2006-09-22 00:22:34 +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>restart command
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</H3>
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<P><B>Syntax:</B>
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</P>
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<PRE>restart 0
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restart N root
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restart N file1 file2
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</PRE>
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<UL><LI>N = write a restart file every this many timesteps
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<LI>root = filename to which timestep # is appended
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<LI>file1,file2 = two full filenames, toggle between them when writing file
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</UL>
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<P><B>Examples:</B>
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</P>
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<PRE>restart 0
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restart 1000 poly.restart
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restart 1000 restart.*.equil
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restart 10000 poly.%.1 poly.%.2
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</PRE>
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<P><B>Description:</B>
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</P>
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<P>Write out a binary restart file every so many timesteps as a run
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proceeds. A value of 0 means do not write out restart files. Using
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one filename as an argument will create a series of filenames which
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include the timestep in the filename. Using two filenames will
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produce only 2 restart files. LAMMPS will toggle between the 2 names
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as it writes successive restart files.
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</P>
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<P>Similar to <A HREF = "dump.html">dump</A> files, the restart filename(s) can contain
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two wild-card characters. If a "*" appears in the filename, it is
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replaced with the current timestep value. This is only recognized
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when a single filename is used (not when toggling back and forth).
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Thus, the 3rd example above creates restart files as follows:
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restart.1000.equil, restart.2000.equil, etc. If a single filename is
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used with no "*", then the timestep value is appended. E.g. the 2nd
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example above creates restart files as follows: poly.restart.1000,
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poly.restart.2000, etc.
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</P>
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<P>If a "%" character appears in the restart filename(s), then one file
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is written for each processor and the "%" character is replaced with
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the processor ID from 0 to P-1. An additional file with the "%"
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replaced by "base" is also written, which contains global information.
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For example, the files written on step 1000 for filename restart.%
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would be restart.base.1000, restart.0.1000, restart.1.1000, ...,
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restart.P-1.1000. This creates smaller files and can be a fast mode
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2010-09-11 07:00:40 +08:00
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of output and subsequent input on parallel machines that support
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parallel I/O.
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2006-09-22 00:22:34 +08:00
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</P>
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<P>Restart files are written on timesteps that are a multiple of N but
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not on the first timestep of a run or minimization. A restart file is
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not written on the last timestep of a run unless it is a multiple of
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N. A restart file is written on the last timestep of a minimization
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if N > 0 and the minimization converges.
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</P>
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<P>See the <A HREF = "read_restart.html">read_restart</A> command for information about
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what is stored in a restart file.
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</P>
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<P>Restart files can be read by a <A HREF = "read_restart.html">read_restart</A>
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command to restart a simulation from a particular state. Because the
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file is binary (to enable exact restarts), it may not be readable on
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another machine. In this case, the <A HREF = "Section_tools.html#restart">restart2data
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program</A> in the tools directory can be used
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to convert a restart file to an ASCII data file. Both the
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2008-03-01 09:13:20 +08:00
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read_restart command and restart2data tool can read in a restart file
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2006-09-22 00:22:34 +08:00
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that was written with the "%" character so that multiple files were
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created.
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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 = "write_restart.html">write_restart</A>, <A HREF = "read_restart.html">read_restart</A>
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</P>
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<P><B>Default:</B>
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</P>
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<PRE>restart 0
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</PRE>
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</HTML>
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