forked from lijiext/lammps
64 lines
2.1 KiB
Plaintext
64 lines
2.1 KiB
Plaintext
"LAMMPS WWW Site"_lws - "LAMMPS Documentation"_ld - "LAMMPS Commands"_lc :c
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:link(lws,http://lammps.sandia.gov)
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:link(ld,Manual.html)
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:link(lc,Section_commands.html#comm)
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:line
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comm_style command :h3
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[Syntax:]
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comm_style style :pre
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style = {brick} or {tiled} :ul
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[Examples:]
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comm_style brick
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comm_style tiled :pre
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[Description:]
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This command sets the style of inter-processor communication of atom
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information that occurs each timestep as coordinates and other
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properties are exchanged between neighboring processors and stored as
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properties of ghost atoms.
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For the default {brick} style, the domain decomposition used by LAMMPS
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to partition the simulation box must be a regular 3d grid of bricks,
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one per processor. Each processor communicates with its 6 Cartesian
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neighbors in the grid to acquire information for nearby atoms.
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For the {tiled} style, a more general domain decomposition can be
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used, as triggered by the "balance"_balance.html or "fix
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balance"_fix_balance.html commands. The simulation box can be
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partitioned into non-overlapping rectangular-shaped "tiles" or varying
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sizes and shapes. Again there is one tile per processor. To acquire
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information for nearby atoms, communication must now be done with a
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more complex pattern of neighboring processors.
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Note that this command does not actually define a partitoining of the
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simulation box (a domain decomposition), rather it determines what
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kinds of decompositions are allowed and the pattern of communication
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used to enable the decomposition. A decomposition is created when the
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simulation box is first created, via the "create_box"_create_box.html
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or "read_data"_read_data.html or "read_restart"_read_restart.html
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commands. For both the {brick} and {tiled} styles, the initial
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decomposition will be the same, as described by
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"create_box"_create_box.html and "processors"_processors.html
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commands. The decomposition can be changed via the
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"balance"_balance.html or "fix balance"_fix_balance.html commands.
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[Restrictions:] none
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[Related commands:]
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"comm_modify"_comm_modify.html, "processors"_processors.html,
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"balance"_balance.html, "fix balance"_fix_balance.html
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[Default:]
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The default style is brick.
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