexus.core 2018-04-13 21:00:06.865785500 [DEBUG] Imported: org.codehaus.plexus.configuration < plexus.core 2018-04-13 21:00:06.866347500 [DEBUG] Imported: org.codehaus.plexus.container < plexus.core 2018-04-13 21:00:06.866863500 [DEBUG] Imported: org.codehaus.plexus.context < plexus.core 2018-04-13 21:00:06.867389500 [DEBUG] Imported: org.codehaus.plexus.lifecycle < plexus.core 2018-04-13 21:00:06.867877500 [DEBUG] Imported: org.codehaus.plexus.logging < plexus.core 2018-04-13 21:00:06.868428500 [DEBUG] Imported: org.codehaus.plexus.personality < plexus.core 2018-04-13 21:00:06.868969500 [DEBUG] Imported: org.codehaus.plexus.util.xml.Xpp3Dom < plexus.core 2018-04-13 21:00:06.869528500 [DEBUG] Imported: org.codehaus.plexus.util.xml.pull.XmlPullParser < plexus.core 2018-04-13 21:00:06.870156500 [DEBUG] Imported: org.codehaus.plexus.util.xml.pull.XmlPullParserException < plexus.core 2018-04-13 21:00:06.870915500 [DEBUG] Imported: org.codehaus.plexus.util.xml.pull.XmlSerializer < plexus.core 2018-04-13 21:00:06.871710500 [DEBUG] Imported: org.eclipse.aether.* < plexus.core 2018-04-13 21:00:06.872369500 [DEBUG] Imported: org.eclipse.aether.artifact < plexus.core 2018-04-13 21:00:06.872882500 [DEBUG] Imported: org.eclipse.aether.collection < plexus.core 2018-04-13 21:00:06.873802500 [DEBUG] Imported: org.eclipse.aether.deployment < plexus.core 2018-04-13 21:00:06.874304500 [DEBUG] Imported: org.eclipse.aether.graph < plexus.core 2018-04-13 21:00:06.874690500 [DEBUG] Imported: org.eclipse.aether.impl < plexus.core 2018-04-13 21:00:06.875170500 [DEBUG] Imported: org.eclipse.aether.installation < plexus.core 2018-04-13 21:00:06.875679500 [DEBUG] Imported: org.eclipse.aether.internal.impl < plexus.core 2018-04-13 21:00:06.876191500 [DEBUG] Imported: org.eclipse.aether.metadata < plexus.core 2018-04-13 21:00:06.876668500 [DEBUG] Imported: org.eclipse.aether.repository < plexus.core 2018-04-13 21:00:06.877151500 [DEBUG] Imported: org.eclipse.aether.resolution < plexus.core 2018-04-13 21:00:06.877530500 [DEBUG] Imported: org.eclipse.aether.spi < plexus.core 2018-04-13 21:00:06.877950500 [DEBUG] Imported: org.eclipse.aether.transfer < plexus.core 2018-04-13 21:00:06.878354500 [DEBUG] Imported: org.eclipse.aether.version < plexus.core 2018-04-13 21:00:06.878870500 [DEBUG] Imported: org.fusesource.jansi.* < plexus.core 2018-04-13 21:00:06.879322500 [DEBUG] Imported: org.slf4j.* < plexus.core 2018-04-13 21:00:06.879766500 [DEBUG] Imported: org.slf4j.helpers.* < plexus.core 2018-04-13 21:00:06.880195500 [DEBUG] Imported: org.slf4j.spi.* < plexus.core 2018-04-13 21:00:06.880859500 [DEBUG] Populating class realm maven.api 2018-04-13 21:00:07.210344500 [INFO] Error stacktraces are turned on. 2018-04-13 21:00:07.210806500 [DEBUG] Message scheme: color 2018-04-13 21:00:07.214240500 [DEBUG] Message styles: debug info warning error success failure strong mojo project 2018-04-13 21:00:07.236587500 [DEBUG] Reading global settings from /opt/maven/conf/settings.xml 2018-04-13 21:00:07.237263500 [DEBUG] Reading user settings from /home/someone/.m2/settings.xml 2018-04-13 21:00:07.343776500 [DEBUG] Reading global toolchains from /opt/maven/conf/toolchains.xml 2018-04-13 21:00:07.344127500 [DEBUG] Reading user toolchains from /home/someone/.m2/toolchains.xml 2018-04-13 21:00:07.381532500 [DEBUG] Using local repository at /home/someone/.m2/repository 2018-04-13 21:00:07.482942500 [DEBUG] Using manager EnhancedLocalRepositoryManager with priority 10.0 for /home/someone/.m2/repository 2018-04-13 21:00:07.528131500 [INFO] Scanning for projects... You can see that it takes roughly a second to get as far as printing the "Apache Maven 3.5.2..." message, and then takes about four seconds to get to "Created new class realm...". It's up to seven seconds before it even starts scanning for projects. The build then takes a good 5-7 seconds on top of that. That equates to about twelve seconds minimum when I click "Run..." in an IDE, for a single-module build with next to no plugins executing. Are there options that can improve Maven's startup time? The maven-buildtime-profiler plugin will definitely be useful for larger builds, but right now I'm concerned about this bit of overhead that appears to be present for even the most trivial of builds. I'm not sure the profiler will even see that overhead as it happens before the profiler would have a chance to capture data. -- Mark Raynsford | http://www.io7m.com
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