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TeamCity - OutOfMemoryError

Whilst upgrading our TeamCity server from 6.5 to 7.x, I encountered an error:

Unexpected error occurred inside Alarm task: java.lang.OutOfMemoryError: GC overhead limit exceeded

After a bit of looking around and sifting through some very weird articles I was able to find some good information on this. Basically, the JVM starts by default with 512mb of memory and it was struggling to process our 300+ build configurations with this. In order to fix it I had to do the following:

  • Go to TeamCity webserver
  • Open CMD
  • cd <TeamCity root dir>
  • cd bin
  • teamcity7w.exe //ES//TeamCity
    • If you are on TeamCity 6.x then you need to run teamcity6w.exe rather than ..7w
  • This will open the following dialog:

image

Go to the Java tab and change the maximum memory pool entry to something other than 512mb

image

Restart the service and all should be well with the application start-up.