Scaladoc で OutOfMemory が出た時の対処 ref: http://qiita.com/potato2003@github/items/f7bed8ef8197fdf2f4c0

gistfile1.txt

$ scaladoc -d doc/ -s src/main/scala/**/*.scala

gistfile2.txt

uncaught exception during compilation: java.lang.OutOfMemoryError
three errors found
Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
    at scala.reflect.internal.util.HashSet.growTable(HashSet.scala:97)
    at scala.reflect.internal.util.HashSet.findEntryOrUpdate(HashSet.scala:39)
    at scala.reflect.internal.Types$class.unique(Types.scala:3940)

...

gistfile3.txt

$ export JAVA_OPTS="-Xms256m -Xmx1024m"
$ scaladoc -d doc/ -s src/main/scala/**/*.scala

gistfile4.sh

[[ -n "$JAVA_OPTS" ]] || JAVA_OPTS="-Xmx256M -Xms32M"

...

execCommand \
  "${JAVACMD:=java}" \
  $JAVA_OPTS \
  "${java_args[@]}" \
  $(classpathArgs) \
  -Dscala.home="$SCALA_HOME" \
  -Dscala.usejavacp=true \
  $EMACS_OPT \
  $WINDOWS_OPT \
   scala.tools.nsc.ScalaDoc  "$@"