Maven:在pom.xml中配置并行构建 [英] Maven: configure parallel build in pom.xml

问题描述

Maven可以执行并行构建: https://cwiki.apache.org/confluence/display /MAVEN/Parallel + builds + in + Maven + 3

Maven has a capability to perform parallel builds: https://cwiki.apache.org/confluence/display/MAVEN/Parallel+builds+in+Maven+3

mvn -T 4 clean install # Builds with 4 threads
mvn -T 1C clean install # 1 thread per cpu core
mvn -T 1.5C clean install # 1.5 thread per cpu core

是否可以在pom.xml或settings.xml中指定此参数?重复此选项可能很烦人.

Is it possible to specify this arguments in pom.xml or settings.xml? Repeating this options could be annoying.

推荐答案

此解决方案有些破绽，但对我有用.它涉及指定一个新的环境变量，为其分配值-T3并将此变量添加到Maven启动脚本中.

This solution is a bit of a hack but worked for me. It involves specifying a new environment variable, assigning the value -T3 to it and adding this variable to the Maven launch script.

对于Windows(在Linux中为parens):

For Windows (Linux in parens):

1. 打开环境变量"窗口:计算机->属性->高级系统设置->环境变量
2. 添加具有所需值的属性 MAVEN_CMD_LINE_OPTS .就我而言，-T 3是我希望Maven使用3个线程并行构建.

3. 编辑 mvn.cmd 文件(在Linux中: mvn 文件).找到实际执行Java命令的部分，以％MAVEN_JAVA_EXE％开头的行(在Linux中:通常在定义主类的行之后: org.codehaus.plexus.classworlds.launcher .Launcher )

1. Open the Environment Variables window: Computer -> Properties -> Advanced System settings -> Environment Variables
2. Add the property MAVEN_CMD_LINE_OPTS with your desired value. In my case -T 3 as I want Maven to use 3 threads to build in parallel.

3. Edit the mvn.cmd file (In Linux: the mvn file). Find the part where the Java command is actually executed, the line starting with %MAVEN_JAVA_EXE% (In Linux: generally after the line defining the main class: org.codehaus.plexus.classworlds.launcher.Launcher)

在行尾添加％MAVEN_CMD_LINE_OPTS％(在Linux中:$ MAVEN_CMD_LINE_OPTS)

Add %MAVEN_CMD_LINE_OPTS% to the end of the line (In Linux: $MAVEN_CMD_LINE_OPTS)

在Maven项目上运行 mvn编译时，您现在将看到以下行:

When you run mvn compile on a Maven project you will now see the following line:

使用线程数为3的MultiThreadedBuilder实现

这具有用户能够覆盖"该值的优点.因此，如果用户执行 mvn -T4编译，则将使用4个线程，而不是默认的3个线程.

This has the advantage of the user being able to 'override' this value. So if the user executes mvn -T4 compile, then 4 threads are used instead of the default 3.

注意:

1. 我在Maven 3.3.9上尝试过此方法，但该概念应在任何Maven上均可 版本.
2. 多线程构建可能会遇到插件问题 特别是自定义插件不是线程安全的.因此，请谨慎使用 考虑将其禁用以解决问题.

1. I tried this on Maven 3.3.9 but the concept should work on any Maven version.
2. Multi-threaded builds can suffer from issues where plugins especially custom plugins are not thread safe. So use with care and consider disabling this as a fix in case of issues.

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