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partition.txt
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.. index:: partition
partition command
=================
Syntax
""""""
.. parsed-literal::
partition style N command ...
* style = *yes* or *no*
* N = partition number (see asterisk form below)
* command = any LAMMPS command
Examples
""""""""
.. parsed-literal::
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
Description
"""""""""""
This command invokes the specified command on a subset of the
partitions of processors you have defined via the -partition
command-line switch. See :ref:`Section_start 6 <start_7>`
for an explanation of the switch.
Normally, every input script command in your script is invoked by
every partition. This behavior can be modified by defining world- or
universe-style :doc:`variables <variable>` 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 :doc:`jump <jump>` command.
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 *style* and *N* arguments.
If the *style* is *yes*, the command will be invoked on any partition
which matches the *N* argument. If the *style* is *no* the command
will be invoked on all the partitions which do not match the Np
argument.
Partitions are numbered from 1 to Np, where Np is the number of
partitions specified by the :ref:`-partition command-line switch <start_7>`.
*N* 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 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).
This command can be useful for the "run_style verlet/split" command
which imposed requirements on how the :doc:`processors <processors>`
command lays out a 3d grid of processors in each of 2 partitions.
Restrictions
""""""""""""
none
Related commands
""""""""""""""""
:doc:`run_style verlet/split <run_style>`
**Default:** none
.. _lws: http://lammps.sandia.gov
.. _ld: Manual.html
.. _lc: Section_commands.html#comm
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