Method and apparatus for quantitative diagnosis of performance p

Details Method and apparatus for quantitative diagnosis of performance p Method and apparatus for quantitative diagnosis of performance p

1997-10-29

1999-11-30

Beausoliel, Jr., Robert W.

Error detection/correction and fault detection/recovery

Data processing system error or fault handling

Reliability and availability

G06F 1100

Patent

active

059960906

ABSTRACT:
A method and apparatus are described for building diagnostic systems for performance problems in computer and communications systems. The diagnostic system outputs explanations that quantify contributions to performance problems, such as "90% of the increase in response time is due to increased LAN traffic." The preferred embodiment comprises: (1) a representation of the target system as a directed acyclic graph; (2) diagnostic techniques that compute numerical weights for arcs in the directed graph; and (3) a diagnosis engine that uses the directed graph and arc weights to output quantitative performance diagnoses. Nodes in the directed graph are measurement variables in the target system. Arcs in the graph indicate functional dependencies between measurement variables. Arc weights indicate the contribution of a child variable to performance problems manifested in the parent variable. The diagnosis engine searches the directed graph to find paths with the largest explanatory power, as computed from the arc weights.

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