Accession Number : ADA327988

Title :   Measurement-Based Dependability Evaluation of Multiprocessor Systems.

Descriptive Note : Final rept.,

Corporate Author : ILLINOIS UNIV AT URBANA

Personal Author(s) : Iyer, R. I.

PDF Url : ADA327988

Report Date : 1996

Pagination or Media Count : 4

Abstract : In the previous reporting period, we showed that, when many users run the same software, such as an operating system, the majority of field software failures are rediscoveries of known problems. This clearly shows that the number of faults identified in a software system is not the only important factor; rediscoveries can seriously degrade software dependability. The effects of rediscoveries are: (1) more failures than the number of faults, (2) wasted service resources due to repeated data collection and diagnosis of the same problem, and (3) being unable to provide service to users until diagnosis is complete even if a solution already exists. To address the second and third effects, we developed symptom-based diagnosis of rediscovered software failures and showed that the majority of rediscoveries can be automatically diagnosed based on symptoms, such as procedure call trace and problem detection location.

Descriptors :   *SOFTWARE ENGINEERING, *COMPUTER PROGRAM RELIABILITY, OPERATING SYSTEMS(COMPUTERS), MULTIPROCESSORS, ONLINE SYSTEMS, COMPUTER PROGRAM VERIFICATION, COMPUTER AIDED DIAGNOSIS.

Subject Categories : Computer Programming and Software

Distribution Statement : APPROVED FOR PUBLIC RELEASE