CPU operation may be enhanced by providing for the automatic dispatching of selected programs, when using SVC (Supervisor Call) instruments for the linkage between problem programs and system control programs.
CPU operation may be enhanced by providing for the automatic dispatching of selected programs, when using SVC (Supervisor Call) instruments for the linkage between problem programs and system control programs.
Testing new or changed Initial Program Load (IPL) text previously required using an Operating System (OS) Utility Program to place the assembled object deck for IPL on a disk pack, as part of the Utility Program analy...
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Testing new or changed Initial Program Load (IPL) text previously required using an Operating System (OS) Utility Program to place the assembled object deck for IPL on a disk pack, as part of the Utility Program analyze function. Then track 0 of this analyzed pack had to be copied by the utility dump function to an OS SYSRES pack. A quick bypass to this lengthy procedure is provided by loading an IPL object deck directly into core and passing control to it.
Brownian motion is shown to be a useful tool in analysing some sorting and tree manipulation algorithms. Some of these results could perhaps be obtained by combinatorial techniques but probably with much effort. Moreo...
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Brownian motion is shown to be a useful tool in analysing some sorting and tree manipulation algorithms. Some of these results could perhaps be obtained by combinatorial techniques but probably with much effort. Moreover, the B. M. approach sheds some light on the asymptotic behaviour of many algorithms.
Distributed memory, message passing (DMMP) parallel architectures, such as the intel iPSC(R) computer system, provide the processing power and memory to solve very large parallel programming problems. However, their l...
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Distributed memory, message passing (DMMP) parallel architectures, such as the intel iPSC(R) computer system, provide the processing power and memory to solve very large parallel programming problems. However, their large grain process model and distributed memory complicate the programmer's view of the system. Extensions have been created for interwork II's global object name space in order to support arrays of objects;interwork II distributes the element objects among the processing nodes so as to balance the number on each node. Indexed objects simplify the programmer's view of parallel architectures by enabling related data to be automatically partitioned among the processing nodes. They also speedup computations by allowing these data to be operated on in parallel. This mechanism has proved useful as the basis for constructing a large, parallel simulation.
A method is provided to allow a continuous Information Management System (IMS) conversation while interacting with multiple IMS transactions. This provides a work station environment for an untrained user, rather than...
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A method is provided to allow a continuous Information Management System (IMS) conversation while interacting with multiple IMS transactions. This provides a work station environment for an untrained user, rather than a transaction by transaction environment where the transactions must be known as defined to IMS. Rules by user type provide the necessary control and security for the transactions. This eliminates the need for passwords.
The history of IBM efforts in the area of Private Line Switching, the functions that the 3750 Switching System can perform, as well as its general architecture are recalled, with a special emphasis on the choices whic...
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The history of IBM efforts in the area of Private Line Switching, the functions that the 3750 Switching System can perform, as well as its general architecture are recalled, with a special emphasis on the choices which have an influence on the programming. The operational program is then described with its synchronous and asynchronous parts, with a special emphasis on the concepts which are peculiar to the 3750. The utility programs such as error handling, maintenance and service, are also explained as well as an illustration of the progress of a call and of data collection. The last part of the paper describes the logistics of the program, such as the simulation program, the tests, as well as the generation of the program and the tables according to the specific configuration of each user.
A number of parameters, such as the time of reply, the length of the queue, etc. can be estimated with the aid of the queueing models for computation systems. By setting out from a model of Wei-Chang for time-shared c...
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A number of parameters, such as the time of reply, the length of the queue, etc. can be estimated with the aid of the queueing models for computation systems. By setting out from a model of Wei-Chang for time-shared computation systems, the authors evaluate the generating function of distribution of the Markov chain associated with the model.
In developing complex software systems with multiprocessing and/or real-time features, serious problems often arise in the interfaces between independent processes. The techniques described show how the relationships ...
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In developing complex software systems with multiprocessing and/or real-time features, serious problems often arise in the interfaces between independent processes. The techniques described show how the relationships between such processes can be automatically analyzed and reported to the programmer or designer. The language constructs of SPL/I are used as an example to show how this information can be derived directly from the system source code. This analysis provides early confirmation to developers of actual interprocess linkage, allowing errors or unwanted side effects to be discovered quickly, and provides valuable documentation assistance.
This is a page replacement process utilizing a set of ″Interreference Interval Probabilities″ in making page replacement decisions. This technique reduces the number of incorrect steal decisions made, by advising th...
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This is a page replacement process utilizing a set of ″Interreference Interval Probabilities″ in making page replacement decisions. This technique reduces the number of incorrect steal decisions made, by advising the paging supervisor of a specific page's expected interreference time and the probabilities thereof. The accessed probability value is then employed in the page replacement decision. Such a process can be applied to a single group of ″different″ pages (those involved in conversational/interactive processes), or to multiple groups of pages (each group having a different set of interreference interval probabilities) simply by making provision for multiple Probability Tables.
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