Cannot increase memory for sbt console

[samthebest]

steps

Try to set memory using http://stackoverflow.com/a/15281562/1586965

export SBT_OPTS="-Xmx2G -XX:+UseConcMarkSweepGC -XX:+CMSClassUnloadingEnabled -XX:MaxPermSize=2G -Xss2M  -Duser.timezone=GMT"

Run sbt console

Runtime shows sbt does not respect my settings

scala> Runtime.getRuntime().freeMemory() / 1000 / 1000
res1: Long = 778

scala> Runtime.getRuntime().maxMemory() / 1000 / 1000
res2: Long = 1037

problem

I get 1G

expectation

I get 2G

notes

Really? 2017? :P

[dwijnand]

What operating system are you using? What sbt launcher are you using (for example how did you install it)?

[samthebest]

Mac OS 10.11.6

> sbt sbt-version
...
[info] 0.13.9

I installed sbt with brew install sbt

[dwijnand]

I can't reproduce it:

18:16:36 $ export SBT_OPTS="-Xmx2G -XX:+UseConcMarkSweepGC -XX:+CMSClassUnloadingEnabled -XX:MaxPermSize=2G -Xss2M  -Duser.timezone=GMT"

18:16:51 $ /usr/local/opt/sbt/bin/sbt -v console
[process_args] java_version = '1.8.0_112'
# Executing command line:
java
-Xmx2G
-XX:+UseConcMarkSweepGC
-XX:+CMSClassUnloadingEnabled
-XX:MaxPermSize=2G
-Xss2M
-Duser.timezone=GMT
-jar
/usr/local/Cellar/sbt/0.13.13/libexec/sbt-launch.jar
console

Java HotSpot(TM) 64-Bit Server VM warning: ignoring option MaxPermSize=2G; support was removed in 8.0
[info] Loading global plugins from /Users/dnw/.dotfiles/.sbt/0.13/plugins
[info] Loading project definition from /s/u/project
[info] Set current project to t (in build file:/s/u/)
[info] Starting scala interpreter...
[info]
Welcome to Scala 2.12.1 (Java HotSpot(TM) 64-Bit Server VM, Java 1.8.0_112).
Type in expressions for evaluation. Or try :help.

scala> Runtime.getRuntime().maxMemory() / 1000 / 1000
res0: Long = 2077

Could you check by adding -v what output you're seeing compared to mine?

[samthebest]

Interesting, when I use -v, an additional -Xmx option can be seen that comes after the -Xmx2G, I assume this overrides it - where is this option coming from??

> sbt -v console
[process_args] java_version = '1.8.0_74'
# Executing command line:
java
-Xmx2G
-XX:+UseConcMarkSweepGC
-XX:+CMSClassUnloadingEnabled
-Xss2M
-Duser.timezone=GMT
-Xms1024m
-Xmx1024m
-XX:ReservedCodeCacheSize=128m
-XX:MaxMetaspaceSize=256m
-jar
/usr/local/Cellar/sbt/0.13.9/libexec/sbt-launch.jar
console

[dwijnand]

I think you might be using a version of sbt-launcher-package that predates this fix: sbt/sbt-launcher-package#101

[samthebest]

@dwijnand

I ran brew upgrade sbt and now

# Executing command line:
java
-Xmx2G
-XX:+UseConcMarkSweepGC
-XX:+CMSClassUnloadingEnabled
-Xss2M
-Duser.timezone=GMT
-jar
/usr/local/Cellar/sbt/0.13.13/libexec/sbt-launch.jar
console

scala> Runtime.getRuntime().maxMemory() / 1000 / 1000
res0: Long = 2077

Many thanks!!

[dwijnand]

Cool! :)