This is interesting discussion and so I decided to build your project with Java 9 and Maven 3.5.3. Completed within 1.5 sec. I have noticed that Maven 3.3.9 was slower, cca 2.5 sec.
mvn -V test Apache Maven 3.5.3 (3383c37e1f9e9b3bc3df5050c29c8aff9f295297; 2018-02-24T20:49:05+01:00) Maven home: D:\apache-maven-3.5.3 Java version: 9.0.1, vendor: Oracle Corporation Java home: e:\Program Files\Java\jdk-9.0.1 Default locale: en_US, platform encoding: Cp1250 OS name: "windows 7", version: "6.1", arch: "amd64", family: "windows" [INFO] Scanning for projects... [INFO] [INFO] -----------------< com.io7m.minimal:com.io7m.minimal >------------------ [INFO] Building com.io7m.minimal 0.0.1 [INFO] --------------------------------[ jar ]--------------------------------- [INFO] [INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ com.io7m.minimal --- [WARNING] Using platform encoding (Cp1250 actually) to copy filtered resources, i.e. build is platform dependent! [INFO] skip non existing resourceDirectory d:\vcs\github\maven-minimal-20180413\src\main\resources [INFO] [INFO] --- maven-compiler-plugin:3.7.0:compile (default-compile) @ com.io7m.minimal --- [INFO] Nothing to compile - all classes are up to date [INFO] [INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ com.io7m.minimal --- [WARNING] Using platform encoding (Cp1250 actually) to copy filtered resources, i.e. build is platform dependent! [INFO] skip non existing resourceDirectory d:\vcs\github\maven-minimal-20180413\src\test\resources [INFO] [INFO] --- maven-compiler-plugin:3.7.0:testCompile (default-testCompile) @ com.io7m.minimal --- [INFO] No sources to compile [INFO] [INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ com.io7m.minimal --- [INFO] No tests to run. [INFO] ------------------------------------------------------------------------ [INFO] BUILD SUCCESS [INFO] ------------------------------------------------------------------------ [INFO] Total time: 1.450 s [INFO] Finished at: 2018-04-14T11:36:37+02:00 [INFO] ------------------------------------------------------------------------ On Fri, Apr 13, 2018 at 9:20 PM, Mark Raynsford < org.apache.maven.u...@io7m.com> wrote: > Hello. > > Is there any way I might speed up Maven? I've been using it for years > and, for the first time, I'm actually executing it from an IDE rather > than using the IDE's built-in compiler. It seems like there's a rather > large and apparently fixed amount of overhead per invocation. Take the > following "could not be simpler" project: > > https://github.com/io7m/maven-minimal-20180413 > > I piped the output through tai64n [1] to give a better indication of > exactly how long everything is taking. That's a project that compiles a > single Java file and produces a jar. It doesn't run any tests, it > doesn't include any resources. 16 seconds total execution [2]! > > Now for an infrequent command-line build, that's not *too* obnoxious. > For a "click a button in the IDE because I want to try this bit of code > now" build, that's a world of suffering. > > It seems like Maven first spends ten entire seconds doing not very > much. That cannot be attributed to JVM startup time (Hello World on my > system takes about 100ms to reach user code, and even the largest Java > application I still takes less than a second to reach user code after > all the classes have loaded). > > Is there anything I can do to cut this down? If not, is this something > that's intended to be addressed in the near future? > > [1] http://cr.yp.to/daemontools/tai64n.html > [2] The Maven output claims 6 seconds, but that doesn't include the > time it took for the build to start. > > -- > Mark Raynsford | http://www.io7m.com > >
