<p>This command allows you to use variants of various styles if they
exist. In that respect it operates the same as the <aclass="reference internal"href="Section_start.html#start-7"><spanclass="std std-ref">-suffix command-line switch</span></a>. It also has options
to turn off or back on any suffix setting made via the command line.</p>
<p>The specified style can be <em>gpu</em>, <em>intel</em>, <em>kk</em>, <em>omp</em>, <em>opt</em> or
<em>hybrid</em>. These refer to optional packages that LAMMPS can be built
with, as described in <aclass="reference internal"href="Section_start.html#start-3"><spanclass="std std-ref">this section of the manual</span></a>. The “gpu” style corresponds to
the GPU package, the “intel” style to the USER-INTEL package, the “kk”
style to the KOKKOS package, the “omp” style to the USER-OMP package,
and the “opt” style to the OPT package.</p>
<p>These are the variants these packages provide:</p>
<ulclass="simple">
<li>GPU = a handful of pair styles and the PPPM kspace_style, optimized to
run on one or more GPUs or multicore CPU/GPU nodes</li>
<li>USER-INTEL = a collection of pair styles and neighbor routines
optimized to run in single, mixed, or double precision on CPUs and
Intel(R) Xeon Phi(TM) coprocessors.</li>
<li>KOKKOS = a collection of atom, pair, and fix styles optimized to run
using the Kokkos library on various kinds of hardware, including GPUs
via Cuda and many-core chips via OpenMP or threading.</li>
<li>USER-OMP = a collection of pair, bond, angle, dihedral, improper,
kspace, compute, and fix styles with support for OpenMP
multi-threading</li>
<li>OPT = a handful of pair styles, cache-optimized for faster CPU
performance</li>
<li>HYBRID = a combination of two packages can be specified (see below)</li>
</ul>
<p>As an example, all of the packages provide a <aclass="reference internal"href="pair_lj.html"><spanclass="doc">pair_style lj/cut</span></a> variant, with style names lj/cut/opt, lj/cut/omp,
lj/cut/gpu, lj/cut/intel, or lj/cut/kk. A variant styles
can be specified explicitly in your input script, e.g. pair_style
lj/cut/gpu. If the suffix command is used with the appropriate style,
you do not need to modify your input script. The specified suffix
(opt,omp,gpu,intel,kk) is automatically appended whenever your
input script command creates a new <aclass="reference internal"href="atom_style.html"><spanclass="doc">atom</span></a>,
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