How Do I Change Memory Settings For Jack?

I am trying to compile Cyanogenmod 13 (for Galaxy Nexus) but the new Jack server won't start.

I get as far as this then it hangs and eventually fails.

Code:

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Launching background server java -Dfile.encoding=UTF-8 -Xms2560m -XX:+TieredCompilation -jar /home/buildbot/android/system/out/host/linux-x86/framework/jack-launcher.jar -cp /home/buildbot/android/system/out/host/linux-x86/framework/jack.jar com.android.jack.server.JackSimpleServer

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The failure message is

Code:

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/home/buildbot/android/system/out/host/linux-x86/bin/jack: line 131:  9050 Killed                  $SERVER_PRG $SERVER_PORT_SERVICE $SERVER_PORT_ADMIN $SERVER_COUNT $SERVER_NB_COMPILE $SERVER_TIMEOUT >> $SERVER_LOG 2>&1
ERROR: Cannot launch Jack server
make: *** [/home/buildbot/android/system/out/target/common/obj/JAVA_LIBRARIES/core-libart_intermediates/with-local/classes.dex] Error 41
make: Leaving directory `/home/buildbot/android/system'

#### make failed to build some targets (11:27 (mm:ss)) ####

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The ~/.jack file has 777

Code:

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buildbot@buildenv ~/android/system$ ls -l ~/.jack
-rwxrwxrwx 1 buildbot buildbot 283 Sep 22 03:19 /home/buildbot/.jack

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2.5GB seems quite a large minimum heap and I only have 3GB assigned to this VM.

Before running brunch I did

Code:

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export DEFAULT_JACK_VM_ARGS="-Dfile.encoding=UTF-8 -Xms1024m -XX:+TieredCompilation "

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but as you can see from above that had no effect.

How do I change the memory settings (Xms and Xmx)?

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