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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 1: Output under stock Linux.

$ /bin/nice -n -20 jitter
CPU0: 29794.0 us CPU1: 29543.0 us CPU2: 29503.0 us CPU3: 30001.0 us
CPU0: 29794.0 us CPU1: 29872.0 us CPU2: 29503.0 us CPU3: 30001.0 us
CPU0: 35657.0 us CPU1: 29872.0 us CPU2: 29503.0 us CPU3: 30001.0 us
CPU0: 35657.0 us CPU1: 35575.0 us CPU2: 35287.0 us CPU3: 35012.0 us
CPU0: 35657.0 us CPU1: 35575.0 us CPU2: 35287.0 us CPU3: 35012.0 us
CPU0: 35657.0 us CPU1: 35575.0 us CPU2: 35287.0 us CPU3: 35012.0 us
CPU0: 803538.0 us CPU1: 803232.0 us CPU2: 862970.0 us CPU3: 802759.0 us
CPU0: 803538.0 us CPU1: 803232.0 us CPU2: 862970.0 us CPU3: 802759.0 us
CPU0: 803538.0 us CPU1: 803232.0 us CPU2: 862970.0 us CPU3: 802759.0 us
CPU0: 803538.0 us CPU1: 803232.0 us CPU2: 862970.0 us CPU3: 802759.0 us
CPU0: 803538.0 us CPU1: 803232.0 us CPU2: 862970.0 us CPU3: 802759.0 us
CPU0: 803538.0 us CPU1: 803232.0 us CPU2: 862970.0 us CPU3: 802759.0 us
CPU0: 803538.0 us CPU1: 803232.0 us CPU2: 862970.0 us CPU3: 802759.0 us
CPU0: 803538.0 us CPU1: 803232.0 us CPU2: 862970.0 us CPU3: 802759.0 us



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