Dex2oat in ART Android

We use to optimize apk by using dexopt in dalvik

and i used this command in custom roms

dexopt /system/app/app.apk /system/app/app.odex

optimize the apk file

but as you know dexopt do not work in ART we have to use new dex2oat provided by Google

i tried

dex2oat /system/app/app.apk /system/app/aap.odex

but it does not work

any working command i can try in terminal emulator to optimize apk in ART