Sencha Cmd インストールしたけどメモリ不足？

http://www.sencha.com/products/sencha-cmd/download

c:\touch-2.3.1>sencha
Error occurred during initialization of VM
Could not reserve enough space for object heap
Error: Could not create the Java Virtual Machine.
Error: A fatal exception has occurred. Program will exit.

512mにおとすといいという記述発見 http://www.sencha.com/forum/showthread.php?251529-Java-Heap-Size

C:\Users\hoge\bin\Sencha\Cmd\4.0.2.67\sencha.cfgを編集

cmd.jvm.args=-Xms128m -Xmx1024m -Djava.awt.headless=true
↓
cmd.jvm.args=-Xms128m -Xmx512m -Djava.awt.headless=true

起動できた。