WebSphere WebSphere Application Server Express, Version 6.0.x Operating Systems: AIX, HP-UX, Linux, Solaris, Windows

Setting tuning properties by editing the sib.properties file

Use this task to set tuning properties for the service integration environment by editing the sib.properties file

Why and when to perform this task

You can set tuning properties to improve the performance of components in the service integration environment. The properties you can set are listed in the tables below:

Properties for a messaging engine

Name Value
sib.trm.retry The messaging engine to messaging engine connection retry interval in seconds. The retry interval is the time delay left between attempts to contact neighboring messaging engines with which communications contact should exist. The default retry interval is 30 seconds.

Properties for the component of a messaging engine that manages the data store

Name Value
sib.msgstore.discardableDataBufferSize The size in bytes of the data buffer used by the messaging engine to contain data for which the quality of service attribute is best effort nonpersistent. The messaging engine holds this data entirely within this memory buffer and never writes this data to the data store. When the messaging engine adds data to this buffer, for example when the messaging engine receives a best effort nonpersistent message from a client, the messaging engine might discard data already in the buffer to make space. This behavior enables the messaging engine to discard best effort nonpersistent messages.

The discardable data buffer contains all data for which the quality of service attribute is best effort nonpersistent. That data comprises data both that is involved in active transactions, and any other best effort nonpersistent that the messaging engine has neither discarded nor consumed. The messaging engine can discard only data that is not involved in active transactions.

Tip: If the messaging engine attempts to add data to the discardable data buffer when insufficient space remains after discarding all the data that is not involved in active transaction, the messaging engine throws a com.ibm.ws.sib.msgstore.OutOfCacheSpace exception. Client applications can catch this exception, wrapped inside API-specific exceptions such as javax.jms.JMSException.

The sib.msgstore.discardableDataBufferSize property of the messaging engine controls the size of the discardable data buffer. You specify the value of this property in bytes. The default value is 320000, which is approximately 320 kilobytes.

sib.msgstore.cachedDataBufferSize The size in bytes of the data buffer used by the messaging engine to contain data for which the quality of service attribute is better than best effort nonpersistent and which is held in the data store. The purpose of the cached data buffer is to optimize the performance of the messaging engine by caching in memory the data that the messaging engine might otherwise need to read from the data store. As it writes data to the data store and reads from the data store, the messaging engine attempts to add that data to the cached data buffer. The messaging engine might discard data already in the buffer to make space.

The sib.msgstore.cachedDataBufferSize property of the messaging engine controls the size of the cached data buffer. You specify the value of this property in bytes. The default value is 320000, which is approximately 320 kilobytes.

sib.msgstore.transactionSendLimit The maximum number of operations that the messaging engine includes in each transaction. For example, each JMS send or receive is an operation that counts towards the transaction send limit. The default value is 100.

To set these properties by editing the sib.properties file, perform the following steps:

Steps for this task

  1. Navigate to the profile_root/properties directory, where profile_root is the directory in which profile-specific information is stored.
  2. If the directory does not contain a sib.properties file, then copy the template sib.properties files from the install_root/properties directory, where install_root is the root directory for the installation of IBM WebSphere Application Server.
  3. Using a text editor, open the sib.properties file and add the name and value of the property that you want to set. The format is name=value. For example sib.trm.retry=60
Related tasks
Setting tuning properties of a messaging engine
Controlling the memory buffers used by a messaging engine
Tuning the JDBC data source of a messaging engine

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Last updated: 2 Aug 2005
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