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This example tests the scheduling accuracy. The relevant
files are rt_process.c and monitor.c. Run make test to try it out.
min: is the minimum rt_task latency (how much time a task ran late)
in nanoseconds during a measurement cycle.
max: is the maximum. The jitter is max-min.
You can change use several module parameters in rt_process.c.
For example, try
insmod rt_process.o advance=25000
Parameters:
period: period in nanoseconds; default = 1000000
advance: if non-zero, schedule interrupts to occur this many nanoseconds early
to reduce jitter; default = 0
ntests: number of tests in the measurement cycle; default = 500
mode: 1 - periodic mode, 0 - oneshot; default=0
Example to use histplot
./monitor > m.out&
./histplot m.out m.res
This will show you the histogram of the jitter.
( PSW )
(C) 1999 Michael Barabanov 1997-1999
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