Electrical computers and digital processing systems: virtual mac – Task management or control – Process scheduling
Reexamination Certificate
2006-01-24
2006-01-24
Courtenay, III, St. John (Department: 2194)
Electrical computers and digital processing systems: virtual mac
Task management or control
Process scheduling
C709S224000, C719S313000
Reexamination Certificate
active
06990668
ABSTRACT:
An apparatus and method passively determine when a job in a clustered computing environment is dead. Each node in the cluster has a cluster engine for communicating between each job on the node and jobs on other nodes. A protocol is defined that includes one or more acknowledge (ACK) rounds, and that only performs local processing between ACK rounds. The protocol is executed by jobs that are members of a defined group. Each job in the group has one or more work threads that execute the protocol. In addition, each job has a main thread that communicates between the job and jobs on other nodes (through the cluster engine), routes appropriate messages from the cluster engine to a work thread, and signals to the cluster engine when a fault occurs when the work thread executes the protocol. By assuring that a dead job is reported to other members of the group, liveness information for group members can be monitored without the overhead associated with active liveness checking.
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Miller Robert
Morey Vicki Lynn
Thayib Kiswanto
Williams Laurie Ann
Courtenay III St. John
Martin Derek P.
Martin & Associates LLC
Opie George Lawrence
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