====== dexopt flags ======
===== Bytecode Verification =====
  * verification v=
    * v=n VERIFY_MODE_NONE
    * v=r VERIFY_MODE_REMOTE
    * v=a VERIFY_MODE_ALL (default)
  * optimization o=
    * o=n OPTIMIZE_MODE_NONE
    * o=v OPTIMIZE_MODE_VERIFIED (default) only optimizes classes that successfully verified
    * o=a OPTIMIZE_MODE_ALL
    * o=f OPTIMIZE_MODE_FULL
  * register map m=y
  * uniprocessor target u=
    * u=y DEXOPT_UNIPROCESSOR
    * u=n DEXOPT_SMP

<code bash>
setprop dalvik.vm.dexopt-flags=m=y,o=v,u=y
setprop dalvik.vm.dexopt-flags "m=y,o=f,v=n"
setprop dalvik.vm.dexopt-flags "m=y"
setprop dalvik.vm.dexopt-flags "v=n,o=v"
</code>

====== dalvik ======
http://milk.com/kodebase/dalvik-docs-mirror/docs/embedded-vm-control.html

<code bash>
# dalvikvm --help
The following extended options are recognized:
  -Xrunjdwp:<options>
  -Xbootclasspath:bootclasspath
  -Xcheck:tag  (e.g. 'jni')
  -XmsN  (min heap, must be multiple of 1K, >= 1MB)
  -XmxN  (max heap, must be multiple of 1K, >= 2MB)
  -XssN  (stack size, >= 1KB, <= 256KB)
  -Xverify:{none,remote,all}
  -Xrs
  -Xint  (extended to accept ':portable', ':fast' and ':jit')

These are unique to Dalvik:
  -Xzygote
  -Xdexopt:{none,verified,all,full}
  -Xnoquithandler
  -Xjnigreflimit:N  (must be multiple of 100, >= 200)
  -Xjniopts:{warnonly,forcecopy}
  -Xjnitrace:substring (eg NativeClass or nativeMethod)
  -Xstacktracefile:<filename>
  -Xgc:[no]precise
  -Xgc:[no]preverify
  -Xgc:[no]postverify
  -Xgc:[no]concurrent
  -Xgc:[no]verifycardtable
  -XX:+DisableExplicitGC
  -X[no]genregmap
  -Xverifyopt:[no]checkmon
  -Xcheckdexsum
  -Xincludeselectedop
  -Xjitop:hexopvalue[-endvalue][,hexopvalue[-endvalue]]*
  -Xincludeselectedmethod
  -Xjitthreshold:decimalvalue
  -Xjitblocking
  -Xjitmethod:signature[,signature]* (eg Ljava/lang/String\;replace)
  -Xjitcheckcg
  -Xjitverbose
  -Xjitprofile
  -Xjitdisableopt
  -Xjitsuspendpoll
</code>

====== Interpreter ======
  * portable dalvik.vm.execution-mode=int:portable
  * fast dalvik.vm.execution-mode=int:fast
  * JIT dalvik.vm.execution-mode=int:jit

Not all platforms have an optimized implementation.  In such cases,
the "fast" interpreter is generated as a series of C stubs, and the
result will be slower than the
"portable" version


===== Extended JNI Checks =====
Default RO: ro.kernel.android.checkjni
can be overriden by: dalvik.vm.checkjni
<code bash>
setprop dalvik.vm.checkjni true
</code>
To pass dalvik.vm.jniopts option as -Xjniopts argument.
<code bash>
setprop dalvik.vm.jniopts forcecopy
</code>


===== Stack size =====
<code>setprop dalvik.vm.extra-opts "-Xss16K"</code>

dalvik.vm.verify-bytecode false


<code ini>
# DISABLE ERROR CHECKING
ro.kernel.android.checkjni=0

dalvik.vm.checkjni=false
dalvik.vm.dexopt-data-only=1
dalvik.vm.heapsize=64m
dalvik.vm.verify-bytecode=false
dalvik.vm.lockprof.threshold=250
dalvik.vm.dexopt-flags=m=v,o=y
-Xverify:none -Xdexopt:verified

dalvik.vm.stack-trace-file=/data/anr/traces.txt
dalvik.vm.jmiopts=forcecopy

</code>

# MAKES APPS LOAD FASTER AND FREES MORE RAM / use only one of them
dalvik.vm.dexopt-flags=v=a,o=v,m=y,u=y
dalvik.vm.dexopt-flags m=y,o=v,u=y
dalvik.vm.dexopt-flags=m=y