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Asked: 2011-06-30 11:07:01 +0800 CST

Set OOM killer adjustment for process on startup?

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Is there a way to set the OOM killer adjustment value right when a daemon process (Apache in my case) starts? I would like to give the Apache processes a higher likelihood of being killed and make it virtually impossible for some more vital services to be killed by the OOM killer.

memory-usage

2 Answers

  1. Best Answer

    I think you best bet would be to add a separate script as part of your init.d. In it, you will want to do something like this

    echo 15 > /proc/`pidof APP_NAME`/oom_adj

    The pidof APP_NAME will retrieve the process ID of the app with that name. Writing 15 to /proc/{pid}/oom_adj ups the "badness" of process {pid}, making it more likely to be killed by OOM killer.

    The article Taming the OOM killer from LWN.net also hints at some other ideas that were suggested to allow specification of an "oom_victim", but I am not sure any of them are actually in the kernel.

    BTW: The best solution would be to avoid having to use the OOM Killer in the first place. Remember Micro$oft's unwritten motto: There's no problem more RAM can't fix.

    [Note: If there could be more than one of these processes, you may want to revise the code a bit.]

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  2. For ubuntu 15.04, this has changed.

    The correct way to set the oom setting for a pid is 

    echo 42 > /proc/666/oom_score_adj

    instead of /proc/666/oom_adj

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