International Business Machines Corporation

Amy Xin Chen

Chulho Kim

Robert Sidney Blackmore

Rajeev Sivaram

Scott D Epter

Rama Krishna Govindaraju

Hanhong Xue

Epoch numbers are maintained in a pair wise fashion at a plurality of communication endpoints to provide communication consistency and recovery from a range of failure conditions including total or partial node failure and subsequent recovery. Once an epoch state inconsistency is recognized, negotiation procedures provide an effective mechanism to reestablish valid communication links without the need to employ global variables which inherently possess greater transmission and overhead requirements needed to maintain communications. Renegotiation of recognizably valid epoch numbers occurs on a pair wise basis.

System and program product to recover from node failure/recovery incidents in distributed systems in which notification does not occur

Method to recover from node failure/recovery incidents in distributed systems in which notification does not occur

A method is provided for sharing and/or transporting data within a single node of a multi-node data processing. The method avoids the necessity of making more than one copy of the data to be shared or transported. The method is tunable based on the size of the data segment involved. A shared memory area between tasks running in different address spaces on the node is used to coordinate the process and for task to task communication. The increase in efficiency provided by the intranodal process described herein also provides advantages to the internodal communication process since more CPU cycles are available for that aspect of system operation.

Memory sharing in a distributed data processing system using modified address space to create extended address space for copying data

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Poughkeepsie, NY, United States of America

Amy Xin Chen