Code Index 5 released

Update

• Add test to compare JNI array access method.
• Reduce case in byte array copy/fill.
• Test time per case increased to 2 sec.

JniGetReleaseByteArray @ Samsung Galaxy Note 2

Observations

• Access time does not affected by array size.
• Access time does not affected by JNIABORT flag.
• Get/ReleasePrimitiveArrayCritical is slower than Get/ReleaseByteArrayElements.
• In short array, using stupid Java for-loop is better.

Facts

• Android src: dalvik/vm/Jni.cpp, Line 2351, 2594.
• Implementation does not care JNIABORT.
• Array size may affect the cost in native pinPrimitiveArray call. But I am not sure.
• isCopy arg just output false.
• Implementation of Get/ReleasePrimitiveArrayCritical and Get/ReleaseByteArrayElements are the same. However the Get/ReleasePrimitiveArrayCritical output void*. May be that is why Get/ReleasePrimitiveArrayCritical is slower.