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latency

Langue: en

Version: 2008-04-19 (debian - 07/07/09)

Section: 1 (Commandes utilisateur)

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>.
Mais il faut dire un truc de bien pour la technique quand même : c'est
une bonne façon de faire tenir tranquille le cerveau rationnel, ça
l'occupe. Et pendant ce temps là il emmerde moins l'autre hémisphère,
qui peut travailler tranquille.
-+- Noëlle, sur fr.rec.photo -+-