增加 Scala 的 JVM 堆大小？
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Increase JVM heap size for Scala?
提问by Jay Conrod
I have a Scala data processing tool which is failing with a java.lang.OutOfMemoryErrorexception. The tool needs to make a couple passes over a large data file (the one I'm working on is over 700MB), so it would be convenient if the entire thing could be stored in memory.
我有一个 Scala 数据处理工具，它因java.lang.OutOfMemoryError异常而失败。该工具需要对大型数据文件进行几次传递（我正在处理的文件超过 700MB），因此如果可以将整个文件存储在内存中会很方便。
I run the tool from the command line or from a Bash script using the "scala" runner. How do I increase the JVM heap size for this? I've tried passing -Xmx1024m, but it does not recognize this argument. I'm using a nightly build of Scala 2.8.0 (r18678).
我使用“scala”运行程序从命令行或 Bash 脚本运行该工具。如何为此增加 JVM 堆大小？我试过通过-Xmx1024m，但它不承认这个论点。我正在使用 Scala 2.8.0 (r18678) 的夜间版本。
采纳答案by Synesso
The JAVA_OPTS environment variable is used to specify the options passed to the java command. See the Scala manpagefor details.
JAVA_OPTS 环境变量用于指定传递给 java 命令的选项。有关详细信息，请参阅Scala 联机帮助页。
回答by Geoffrey Irving
You can pass options to the JVM via -J. E.g.,
您可以通过 -JEg 将选项传递给 JVM，
scala -J-Xmx2g ...
回答by Jay Conrod
Based on Joe's suggestion, I looked at the scala program, which is a Bash script that calls java with various Scala specific arguments. It allows extra command line arguments to be passed to Java through the JAVA_OPTS environment variable. So you can increase the heap size like this:
根据 Joe 的建议，我查看了 scala 程序，这是一个 Bash 脚本，它使用各种 Scala 特定参数调用 java。它允许通过 JAVA_OPTS 环境变量将额外的命令行参数传递给 Java。所以你可以像这样增加堆大小：
JAVA_OPTS="-Xmx2g" scala classname arguments...
回答by Daniel C. Sobral
Edit JAVA_OPTS.
编辑JAVA_OPTS。
回答by Joe
As a hack you can edit the scala/bin/scalafile to edit the parameters for the javacommand. Not pretty.
作为黑客，您可以编辑scala/bin/scala文件以编辑java命令的参数。不漂亮。
