What is the purpose of /proc/sys/vm/drop_caches in Red Hat Enterprise Linux?

Solution Verified - Updated -

Issue

  • What's the purpose of /proc/sys/vm/drop_caches in Red Hat Enterprise Linux?
  • How to release cache memory using /proc/sys/vm/drop_caches?
  • New process cannot be started due to insufficient free memory, how to free additional memory?
  • Inactive memory not being released, how to free memory?

Environment

  • Red Hat Enterprise Linux

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