JVM Arguments

Compilation

-XX:+PrintCompilation

• -XX means it’s an advanced option
• a plus or a minus indicates if we want the option to be switched on or off
• and then the option name in SentenceCase

-XX:+UnlockDiagnosticVMOptions -XX:+LogCompilation

• creates a log file like hotspot_pid1234.log

-XX:-TieredCompilation : Turn off the Tiered Compilation

java -XX:+PrintFlagsFinal

Check the following flags

• CICompilerCount - how many threads are available to run the compiling process
• CompileThreshold - the number of times a method/code needs to run before it is natively compiled

  bool C1ProfileVirtualCalls                    = true                                   {C2 product} {default}
  bool C1UpdateMethodData                       = true                                   {C2 product} {default}
  intx CICompilerCount                          = 12                                        {product} {ergonomic}
  bool CICompilerCountPerCPU                    = true                                      {product} {default}
  intx CompileThreshold                         = 10000                                  {pd product} {default}