Check Java default heap size

• $ java -XX:+PrintFlagsFinal -version | grep HeapSize

  The output should be look like below:

      uintx ErgoHeapSizeLimit                         = 0                                   {product}
      uintx HeapSizePerGCThread                       = 87241520                            {product}
      uintx InitialHeapSize                          := 268435456                           {product}
      uintx LargePageHeapSizeThreshold                = 134217728                           {product}
      uintx MaxHeapSize                              := 4294967296                          {product}
  java version "1.8.0_171"
  Java(TM) SE Runtime Environment (build 1.8.0_171-b11)
  Java HotSpot(TM) 64-Bit Server VM (build 25.171-b11, mixed mode)
  

see also

• How is the default Java heap size determined?