Heap memory size for Server Manager, Method Server and Background Method Server in Windchill PDMLink and FlexPLM

• How to change heap memory size for Server Manager, Method Server and Background Method Server
• Administrator receives Java Management Extensions(JMX) Notification mails with message like:
  • Heap percentage usage threshold exceeded
  • Heap percentage usage threshold no longer exceeded
  • Heap percentage usage threshold still exceeded
  • Garbage collection time threshold exceeded; percentage time in garbage collection
  • Garbage collection time threshold still exceeded; percentage time in garbage collection
  • Garbage collection time threshold no longer exceeded; percentage time in garbage collection
  • Low Memory Detector wt.jmx.notif.memory java.management.memory.collection.threshold.exceeded poolName=PS Old Gen
  • java.lang.OutOfMemoryError heap space
  • wt.method.MemoryUsageRedirectStrategy - Usage threshold exceeded
  • wt.jmx.notif.memory message=Memory usage exceeds collection usage threshold
• MethodServer shuts down with error java.lang.OutOfMemoryError: Java heap space
• MethodServer stopped with error: java.lang.OutOfMemoryError: GC overhead limit exceeded
• MethodServer crushed due to Out Of Memory
• Windchill getting Shutdown automatically and will be up after some time
• If PTC System Monitor was configured, may receive notifications below

  Application Process Unhealthy
  GC health of process is not ok. The process constantly spent more than 15% of it's execution time for Garbage Collection in the last 5 minutes

• What is the unit of wt.manager.maxHeap
• Java Virtual Machine(JVM) fails to start with error: There is insufficient memory for the Java Runtime Environment to continue
• Windchill services taking more than expected time to start
• After rehosting, the Method Server (MS) fails to start and gets stuck at the following line: 

INFO  [main] wt.util.WTPropertiesWatcher  - wt.properties being watched at: /apps/ptc/Windchill/codebase/wt.properties
INFO  [main] wt.method.server.startup  - Starting services - class = wt.services.StandardServicesHandler
INFO  [main] wt.pom.properties  - wt.pom.delete.triggerClassNames=
INFO  [main] wt.pom.properties  - wt.pom.delete.bypassReferentialIntegrityClassNames=wt.iba.value.ReferenceValue,wt.iba.value.AbstractContextualValue,wt.epm.EPMCADNamespace
INFO  [main] wt.system.out  - IEProperties IEConf: /apps/ptc/Windchill