Download PDF (1.3 MB) - IBM Redbooks

Consider the following hints when tuning the connection pools:
► API calls for task list and process list queries might take more time to respond, depending
on the tuning of the database and the amount of data in the database.
► Ensure that concurrency (parallelism) is sufficiently high to handle the load and to use the
processor. However, increasing the parallelism of API call execution beyond what is
necessary can negatively influence response times. Also, increased parallelism can put
excessive load on the BPC database. When tuning the parallelism of API calls, measure
response times before and after tuning, and adjust the parallelism if necessary.
4.8.5 Tuning intermediate components for concurrency
If the input business object is handled by a single thread from end to end, the tuning for the
edge components is normally adequate. In many situations, however, multiple thread
switches exist during the end-to-end execution path. Tuning the system to ensure adequate
concurrency for each asynchronous segment of the execution path is important.
Asynchronous invocations of an SCA component use an MDB to listen for incoming events
that arrive in the associated input queue. Each SCA module defines an MDB and its
corresponding activation specification (JNDI name is sca/module name/ActivationSpec). The
SCA module MDB is shared by all asynchronous SCA components within the module,
including SCA export components. Take this shared state into account when you configure
the maxConcurrency property value of ActivationSpec. SCA module MDBs use the same
default thread pool as those for JMS exports.
The asynchronicity in a long-running business process occurs at transaction boundaries (see
3.2.9, “Transactional considerations” on page 38 for more details about settings that affect
transaction boundaries). BPE defines an internal MDB and its ActivationSpec as
BPEInternalActivationSpec. The maxConcurrency parameter must be tuned by following the
same guideline as for SCA module and JMS export MDBs (as described in 4.7.3, “Tuning for
maximum concurrency” on page 64).
The only issue is that only one BPEInternalActivationSpec exists for a single Business
Process Manager server.
4.9 Mediation flow component tuning
Additional configuration options are relevant to tuning Mediation Flow Components. These
are described in this section.
See 5.2, “Mediation Flow Component settings” on page 104 for a suggested set of initial
values to use.
4.9.1 Tuning the database if using persistent messaging
If you use persistent messaging, the configuration of your database is important. Use a
remote DB2 instance with a fast disk array as the database server. You might benefit from
tuning the connection pooling and statement cache of the data source.
For more information about tuning DB2, see the following sections:
► 4.13, “General database tuning” on page 80
► 4.14, “DB2-specific database tuning” on page 82
See the relevant references in “Related publications” on page 107.
Chapter 4. Performance tuning and configuration 75