如何设置 sbt 的堆大小? [英] How to set heap size for sbt?

问题描述

我使用的是 SBT 0.12.0.我已经阅读了有关堆栈溢出的其他答案并遵循了它们，但是它们都没有帮助，例如:

I am using SBT 0.12.0. I have read other answers on stack overflow and followed them, however none of them helps, for example:

• 创建 ForkRun 类 - 我在使用 sbt 期间没有观察到任何分叉过程
• 设置环境变量 JAVA_OPTS - 它已设置，但 sbt 的进程命令行似乎根本不使用它.
• sbt -J-Xmx2G 将参数附加到 sbt 进程命令行，但是 sbt 使用旧值 -Xmx1536m 而不是附加参数.

• create ForkRun class - I have not observed any forked process during my usage of sbt
• set environment variable JAVA_OPTS - it is set but sbt's process command line does not seem to use it at all.
• sbt -J-Xmx2G appends the parameter to sbt process command line, however the old value -Xmx1536m is used by sbt instead of the appended parameter.

我错过了什么吗?在进行测试和 run 时，如何为 sbt 0.12 设置堆大小?

Am I missing something? How do I set heap size for sbt 0.12, when doing both testing and run?

推荐答案

我找到了解决方案.无论您如何指定 JVM 堆大小，它都不会起作用，因为 SBT 可执行文件已经覆盖了它.

I have found the solution. No matter how you specify JVM heap size, it will never work because SBT executable already has it overridden.

SBT 可执行文件中有一行表示:

There is a line in SBT executable which says:

<代码>./usr/share/sbt/sbt-launch-lib.bash

所以我编辑了文件:

  # run sbt
  execRunner "$java_cmd" \
    ${SBT_OPTS:-$default_sbt_opts} \
-   $(get_mem_opts $sbt_mem) \
    ${java_opts} \
    ${java_args[@]} \
    -jar "$sbt_jar" \
    "${sbt_commands[@]}" \
    "${residual_args[@]}"

删除 - 行.

现在，当您运行 SBT 时，它将不再覆盖您的 JVM 堆大小设置.您可以使用@Noan 的回答来指定堆大小设置.

Now when you run SBT, it will no longer override your JVM heap size settings. You can specify heap size settings using @Noan's answer.

或者:

sbt -J-Xmx4G -J-Xms4G

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