1. SYNOPSIS
latency [ options ]
2. 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).
3. OPTIONS
latency accepts the following options:
- -h
-
print histograms of min, avg, max latencies
- -g <file>
-
dump histogram to <file> in a format easily readable with gnuplot. An example script for gnuplot may be found in scripts/histo.gp in Xenomai sources distribution
- -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 suppress headers
- -T <test_duration_seconds>
-
default=0, so ^C to end
- -q
-
suppresses 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)
- -b
-
break upon mode switch
4. AUTHOR
latency was written by Philippe Gerum. This man page was written by Roland Stigge.