Using highly skewed clocks for application based tracing and...

Details Using highly skewed clocks for application based tracing and... Using highly skewed clocks for application based tracing and...

2006-12-11

2009-12-01

Le, John H (Department: 2863)

Data processing: measuring, calibrating, or testing

Measurement system

History logging or time stamping

C370S449000, C370S516000, C702S089000, C714S700000

Reexamination Certificate

active

07627457

ABSTRACT:
A computer-implemented method, for application based tracing and for normalization of processor clocks in a symmetric multiprocessor environment. By deliberately establishing a large skew among processor clocks, it is possible to perform application based tracing by directly using the processors. In addition, the identity, time stamp, and drift information of each processor may be used to create a time library. The time library is used to adjust a measured time to execute a program or software routine. The adjusted time is a normalized time that is statistically more accurate than the measured time alone. The adjusted time is then reported as the time to execute the program or software routine.

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