What is cache in "free -m" output and why is memory utilization high for cache?

Solution Verified - Updated -

Issue

  • What is cache in free -m output and why is memory utilization high for cache?
  • How to check memory capacity required for Heap to create new server instance of JBoss by analyzing the free command output in JBoss, if there is already one instance of JBoss running?
  • Why are large amounts of memory used by cache?
  • Physical memory fully utilized frequently in cache

Environment

  • Red Hat Enterprise Linux (All Releases)
  • JBoss Enterprise Application Platform (EAP) - All versions

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