Configuring the Java virtual machine heap size

This topic describes how to configure the Java virtual machine (JVM) heap size when you are initiating a model build process.

During a model build process, the Data Training subtask initiated by the BMC AMI Ops Insight Tomcat server utilizes a JVM heap size of 40 GB. If the allocation fails, you might get the following error: 

JVMJ9VM015W Initialization error for library j9gc29( 2): Failed to instantiate heap. 40G requested Error: Could not create the Java Virtual Machine
is issued and model creation fails.

Related topics

Installing

Configuring-after-installation

To override the default memory

Perform the following steps to override the default 40 GB memory required by the Data Training subtask:

  1. Edit the Tomcat AMITCJCL in your system PROCLIB and add export MODELGEN_MEMORY in environment variables as follows:

    ---------------------------------------------------------------------
    Set AMI modelgen env variables
    ----------------------------------------------------------------------
    export MODELGEN_PATH=$AMI_INSTALL_PATH/datatrain

    export MODELGEN_JAVA=$AMI_INSTALL_PATH/java/J17.0_64

    export MODELGEN_MEMORY=10g                   <=== Ex. 40g, 1g, 1000m

  2. Update AMITCJCL to force the Tomcat server to pick up AMITCEN6 from UBMCSAMP as follows:

    //STDENV DD *,SYMBOLS=JCLONLY < STDENV shell script
    export AMI_INSTALL_PATH=&AMIINST/aoihome
    export AMI_DATA_PATH=&AMIINST/aoidata
    export AMI_HOME=&AMIINST/aoihome/oi_home
    //              DD DISP=SHR,
    //                    DSN=&CNFGLIB1(&TCENV) < STDENV shell script
  3. Restart the Tomcat server.

 

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