This option will show if the some portion of the code is used by C1 or C2 compiler to create Native code block for Faster execution. Level 1,2,3 is C1. Level 4 is C2. C2 is better. JVM decidees it. These are JIT compiler. Not like compile java code. While running JVM decides if a particular method is being invoked many times then it will again compile it using JIT for better performance.

This will log the compilation output to a file.

Check for Code cache size.

Set the Code Cache Size 28m => 28Mega Byte