Unisys Corporation

Steven Clarke

Craig F Russ

Michael J Saunders

James W Thompson

Clark C Kogen

Philip M Hoffman

James C Prestifilippo

Stephen R Bartels

Todd Little

A method of dynamically allocating the amount of input/output (I/O) rate capacity to partitions in a computer system includes determining a total amount of I/O rate capacity and an economic value of each partition within the partitioned computer system. The economic value is defined as a performance-valued product established for each partition wherein the sum of all performance-value products for each partition defines a total economic value for the computer. The I/O rate to be allocated to each partition is calculated to be a portion of the total amount of I/O rate capacity where the portion allocated to each partition is proportional to the economic value of that respective partition. The calculated rate allocations are recorded in memory which is accessible to each partition. After recording, each partition regulates its I/O usage according to the recorded allocation.

Dynamic distribution of I/O resources in a partitioned computer system

A stack frame associated with a procedure that can alter or affect a shared resource where the procedure is associated with a child stack and is declared by a parent stack is marked isolated. Isolated stack frames are allotted an additional predefined interval of processing time before commands such as terminate and interrupt applied to the child stack are executed. If the command is a terminate command, after the additional allotted time interval has passed, both child and parent stacks are terminated. If the command is an interrupt command, after the additional allotted time interval has passed, the child stack is interrupted. If the command is a resource-terminated command, an operator is permitted to allocate more resource time to the task or may terminate both parent and child stacks. If a parent stack is terminated, all child stacks of the parent are terminated.

Terminating a child process without risk of data corruption to a shared resource for subsequent processes

A file accessing scheme allows logical files to be processed outside of the native operating system and its logical I/O subsystem. When an application program wants to process a file outside of the native operating system, a file information block is built with a special type of file designated as 'virtual.' A pointer is provided within the file information block to a handler. The handler is a library that is external to the native operating system. The library processes the file without using the native operating system. Upon completion of the processing, the handler returns the operation results to the file information block and control is transferred back to the application program.

Virtual file system and method

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Newtown Square, PA, United States of America

Steven Clarke