International Business Machines Corporation

Georgette L Kurdt

David Harold Surman

Michael J Jordan

Jeffrey Mark Nick

David Arlen Elko

Kelly B Pushong

Steven N Goss

Jeffrey William Josten

Ruth A Allen

Mark A Brooks

William Charles Neiman

Peter Dana Driever

Dennis J Dahlen

Steven Bruce Jones

Scott F Schiffer

Catherine Mary Moxey

Kenneth Glenn Rothwell

Riaz Ahmad

Ronald Morton Smith, Sr

Scott M Carlson

Jessie Yu

Michel H T Hack

Douglas W Westcott

Donald Crabtree

Denise M Sevigny

Gary M King

Judith A Wierbowski

Noshir R Dhondy

David E Whitney

Michael L Greenblatt

John Charles Nagy

Neil Alan Johnson

Chitta L Rao

Michael Burrill Phillips

Allen Carney

A computing system includes an application configured to request execution of at least one translation including at least one command. A first coupling facility is configured to perform a first modification process to modify a first structure based on a received command associated with an ongoing transaction. A second coupling facility includes a secondary circular queue loaded with first data blocks indicating the first modification process, and is configured to output a message response block (MRB). The application determines a most recent modification process performed by the secondary coupling facility based on the MRB.

Computing system including enhanced application performance based on last completed operation sequence value

A system includes a shared memory accessible by a plurality of members of a shared memory system, and a processor operably coupled to the shared memory system. The processor is configured to receive a command from an exploiting member of the plurality of members, the command instructing an update to a piece of shared data, perform the update to the piece of shared data, and send an invalidation signal to each other member of the plurality of members. An invalidation signal sent to a respective member indicates that a local copy of the piece of data stored by the respective member is no longer valid, and each invalidation signal is sent asynchronously with respect to processing of the command. The processor is further configured to return the results of the command to the exploiting member.

Management of shared memory using asynchronous invalidation signals

A coupling facility is coupled to one or more other coupling facilities via one or more peer links. The coupling of the facilities enables various functions to be supported, including the duplexing of structures of the coupling facilities. Duplexing is performed on a structure basis, and thus, a coupling facility may include duplexed structures, as well as non-duplexed or simplexed structures.

Controlling the state of duplexing of coupling facility structures

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 computer-implemented method for asynchronous duplexing between two computing devices includes obtaining a task for execution by a first computing device and executing the task. A first computing task completion identifier is assigned upon execution of the task. The task with the assigned first computing task completion identifier is transferred to a second computing device and executed. A second computing task completion identifier is assigned upon execution of the task. The first computing task completion identifier and the second computing task identifier are logged into a task management log for facilitating the recovery of the first computing device by comparing the first computing task completion identifier and the second computing task identifier for identifying tasks executed by the first computing device and requiring execution by the second computing device.

Asynchronous duplexing

A method for managing a cache structure of a coupling facility includes receiving a conditional write command from a computing system and determining whether data associated with the conditional write command is part of a working set of data of the cache structure. If the data associated with the conditional write command is part of the working set of data of the cache structure the conditional write command is processed as an unconditional write command. If the data associated with the conditional write command is not part of the working set of data of the cache structure a conditional write failure notification is transmitted to the computing system.

Conditional write processing for a cache structure of a coupling facility

In a networked data processing system, the updating of timing parameters is carried out via a process in which the detection of the loss of communications with the network is not immediately employed as an indication of parameter invalidity but rather the process employs a system specific delay which permits actions such as server or link recovery to occur without necessitating the declaration of timing parameter invalidity.

Coordinated timing network configuration parameter update procedure

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Georgette L Kurdt