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– Use an appropriate hardware configuration for performance measurement (for
example, notebooks and desktops are not appropriate for realistic server performance
evaluations).
– If hardware virtualization is used, ensure that adequate processor, memory, and I/O
resources are allocated to each virtual machine. Avoid overcommitting resources.
– Minimize network latency, and ensure sufficient network bandwidth, between all
systems in the configuration, which includes the following items:
• Between the Process Portal clients and the Process Server
• Between the Process Server and its databases
• Between the Process Designer clients and the Process Center
• Between the Process Center and its database
– Do not run production servers in development mode or with a development profile.
– Tune external service providers and external interfaces to ensure that they do not
cause a system bottleneck.
– Configure message-driven bean (MDB) activation specifications.
– Configure for clustering, where applicable).
– Configure thread pool sizes.
– Configure settings of data sources for connection pool size and prepared statement
cache size. Consider using non-XA data sources for Common Event Infrastructure
data when that data is non-critical.
– Increase the maximum number of connections in the data pool to greater than or equal
to the sum of all maximum thread pool sizes.
Business Processing Modeling Notation (BPMN) business processes
– Set bpd-queue-capacity to 10 times number of physical processors, capped at 80.
– Set the max-thread-pool size to 30 plus 10 times the number of physical processors,
capped at 110.
– Increase log file size for the Process Server database to 16,384 pages.
– Enable file system caching for the Process Server database:
db2 alter tablespace userspace1 file system caching
– Exclude the table SIBOWNER from automatic runstats execution.
– Ensure that database statistics are up to date.
Business Process Choreographer (for BPC business processes)
– Use Work Manager-based navigation for long running processes, and optimize the
message pool size and intertransaction cache size.
– Use query tables to optimize query response time.
– Optimize Business Flow Manager resources:
• Database connection (Business Process Choreographer database)
• Activation specification (BPEInternalActivationSpec)
• Java Message Service (JMS) data source connection (BPECF and BPECFC)
– Optimize the database configuration for the Business Process Choreographer
database (BPEDB).
– Optimize indexes for SQL statements that result from task and process list queries
using database tools such as the DB2 design advisor.
– Turn off state observers that are not needed (for example, audit logging).
Chapter 4. Performance tuning and configuration 51