症状

• It takes forever to access a JIRA page a short while after JIRA is started.
• Memory seems to be used up very fast, even though it never reaches -Xmx.
• Garbage Collection(GC) takes a very long to finish.
  
  Sample GC Viewer:
  
  

診断

• JIRA is installed in a Virtual Machine(VM) using VMWare.
• When JIRA is unresponsive, attempting to stop it results in the following error in the terminal:

Java HotSpot(TM) 64-Bit Server VM warning: INFO: os::commit_memory(0x0000000083000000, 1398276096, 0) failed; error='Cannot allocate memory' (errno=12)
#
# There is insufficient memory for the Java Runtime Environment to continue.
# Native memory allocation (mmap) failed to map 1398276096 bytes for committing reserved memory.
# An error report file with more information is saved as:
# /tmp/hs_err_pid2660.log
The stop command failed. Attempting to signal the process to stop through OS signal.
Killing Tomcat with the PID: 1929
The Tomcat process has been killed.

原因

Memory Reservation is not enabled for the VM, preventing JIRA from getting sufficient memory allocated for it in a timely manner.

ソリューション

Enable Memory Reservation for the VM.

回避策

Set the minimum and the maximum memory to the same amount as per Increasing JIRA Memory.

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