Raytheon Company

Chad D McConnell

John R Wagner

Matthew A Taylor

A method for deterministic clock replay can include in response to executing a guest clock access instruction, estimating, using a virtual processor of a guest virtual machine, a value of a guest clock of the guest virtual machine based on (a) a current branch counter value that indicates a number of branch instructions executed since a first time and (b) an average time between execution of branch instructions, comparing the estimated value to an actual guest clock value of a guest clock of the guest virtual machine, and in response to determining the estimated value is less than the actual guest clock value by a threshold value, recording the number of branch instructions, the first time, and the average time between execution of branch instructions in a memory.

Estimation of guest clock value based on branch instruction count and average time between branch instructions for use in deterministic replay of execution

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Indialantic, FL, United States of America

Chad D McConnell