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I am running 

sbt compile

for a compiling a program. I am getting the 

OutOfMemoryError: Java heap space

Exception. Instead I tried 

sbt compile -J-Xms4G -J-Xmx6G

But I don't see any difference in memory usage of the program, like ignoring the command-line options, and I get the same exception (and when crashing it is barely using 0.8GB).

Daniel
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    See this answer about setting `SBT_OPTS` - http://stackoverflow.com/a/14561346/390708 – Brian May 28 '15 at 04:13
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    To check settings in effect use `jconsole` or similar tool. It has `VM Summary` page that displays stuff like this: `VM arguments:  -Xmx256M -Xms32M -D...` – yǝsʞǝla May 28 '15 at 06:18

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