OutOfMemoryError: Java heap space when running jruby on rails console but not using all the memory defined by -J-Xmx

jruby项目运行时报错：
OutOfMemoryError: Java heap space when running jruby on rails console but not using all the memory defined by -J-Xmx
解决办法：
启动时增加JVM配置参数
RAILS_ENV=samuel_hml jruby -J-Xms1024m -J-Xmx4096m -J-XX:+UseConcMarkSweepGC -J-XX:+CMSIncrementalMode -S rails s