Help processing G1GC logs (visualization tools) - also, mysterious great performance after inexplicable full GC?

[Bernd Eckenfels]

Am 18.10.2012, 05:36 Uhr, schrieb Aaron Daubman <daubman at gmail.com>:
> What would be a good way for me to find this out? (e.g. is there an
> up-to-date list of flags and defaults for current JDK versions?)

You can add "-XX:+PrintCommandLineFlags", this way the VM will print in  
the first line after start the command line flags you have specified as  
well as the ones which have been enabled/disabled automatically.

For the defaults (= sign) and specified (:= sign) values of the vm  
options, you can use something like this:

C:\Users\eckenfel>java -XX:+UseG1GC -XX:+PrintFlagsFinal -version | find  
"Stack"
     uintx CMSRevisitStackSize                       = 1048576          
{product}
      intx CompilerThreadStackSize                   = 0               {pd  
product}
      intx G1MarkRegionStackSize                     = 1048576          
{product}
     uintx GCDrainStackTargetSize                    = 64               
{product}
      bool JavaMonitorsInStackTrace                  = true             
{product}
     uintx MarkStackSize                             = 16777216         
{product}
     uintx MarkStackSizeMax                          = 536870912        
{product}
      intx MaxJavaStackTraceDepth                    = 1024             
{product}
      bool OmitStackTraceInFastThrow                 = true             
{product}
      intx OnStackReplacePercentage                  = 140             {pd  
product}
     uintx PreserveMarkStackSize                     = 1024             
{product}
      intx StackRedPages                             = 1               {pd  
product}
      intx StackShadowPages                          = 6               {pd  
product}
      bool StackTraceInThrowable                     = true             
{product}
      intx StackYellowPages                          = 2               {pd  
product}
      intx ThreadStackSize                           = 0               {pd  
product}
      bool UseOnStackReplacement                     = true            {pd  
product}
      intx VMThreadStackSize                         = 0               {pd  
product}
java version "1.7.0_07"
Java(TM) SE Runtime Environment (build 1.7.0_07-b10)
Java HotSpot(TM) 64-Bit Server VM (build 23.3-b01, mixed mode)

Bernd