NAME

       switchtest - Xenomai context switch test

SYNOPSIS

       switchtest [options] threadspec threadspec...

DESCRIPTION

       switchtest is part of Xenomai. It can be used to test thread context switches. switchtest
       creates threads of various types and attempts to switch context between these threads,
       printing the count of context switches every second. A suitable Xenomai enabled kernel
       with the respective module (xeno_posix) must be installed.

OPTIONS

       Each threadspec specifies the characteristics of a thread to be created:

       threadspec = (rtk|rtup|rtus|rtuo)(_fp|_ufpp|_ufps)*[0-9]*

       rtk
           for a kernel-space real-time thread

       rtup
           for a user-space real-time thread running in primary mode

       rtus
           for a user-space real-time thread running in secondary mode

       rtuo
           for a user-space real-time thread oscillating between primary and secondary mode

       _fp
           means that the created thread will have the XNFPU bit armed (only valid for rtk)

       _ufpp
           means that the created thread will use the FPU when in primary mode (invalid for rtus)

       _ufps
           means that the created thread will use the FPU when in secondary mode (invalid for rtk
           and rtup)

       [0-9]
           specifies the ID of the CPU where the created thread will run, 0 if unspecified

       Passing no threadspec is equivalent to running:

       switchtest rtkN rtkN rtk_fpN rtk_fpN rtk_fp_ufppN rtk_fp_ufppN rtupN rtupN rtup_ufppN
       rtup_ufppN rtusN rtusN rtus_ufpsN rtus_ufpsN rtuoN rtuoN rtuo_ufppN rtuo_ufppN rtuo_ufpsN
       rtuo_ufpsN rtuo_ufpp_ufpsN rtuo_ufpp_ufpsN

       with N=1,...,nr_cpus, i.e. occurrences of all the arguments for each CPU

       Passing only the --nofpu or -n argument is equivalent to running:

       switchtest rtkN rtkN rtupN rtupN rtusN rtusN rtuoN rtuoN

       similar to the above.

       switchtest accepts the following options:

       --help, -h
           print usage information and exit

       --lines <lines>, -l <lines>
           print headers every <lines> lines

       --quiet or -q
           prevent this program from printing every second the count of ncontext switches

       --timeout <duration>, -T <duration>
           limit the test duration to <duration> seconds

       --nofpu, -n
           disables any use of FPU instructions

AUTHOR

       switchtest was written by Philippe Gerum and Gilles Chanteperdrix. This man page was
       written by Roland Stigge.