Hewlett-packard Development Company, L.P.

Digital Equipment Corporation

Brian F Wibecan

Kevin W Harris

John A Bircsak

The invention comprises a technique for allocating memory in a multiprocessing computing system. In a first aspect, a method in accordance with the present invention begins by collecting a plurality of descriptions of shared data items. The shared data items are then dynamically allocated into a local virtual address space shared by a plurality of CPUs within a single node. The description of this allocation is the then stored. The method then accesses the stored allocation description to determine the virtual memory address of a shared data item. Whenever a data request is generated, it is determined from this virtual memory address whether the shared data item is available within the shared local virtual address space. If so, the access is performed in the shared local virtual address space. If the data is unavailable in the local virtual address space, it is accessed from a remote memory space.

Technique for referencing distributed shared memory locally rather than remotely

In a computer system, events indicative of the performance of the system are generated by system hardware and software. A user requests control of counters of different designs for counting the events. If the request for control of the counters is granted, a set of events is selected for monitoring according to predetermined attributes which characterize the events. A determination is made if the events of the set are valid, and they are determined to be valid, each event of the set are coupled to a corresponding one of the counters. The counters are then enabled to count the events of the set.

Growing community of inventors

Acton, MA, United States of America

Brian F Wibecan