Configuring Unwired Server Performance Properties

To optimize Unwired Platform performance, configure the thread stack size, maximum and minimum heap sizes, user options, and inbound and outbound messaging queue counts.

  1. Open Sybase Control Center.
  2. In the left navigation pane, expand the Servers folder and select a server.
  3. Select Server Configuration.
  4. In the right administration pane, select the General tab.
  5. From the menu bar, select Performance Configuration.
  6. Configure these properties, as required:
    • Host Name – the name of the machine where Unwired Server is running.
    • Thread Stack Size – the JVM -Xss option.
    • Minimum Heap Size – the minimum size of the JVM memory allocation pool, in megabytes. Sybase recommends that this value not fall 500 megabytes for a 32-bit operating system, but 1 gigabyte is recommended. For a 64-bit operating system, Sybase recommends 1 gigabyte for a normal configuration, but 2 gigabyte for a stress configuration (which can vary depending on what RAM is available).
    • Maximum Heap Size – the maximum size of the JVM memory allocation pool, in megabytes. For a 32-bit operating system, Sybase recommends a 1.5 gigabyte maximum heap size value. For a 64-bit operating system, Sybase recommends 1 gigabyte for a normal configuration, but 4 gigabyte for a stress configuration (which can vary depending on what RAM is available).
    Note: The synchronization differencing algorithms are a key feature of RBS; this technology runs in the JVM. You must provide adequate memory to these components. If these algorithms are memory starved, the JVM spends an inordinate amount of time garbage collecting memory, and synchronizations back up in the internal queues. You can monitor process memory usage with tools like SysInternal’s Process Explorer to determine the actual amount of memory in use by Unwired Platform, and adjust the JVM heap size accordingly
    Note: Always leave 4 gigabytes for the running of the OS and other applications that may exist on the server.
  7. (Optional) Expand the Show optional properties section and configure these properties, as required:
    • User Options – other JVM options. For example, you can enable JVM garbage collection logging by setting -XX:+PrintGCDetails.
    • Inbound Messaging Queue Count – the number of message queues used for incoming messages from the messaging-based synchronization application to the server. Sybase recommends a choose a value that represents at least 10% of active devices.
    • Outbound Messaging Queue Count – the number of message queues used for outbound messages from the server to the messaging-based synchronization application. Sybase recommends a choose a value that represents at least 50% of active devices. However, if you are running 32-bit operating system, do not exceed a value of 100% of active devices.
    • Subscribe Bulk Load Thread Pool Size – the maximum number of threads allocated to initial bulk load subscription operations. The default value is five. Setting the thread pool size too high can impact performance.
    Note: If you increase either queue count property, ensure you also increase the MaxThread property in the <hostname>_iiop1.properties file.
  8. Click Save.
  9. If your server is installed as a Windows service:
    1. Stop Unwired Server.
    2. Open a command prompt.
    3. Run sup-server-service.bat remove.
    4. Run sup-server-service.bat install auto.
    5. Restart Unwired Server.
Parent topic: Server Administration Overview
Related concepts
Synchronization Model Performance Tuning
Related tasks
Configuring the IIOP Socket Listener