latency - Online in the Cloud

PROGRAM:

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

-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

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