How OOM Killer Affects Processes on Linux


Out-of-memory (OOM) killer is a daemon on most Linux machines that watches memory usage on a machine and can potentially terminate processes with usage. Software packages published by Synametrics have a configuration parameter that caps the maximum memory used. A built-in garbage collector constantly cleans up memory usage. However, if the amount of used memory reaches very close to the maximum configured memory, the garbage collector becomes very active and consumes a lot of CPU. This makes the process a good candidate for getting terminated by OOM.

This page describes how to check if OOM has terminated a process and how to configure it. This article assumes you're using Syncrify.

Symptoms

Syncrify server stops without any reason, and the log file ($INSTALL_DIR\logs\Syncrify.log) does not report any errors.

Troubleshooting

Try the following steps:

  • Connect to your Linux box using SSH
  • Run the following command:
    grep -i kill /var/log/messages*
  • You will see the following message as the result if OOM killed Syncrify:
    host kernel: Out of Memory: Killed process 8595 (syncrify).

Next Steps

You could take several steps after confirming OOM is indeed terminating Syncrify. For example:
  • Configure OOM. Click here for some tips.
  • Add more memory to the machine.

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