Homec4science
Diffusion lammps (master) Browse

lammps/doc/partition.html
7e6755866f77master

Last Change
Raw File

partition.html
View Options

<HTML>
<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>
</CENTER>
<HR>
<H3>partition command
</H3>
<P><B>Syntax:</B>
</P>
<PRE>partition style Np command ...
</PRE>
<UL><LI>style = <I>yes</I> or <I>no</I>
<LI>Np = partition number (see asterisk form below)
<LI>command = any LAMMPS command
</UL>
<P><B>Examples:</B>
</P>
<PRE>partition yes 1 processors 4 10 6
partition no 5 print "Active partition"
partition yes *5 fix all nve
partition yes 6* fix all nvt temp 1.0 1.0 0.1
</PRE>
<P><B>Description:</B>
</P>
<P>This command invokes the specified command on a subset of the
partitions of processors you have defined via the -partition
command-line switch. See <A HREF = "Section_start.html#start_6">Section_start 6</A>
for an explanation of the switch.
</P>
<P>Normally, every input script command in your script is invoked by
every partition. This behavior can be modified by defining world- or
universe-style <A HREF = "variable.html">variables</A> that have different values
for each partition. This mechanism can be used to cause your script
to jump to different input script files on different partitions, if
such a variable is used in a <A HREF = "jump.html">jump</A> command.
</P>
<P>The "partition" command is another mechanism for having as input
script operate differently on different partitions. It is basically a
prefix on any LAMMPS command. The commmand will only be invoked on
the partition(s) specified by the <I>style</I> and <I>Np</I> arguments.
</P>
<P>If the <I>style</I> is <I>yes</I>, the command will be invoked on any
partition which matches the Np argument. If the <I>style</I> is <I>no</I>
the command will be invoked on all the partitions which do not
match the Np argument.
</P>
<P>Partitions are numbered from 1 to N, where N is the number of
partitions specified by the <A HREF = "Section_start.html#start_6">-partition command-line
switch</A>.
</P>
<P>Np can be specified in one of two ways. An explicit numeric value can
be used, as in the 1st example above. Or a wild-card asterisk can be
used to span a range of partition numbers. This takes the form "*" or
"*n" or "n*" or "m*n". An asterisk with no numeric values means all
partitions from 1 to N. A leading asterisk means all partitions from
1 to n (inclusive). A trailing asterisk means all partitions from n
to N (inclusive). A middle asterisk means all partitions from m to n
(inclusive).
</P>
<P>This command can be useful for the "run_style verlet/split" command
which imposed requirements on how the <A HREF = "processors.html">processors</A>
command lays out a 3d grid of processors in each of 2 partitions.
</P>
<P><B>Restrictions:</B> none
</P>
<P><B>Related commands:</B> none
</P>
<P><A HREF = "run_style.html">run_style verlet/split</A>
</P>
<P><B>Default:</B> none
</P>
</HTML>
c4science · Help