Thursday, March 6

Difference between execute queues and work Managers ?

Execute Queues are available till WLS 8.1 and Work-managers are available from WLS 9.2
and the main difference between these two is Workmanagers are self tuned, that means it will shrink and increase whenever it requires rather than fixed to the maximum number of threads there by causing some issues on high load.

Understanding the Differences Between Work Managers and Execute Queues:

The easiest way to conceptually visualize the difference between the execute queues of previous releases with work managers is to correlate execute queues (or rather, execute-queue managers) with work managers and decouple the one-to-one relationship between execute queues and thread-pools.

For releases prior to WebLogic Server 9.0, incoming requests are put into a default execute queue or a user-defined execute queue. Each execute queue has an associated execute queue manager that controls an exclusive, dedicated thread-pool with a fixed number of threads in it. Requests are added to the queue on a first-come-first-served basis. The execute-queue manager then picks the first request from the queue and an available thread from the associated thread-pool and dispatches the request to be executed by that thread.

For releases of WebLogic Server 9.0 and higher, there is a single priority-based execute queue in the server. Incoming requests are assigned an internal priority based on the configuration of work managers you create to manage the work performed by your applications. The server increases or decreases threads available for the execute queue depending on the demand from the various work-managers. The position of a request in the execute queue is determined by its internal priority:

The higher the priority, closer it is placed to the head of the execute queue.
The closer to the head of the queue, more quickly the request will be dispatched a thread to use.
Work managers provide you the ability to better control thread utilization (server performance) than execute-queues, primarily due to the many ways that you can specify scheduling guidelines for the priority-based thread pool. These scheduling guidelines can be set either as numeric values or as the capacity of a server-managed resource, like a JDBC connection pool.

What is workmanager?

A. Work Managers  allow to configure a set of guidelines that Weblogic Server uses to prioritize and organize the execution of tasks in an optimized way.


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