2011-05-21 07:21:12 +08:00
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<CENTER><A HREF = "http://lammps.sandia.gov">LAMMPS WWW Site</A> - <A HREF = "Manual.html">LAMMPS Documentation</A> - <A HREF = "Section_commands.html#comm">LAMMPS Commands</A>
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<HR>
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<H3>suffix command
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</H3>
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<P><B>Syntax:</B>
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</P>
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<PRE>suffix style
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</PRE>
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<UL><LI>style = <I>off</I> or <I>on</I> or <I>opt</I> or <I>gpu</I> or <I>cuda</I>
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</UL>
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<P><B>Examples:</B>
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</P>
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<PRE>suffix off
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suffix on
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suffix gpu
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</PRE>
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<P><B>Description:</B>
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</P>
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<P>This command allows you to use variants of various styles if they
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exist. In that respect it operates the same as the <A HREF = "Section_start.html#start_6">-suffix
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command-line switch</A>. It also has options
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to turn off/on any suffix setting made via the command line.
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</P>
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<P>The specified style can be <I>opt</I> or <I>gpu</I> or <I>cuda</I>. These refer to
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optional packages that LAMMPS can be built with, as described in <A HREF = "Section_start.html#start_3">this
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section of the manual</A>. The "opt" style
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corrsponds to the OPT package, the "gpu" style to the GPU package, and
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the "cuda" style to the USER-CUDA package.
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</P>
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<P>These are the variants these packages provide:
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</P>
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<UL><LI>OPT = a handful of pair styles, cache-optimized for faster CPU performance
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<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
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<LI>USER-CUDA = a collection of atom, pair, fix, compute, and intergrate styles, optimized to run on one or more NVIDIA GPUs
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</UL>
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<P>As an example, all of the packages provide a <A HREF = "pair_lj.html">pair_style
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lj/cut</A> variant, with style names lj/cut/opt or
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lj/cut/gpu or lj/cut/cuda. A variant styles can be specified
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explicitly in your input script, e.g. pair_style lj/cut/gpu. If the
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suffix command is used with the appropriate style, you do not need to
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modify your input script. The specified suffix (opt,gpu,cuda) is
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automatically appended whenever your input script command creates a
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new <A HREF = "atom_style.html">atom</A>, <A HREF = "pair_style.html">pair</A>, <A HREF = "fix.html">fix</A>,
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<A HREF = "compute.html">compute</A>, or <A HREF = "run_style.html">run</A> style. If the variant
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version does not exist, the standard version is created.
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</P>
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<P>If the specified style is <I>off</I>, then any previously specified suffix
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is temporarily disabled, whether it was specified by a command-line
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switch or a previous suffix command. If the specified style is <I>on</I>,
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a disabled suffix is turned back on. The use of these 2 commands lets
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your input script use a standard LAMMPS style (i.e. a non-accelerated
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variant), which can be useful for testing or benchmarking purposes.
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Of course this is also possible by not using any suffix commands, and
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explictly appending or not appending the suffix to the relevant
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commands in your input script.
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</P>
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<P><B>Restrictions:</B> none
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</P>
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<P><B>Related commands:</B>
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</P>
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<P><A HREF = "Section_start.html#start_6">Command-line switch -suffix</A>
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</P>
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<P><B>Default:</B> none
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</P>
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</HTML>
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