International Business Machines Corporation

John Charles Nagy

Jeffrey Paul Kubala

David Harold Surman

Steven N Goss

Jeffrey Mark Nick

Peter Dana Driever

Dennis J Dahlen

Georgette L Kurdt

Wendell W Wilkinson

Gary M King

Ira Glenn Siegel

A computing system is configured to maintain equivalency of independent structures located in different coupling facilities. The computing system includes a first coupling facility and a second coupling facility different from the first coupling facility. The first coupling facility includes a first structure that receives a first data modification based on a modification command requested by an application executed by an operating system. The second coupling facility in signal communication with the first coupling facility and includes a secondary structure that receives a second data modification based on the first data modification applied to the first structure. The first coupling facility outputs a Push List Structure Object (PLSO) command data block to the second coupling facility. The PLSO command data block indicates the first data modification applied to the first structure.

Computing system including PLSO command to maintain equivalency between independent coupling facilities

A method and apparatus for dynamically controlling the dispatching of a coupling facility operating in a logical partition sharing a processor resource with one or more other logical partitions issuing requests to the coupling facility. A plurality of coupling facility dispatching modes differing in their relative dispatch duration are defined. One dispatching mode is initially selected, and the number of requests received from the other logical partitions within a predetermined interval while in a selected dispatching mode is determined. Transitions between the defined dispatching modes are made in accordance with the number of requests received within the sampling interval in the selected dispatching mode. The method and apparatus are especially suitable for controlling the dispatching of a backup coupling facility, whose polling loop would otherwise consume processor resources usable by other logical

Method and apparatus for dynamically controlling the execution of a request handler on a processor resource

A logical partition includes at least one dedicated logical processor and at least one shared logical processor. The dedicated processor is a different type of processor than the shared processor, and/or the dedicated processor executes a different dispatching procedure than the shared processor. The use of the shared processor automatically ramps up, as the arrival rate of requests forwarded to the logical partition increases. Furthermore, the use of, the shared processor automatically ramps down, as the arrival rate decreases.

Management of a logical partition that supports different types of processors

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John Charles Nagy