# Command: testsuite::test_iaf_ring

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Name:

    testsuite::test_iaf_ring - sli script for test of iaf_neuron spike interaction
      across multiple machines.

Synopsis:

    nest_indirect test_iaf_ring  --> success

Description:

      test_iaf_ring checks if spikes can travel along a chain of neurons
      and whether the result is independent of the number of machines
      involved in the computation.

      The unittest function distributed_assert_or_die can only handle the
      output of a single machine. Therefore the script collects the spikes
      of all neurons using a parrot neuron. The script does not check the
      id of the sender, only the spike timing. A more strict test could be
      carried out with a unittest function which merges the output of all
      machines.

      The correct sequence of spikes including their ids is documented at
      the end of this file. Note that due to the use of an intermediate
      parrot neuron the reported spike times have an offset of 1ms (10
      steps) with respect to the documented values. The offset corresponds
      to the default delay of 1ms.

Author:

    Joche Martin Eppler, Markus Diesmann, Marc-Oliver Gewaltig

FirstVersion:

    January 2006

SeeAlso:

- testsuite::test_iaf_i0
- testsuite::test_getrng_neuron

Source:

    /opt/conda/conda-bld/nest_1512421404550/work/nest-2.12.0/testsuite/mpitests/test_iaf_ring.sli

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