Site icon Narayana Tutorial

How to check Java Heap Memory in windows system

Find Minimum Heap Memory

Table of Contents

Open windows command prompt and then enter the following command.

javaw -XX:+PrintFlagsFinal | find “InitialHeapSize”

Ouput


C:\Users\swamy>javaw -XX:+PrintFlagsFinal | find "InitialHeapSize"
    uintx InitialHeapSize                          := 100663296                           {product}

Find Maximum Heap Memory

Open windows command prompt and then enter the following command.

javaw -XX:+PrintFlagsFinal | find “MaxHeapSize”

Output


C:\Users\swamy>javaw -XX:+PrintFlagsFinal | find "MaxHeapSize"
    uintx MaxHeapSize                              := 1606418432                          {product}

Find ThreadStackSize , HeapSizePerGCThread Memory

Open windows command prompt and then enter the following command.

C:\Users\swamy>java -XX:+PrintFlagsFinal -version | findstr /i "HeapSize PermSize ThreadStackSize"
     intx CompilerThreadStackSize                   = 0                                   {pd product}
    uintx ErgoHeapSizeLimit                         = 0                                   {product}
    uintx HeapSizePerGCThread                       = 87241520                            {product}
    uintx InitialHeapSize                          := 100663296                           {product}
    uintx LargePageHeapSizeThreshold                = 134217728                           {product}
    uintx MaxHeapSize                              := 1606418432                          {product}
     intx ThreadStackSize                           = 0                                   {pd product}
     intx VMThreadStackSize                         = 0                                   {pd product}
java version "1.8.0_211"
Java(TM) SE Runtime Environment (build 1.8.0_211-b12)
Java HotSpot(TM) 64-Bit Server VM (build 25.211-b12, mixed mode)

JVM parameters for optimum memory and garbage collection (GC).

-server

-Xms24576M

-Xmx24576M

-XX:NewSize=6144M

-XX:MaxNewSize=6144M

-XX:PermSize=256M

-XX:MaxPermSize=256M

-XX:ThreadStackSize=300

-XX:MaxTenuringThreshold=0

-XX:SurvivorRatio=128

-XX:+UseTLAB

-verbose:gc

-Dsun.rmi.dgc.client.gcInterval=600000 

-Xloggc:<location of the GC logs>

-XX:-UsePerfData

-XX:+PrintVMOptions 

-XX:+TraceClassUnloading 

-XX:+DisableExplicitGC

-XX:+CMSParallelRemarkEnabled 

-XX:+PrintGCDetails

-XX:+PrintGCTimeStamps

-XX:+UseParNewGC

-XX:+UseConcMarkSweepGC 

-XX:ParallelGCThreads=<number of cpus>

-XX:CMSMarkStackSize=8M

-XX:CMSMarkStackSizeMax=32M

-XX:+UseCMSCompactAtFullCollection

-XX:CMSFullGCsBeforeCompaction=0

-XX:+ParallelRefProcEnabled

-XX:+CMSClassUnloadingEnabled

-XX:+CMSPermGenSweepingEnabled

-XX:+CMSIncrementalMode

-XX:+CMSIncrementalPacing

-XX:CMSIncrementalDutyCycleMin=0

-XX:CMSIncrementalDutyCycle=10

-XX:+UseCMSInitiatingOccupancyOnly

Exit mobile version