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====== RT-Tests ======

rt-tests is a [[realtime:documentation:howto:tools:start|test suite]], that contains programs to test various real time Linux features. It is maintained by Clark Williams and John Kacur.
For communication, the [[realtime:communication:mailinglists|rt-users mailing list]] is used.


===== Programs =====

The following programs are part of the rt-tests:

  * [[realtime:documentation:howto:tools:cyclictest:start|cyclictest]] – [[https://man7.org/linux/man-pages/man2/clock_nanosleep.2.html|clock_nanosleep]] latency detection
  * [[https://man.archlinux.org/man/cyclicdeadline.8.en|cyclicdeadline]] – test the deadline scheduler (SCHED_DEADLINE) using a cyclictest style program
  * [[https://man.archlinux.org/man/deadline_test.8.en|deadline_test]] – test the deadline scheduler
  * [[realtime:documentation:howto:tools:hackbench|hackbench]] – scheduler benchmark/stress test
  * [[https://man.archlinux.org/man/hwlatdetect.8.en|hwlatdetect]] – CLI for [[https://docs.kernel.org/trace/hwlat_detector.html|/sys/kernel/tracing/hwlat_detector]]
  * [[https://man.archlinux.org/man/oslat.8.en|oslat]] – measures delay with [[https://en.wikipedia.org/wiki/Time_Stamp_Counter|RDTSC]]
  * [[https://man.archlinux.org/man/pip_stress.8.en|pip_stress]] – priority Inheritance with processes
  * [[https://man.archlinux.org/man/pi_stress.8.en|pi_stress]] – a stress test for POSIX Priority Inheritance mutexes
  * [[https://man.archlinux.org/man/pmqtest.8.en|pmqtest]] – start pairs of threads and measure the latency of interprocess communication with POSIX messages queues
  * [[https://man.archlinux.org/man/ptsematest.8.en|ptsematest]] – start two threads and measure the latency of interprocess communication with POSIX mutex.
  * [[https://man.archlinux.org/man/determine_maximum_mpps.8.en|determine_maximum_mpps]] – determine the maximum mpps the machine can handle
  * [[https://man.archlinux.org/man/queuelat.8.en|queuelat]] – queue latency test program
  * [[https://man.archlinux.org/man/rt-migrate-test.8.en|rt-migrate-test]] – real-time task migration program
  * [[https://man.archlinux.org/man/signaltest.8.en|signaltest]] – signal roundtrip test software
  * [[https://man.archlinux.org/man/sigwaittest.8.en|sigwaittest]] – start two threads or fork two processes and measure the latency between sending and receiving a signal
  * [[https://man.archlinux.org/man/ssdd.8.en|ssdd]] – have a tracer do a bunch of PTRACE_SINGLESTEPs
  * [[https://man.archlinux.org/man/svsematest.8.en|svsematest]] – start two threads or fork two processes and measure the latency of SYSV semaphores


===== Compile and install =====

rt-tests suite can be installed from source: [[https://git.kernel.org/pub/scm/utils/rt-tests/rt-tests.git/tree/src|rt-tests/src]],
the releases are available [[https://www.kernel.org/pub/linux/utils/rt-tests|here]].
The [[https://man7.org/linux/man-pages/man3/numa.3.html|libnuma]] and build-essentials are required. The given example is for a Debian based system:

<code bash>
sudo apt-get install build-essential libnuma-dev
</code>

libnuma-dev is required for build. Usually, it's safe to have libnuma-dev installed also in non-NUMA systems, but if you don't want to install the NUMA libs (e.g. in embedded environment) then compile with make NUMA=0.


Clone source code (check out the latest stable branch, because the master branch is not used for stable release any more), compile it and install it to the local filesystem

<code bash>
git clone git://git.kernel.org/pub/scm/utils/rt-tests/rt-tests.git
cd rt-tests
git checkout stable/v1.0
make all
make install
</code>

The last step is optional. All compiled programs can be executed
from the build directory directly. If only a single program should
be compiled only the single make target for the specific program 
could be executed (example for cyclictest):

<code bash>
make cyclictest
</code>
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