Performance guidelines

This page provides basic guidelines that can help you ensure optimal performance.

• Verify that you have enough system capacity. For more information, see Prerequisites for installing and running WebSphere Application Server - Express V5.1 for iSeries in the Installation topic. You can also use the IBM eServer Workload Estimator or obtain professional services.

• Verify that hardware resources are allocated efficiently.
  • Provide sufficient memory and activity level in the *BASE memory pool.
  • If availability and performance are high priorities, it is recommended that you allocate WebSphere Application Server - Express processing to a separate storage pool.
  You can adjust memory pools manually or automatically.

• Verify that you have the latest WebSphere Application Server - Express Group PTF. For information about PTFs and to download the most recent Group PTF, see WebSphere Application Server for iSeries: PTFs.

• Tune the JVM garbage collector. For information about garbage collection, see Performance resources.

• Configure queues for your application server components. See these topics for more information:
  • Queuing network
  • Thread pool settings
  • Connection pool settings

• If your application server uses public key encryption, use hardware accelerators to improve performance. For information about the hardware accelerators that are available for iSeries, see the appropriate document based on your version of i5/OS:
  • For V5R2, V5R3, and V5R4: iSeries Cryptographic Offload Performance Considerations

• Design applications to optimize performance. Performance resources includes links to resources that can help you develop efficient Java applications.

• Use efficient SQL and JDBC practices to optimize data access.