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Measuring Periodic Task Scheduling

By Cort Dougan, February 01, 2004

High-performance real-time applications absolutely demand predictable response times. Cort presents a C program that measures periodic task-scheduling jitter in Linux.
February 04:

Figure 2: Output under RTCore.

$ rtcore &
[1] 15692
$ ./jitter.rtl
CPU0: 44.3 us CPU1: 34.6 us CPU2: 47.3 us CPU3: 42.6 us
CPU0: 44.3 us CPU1: 34.6 us CPU2: 47.3 us CPU3: 42.8 us
CPU0: 44.3 us CPU1: 34.6 us CPU2: 47.3 us CPU3: 44.4 us
CPU0: 45.6 us CPU1: 34.6 us CPU2: 47.3 us CPU3: 44.4 us
CPU0: 45.6 us CPU1: 34.9 us CPU2: 47.3 us CPU3: 44.4 us
CPU0: 45.6 us CPU1: 34.9 us CPU2: 47.3 us CPU3: 47.3 us
CPU0: 45.6 us CPU1: 46.0 us CPU2: 47.3 us CPU3: 47.3 us



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