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Analysing SAP Java Memory Usage in Unix/Linux


I need to analyze the SAP Java memory usage of Unix /Linux machine..NW 7.0

Please guide with the commands and steps..complete prcedure.

Based on it I should decide whether to create a new server node (or) increasing heap size

Thanks in advance

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  • author's profile photo Former Member
    Former Member
    Posted on Dec 15, 2011 at 09:52 PM


    Do you have performance problems?

    How many CPU's are in the server?

    Did you check Log Configuration for delays or errors?

    Did you tune any exisiting parameters?

    You can add the nodes only if there is performance problems. You may think of adding one node to start with

    Proper number of server nodes within an instance:

    u2013 #ServerNodes = availableMemory / (JavaHeapPermSpaceStack)

    You can calculate the server nodes based on below formula

    No. of server Node = (RAM you want to assign or available RAM in GB)/2.5 ============> for 64-bit system

    No. of server Node = (RAM you want to assign or available RAM in GB)/1.5 ============> for 32-bit system

    Hence as per above discussion, we should go with 5 server nodes means,

    5 = RAM/2.5 (Assuming you are on 64-bit platform)

    i.e. RAM = 12.5 GB

    2). u2013 Configure JVM heap according to Note 723909 and Note 1008311 - Recommended Settings for NW 7.0 >= SR2 for the AIX JVM (J9)

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    • Former Member Former Member


      Based on your system configuration, maintain JVM parameters based on SAP Note 723909 and you should be good.

      Make sure your swap memory is configured as 3*Physical memory.

      On a rough estimate, each server node requires 4GB of memory for a 64 bit system and 2 to 3 GB for a 32 bit system. Check for available server resources and configure memory parameters accordingly.

      Hope this helps.



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