Work Item Server

The WIS handles the listing of work items in the queues. The process executable is SWDIR\etc\wisrpc. A number of WIS processes can be run and this is controlled by the Process Sentinels.

A WIS process is one instance of a Work Item Server and caches work queues that the WQS has allocated to it. Every iProcess work queue is hosted by a WIS process and each WIS can process more than one work queue. The iProcess Engine runs two WIS processes by default but you can increase or decrease this number using the SWDIR\util\swadm utility.

The WIS processes are multi-threaded processes. Different threads are used to perform different tasks - for example, responding to RPC requests, caching queue information, filtering queues, or updating CDQP information.

Note: Version 10.4 of the TIBCO iProcess Engine introduced multi-threaded WIS processes. This improved WIS performance significantly, making it possible to reduce the default number of WIS processes from 6 (the pre-Version 10.4 default) to 2.

There are many work queue performance issues related to the number of WIS processes you have, work queues they process, the threads they use for different tasks and so on. For more information, see the “Administering the Work Queue Server and Work Item Servers” in the TIBCO iProcess Engine: Administrator's Guide.

The WIS processes maintain a cache of the information they contain (which is the user’s work queue). This cache is synchronized with the same information stored in the user or group’s work queue (staffo database table). You can view the information in this table using SWDIR\util\plist -m.