Use this to simplify the calculation of your OIM Oracle installation. It helped us atleast :-).

CalculateOimThreads.java

/**
 * @author <a href="mailto:[email protected]">vegaraa</a>
 * @version ??.10.2016
 * @link https://support.oracle.com/epmos/main/downloadattachmentprocessor?attachid=1539554.1%3AOIM11GR2_TUNING&action=inline
 * @link https://docs.oracle.com/cd/E52734_01/core/ASPER/oim.htm#ASPER495
 */
public class CalculateOimThreads {

    private static final int NUM_DB_CPU_INSTANCES = 1;
    // Look at the scheduled task in OIM
    private static final int NUM_EVALUATE_USERS_THREADS = 1;
    // duh..
    private static final int NODES = 1;

    // Summary of JDBC Data Sources > oimOperationsDB
    private static int dbConnections = 0;

    public static void main(String... args) {
        calculateOIMOperationsDB();
        calculateOIMWorkManager();
        calculateOIMMDBWorkManager();
        calculateOIMAuditWorkManager();
        calculateOIMUIWorkManager();

    }

    private static void calculateOIMOperationsDB() {
        //(8*# DB CPU)
        dbConnections = Math.round(8 * NUM_DB_CPU_INSTANCES) / NODES;
        System.out.println("oimOperationsDB => (connections) " + dbConnections);
    }

    private static void calculateOIMWorkManager() {
        //Round(2/3[(total number of DB connections -5)/n)-10])
        System.out.println("OIMWorkManager => " + Math.round((((dbConnections - NUM_EVALUATE_USERS_THREADS) / NODES) - 10) * 0.66));
    }

    private static void calculateOIMMDBWorkManager() {
        //Round(1/3[(total number of DB connections -5)/n)-10])
        System.out.println("OIMMDBWorkManager => " + Math.round((((dbConnections - NUM_EVALUATE_USERS_THREADS) / NODES) - 10) * 0.33));
    }

    private static void calculateOIMAuditWorkManager() {
        // no calculation - just recommended
        System.out.println("OIMAuditWorkManager => " + 5);
    }

    private static void calculateOIMUIWorkManager() {
        // no calculation - just recommended
        System.out.println("OIMUIWorkManager => " + 10);
    }
}