NAME¶
latency - Xenomai timer latency benchmark
SYNOPSIS¶
latency [
options]
DESCRIPTION¶
latency is part of the Xenomai test suite. It is a timer latency
benchmark program. The system must run a suitable Xenomai enabled kernel with
the respective module (xeno_timerbench).
OPTIONS¶
latency accepts the following options:
- -h
- print histograms of min, avg, max latencies
- -s
- print statistics of min, avg, max latencies
- -H <histogram-size>
- default = 200, increase if your last bucket is full
- -B <bucket-size>
- default = 1000ns, decrease for more resolution
- -p <period_us>
- sampling period
- -l <data-lines per header>
- default=21, 0 to supress headers
- -T <test_duration_seconds>
- default=0, so ^C to end
- -q
- supresses RTD, RTH lines if -T is used
- -D <testing_device_no>
- number of testing device, default=0
- -t <test_mode>
- 0=user task (default), 1=kernel task, 2=timer IRQ
- -f
- freeze trace for each new max latency
- -c <cpu>
- pin measuring task down to given CPU
- -P <priority>
- task priority (test mode 0 and 1 only)
AUTHOR¶
latency was written by Philippe Gerum <rpm@xenomai.org>. This man
page was written by Roland Stigge <stigge@antcom.de>.