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partition command
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LAMMPS 15 Dec 2015 documentation
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partition command
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<div
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<span
id=
"index-0"
></span><h1>
partition command
<a
class=
"headerlink"
href=
"#partition-command"
title=
"Permalink to this headline"
>
¶
</a></h1>
<div
class=
"section"
id=
"syntax"
>
<h2>
Syntax
<a
class=
"headerlink"
href=
"#syntax"
title=
"Permalink to this headline"
>
¶
</a></h2>
<div
class=
"highlight-python"
><div
class=
"highlight"
><pre>
partition style N command ...
</pre></div>
</div>
<ul
class=
"simple"
>
<li>
style =
<em>
yes
</em>
or
<em>
no
</em></li>
<li>
N = partition number (see asterisk form below)
</li>
<li>
command = any LAMMPS command
</li>
</ul>
</div>
<div
class=
"section"
id=
"examples"
>
<h2>
Examples
<a
class=
"headerlink"
href=
"#examples"
title=
"Permalink to this headline"
>
¶
</a></h2>
<pre
class=
"literal-block"
>
partition yes 1 processors 4 10 6
partition no 5 print
"
Active partition
"
partition yes
<em>
5 fix all nve
partition yes 6
</em>
fix all nvt temp 1.0 1.0 0.1
</pre>
</div>
<div
class=
"section"
id=
"description"
>
<h2>
Description
<a
class=
"headerlink"
href=
"#description"
title=
"Permalink to this headline"
>
¶
</a></h2>
<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
class=
"reference internal"
href=
"Section_start.html#start-7"
><span>
Section_start 6
</span></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
class=
"reference internal"
href=
"variable.html"
><em>
variables
</em></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
class=
"reference internal"
href=
"jump.html"
><em>
jump
</em></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
<em>
style
</em>
and
<em>
N
</em>
arguments.
</p>
<p>
If the
<em>
style
</em>
is
<em>
yes
</em>
, the command will be invoked on any partition
which matches the
<em>
N
</em>
argument. If the
<em>
style
</em>
is
<em>
no
</em>
the command
will be invoked on all the partitions which do not match the Np
argument.
</p>
<p>
Partitions are numbered from 1 to Np, where Np is the number of
partitions specified by the
<a
class=
"reference internal"
href=
"Section_start.html#start-7"
><span>
-partition command-line switch
</span></a>
.
</p>
<p><em>
N
</em>
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
“
<em>
n
”
or
“
n
</em>
”
or
“
m*n
”
. An asterisk with no numeric values means
all partitions from 1 to Np. A leading asterisk means all partitions
from 1 to n (inclusive). A trailing asterisk means all partitions
from n to Np (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
class=
"reference internal"
href=
"processors.html"
><em>
processors
</em></a>
command lays out a 3d grid of processors in each of 2 partitions.
</p>
</div>
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"section"
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>
<h2>
Restrictions
<a
class=
"headerlink"
href=
"#restrictions"
title=
"Permalink to this headline"
>
¶
</a></h2>
<blockquote>
<div>
none
</div></blockquote>
</div>
<div
class=
"section"
id=
"related-commands"
>
<h2>
Related commands
<a
class=
"headerlink"
href=
"#related-commands"
title=
"Permalink to this headline"
>
¶
</a></h2>
<p><a
class=
"reference internal"
href=
"run_style.html"
><em>
run_style verlet/split
</em></a></p>
<p><strong>
Default:
</strong>
none
</p>
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