<span class="n">make</span> <span class="n">g</span><span class="o">++</span> <span class="c1"># build LAMMPS for your platform</span>
</pre></div>
</div>
<p>Second, use a restart filename which contains ”.mpiio”. Note that it
does not have to end in ”.mpiio”, just contain those characters.
Unlike MPI-IO dump files, a particular restart file must be both
written and read using MPI-IO.</p>
<p>Restart files are written on timesteps that are a multiple of N but
not on the first timestep of a run or minimization. You can use the
<a class="reference internal" href="write_restart.html"><span class="doc">write_restart</span></a> command to write a restart file
before a run begins. A restart file is not written on the last
timestep of a run unless it is a multiple of N. A restart file is
written on the last timestep of a minimization if N > 0 and the
minimization converges.</p>
<p>Instead of a numeric value, N can be specifed as an <a class="reference internal" href="variable.html"><span class="doc">equal-style variable</span></a>, which should be specified as v_name, where
name is the variable name. In this case, the variable is evaluated at
the beginning of a run to determine the next timestep at which a
restart file will be written out. On that timestep, the variable will
be evaluated again to determine the next timestep, etc. Thus the
variable should return timestep values. See the stagger() and
logfreq() and stride() math functions for <a class="reference internal" href="variable.html"><span class="doc">equal-style variables</span></a>, as examples of useful functions to use in
this context. Other similar math functions could easily be added as
options for <a class="reference internal" href="variable.html"><span class="doc">equal-style variables</span></a>.</p>
<p>For example, the following commands will write restart files
every step from 1100 to 1200, and could be useful for debugging
a simulation where something goes wrong at step 1163:</p>
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