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JAVA - Out of Memory

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  • M

    Our server installation has crashed twice so far in the past week due to this:

    ERROR 2017-08-01T15:52:21,362 (com.serotonin.m2m2.rt.maint.BackgroundProcessing$RejectableWorkItemRunnable.run:559) - Error in work item
java.lang.OutOfMemoryError: Java heap space

    Version: core 3.1.1+20170620163725 (Build number: 20170620163725) - Enterprise

    We used to run it with 2GB without any problems, but since we have the available memory I've increased it to 4GB from now on.

    What's the permanent way to increase java memory size?

    Is this the method I should?

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  • phildunlap

    Hi mihai,

    Arguments to control the heap size are passed in the ext-available scripts. You probably want a script like....

    #!/bin/bash
case "$1" in
    init)
        # Startup with Java Memory setup for Large installation
        JAVAOPTS="$JAVAOPTS -Xms3200m -Xmx3200m"
        ;;
esac

    if you're only running Mango on that machine. Place it in ext-enabled.

    Did anything change in the configuration recently?

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  • M

    There was one major change, which was the upgrade to 3.0.

    So I've created a symbolic link as in my original post, since I noticed that it's essentially the same instructions that you gave.

    How can I confirm that the changes worked?

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  • phildunlap

    You can see if the JVM has the arguments by doing a ps $(pidof java) at the command line. If you've passed the argument there, Java got it. You should also see it reflected on the internal metrics page.

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  • M

    I've been away for two weeks but we haven't had any more crashes since increasing the heap size. Thank you.

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  • phildunlap

    Glad to hear it!

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  • dan

    Old thread I know, but I've been having this same issue on a RPi installation.
    I hard set the memory and I think it might have fixed the issue.

    Cheers
    Dan

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