Page Menu
Home
c4science
Search
Configure Global Search
Log In
Files
F94967613
processors.html
No One
Temporary
Actions
Download File
Edit File
Delete File
View Transforms
Subscribe
Mute Notifications
Award Token
Subscribers
None
File Metadata
Details
File Info
Storage
Attached
Created
Wed, Dec 11, 19:13
Size
1 KB
Mime Type
text/html
Expires
Fri, Dec 13, 19:13 (2 d)
Engine
blob
Format
Raw Data
Handle
22907315
Attached To
rLAMMPS lammps
processors.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>
processors command
</H3>
<P><B>
Syntax:
</B>
</P>
<PRE>
processors Px Py Pz
</PRE>
<UL><LI>
Px,Py,Pz = # of processors in each dimension of a 3d grid
</UL>
<P><B>
Examples:
</B>
</P>
<PRE>
processors 2 4 4
</PRE>
<P><B>
Description:
</B>
</P>
<P>
Specify how processors are mapped as a 3d logical grid to the global
simulation box.
</P>
<P>
When this command has not been specified, LAMMPS will choose Px, Py,
Pz based on the dimensions of the global simulation box so as to
minimize the surface/volume ratio of each processor's sub-domain.
</P>
<P>
Since LAMMPS does not load-balance by changing the grid of 3d
processors on-the-fly, this command should be used to override the
LAMMPS default if it is known to be sub-optimal for a particular
problem. For example, a problem where the atom's extent will change
dramatically over the course of the simulation.
</P>
<P>
The product of Px, Py, Pz must equal P, the total # of processors
LAMMPS is running on. If multiple partitions are being used then P is
the number of processors in this partition; see
<A
HREF =
"Section_start.html#2_6"
>
this
section
</A>
for an explanation of the -partition
command-line switch.
</P>
<P>
If P is large and prime, a grid such as 1 x P x 1 will be required,
which may incur extra communication costs.
</P>
<P><B>
Restrictions:
</B>
</P>
<P>
This command cannot be used after the simulation box is defined by a
<A
HREF =
"read_data.html"
>
read_data
</A>
or
<A
HREF =
"create_box.html"
>
create_box
</A>
command.
It can be used before a restart file is read to change the 3d
processor grid from what is specified in the restart file.
</P>
<P><B>
Related commands:
</B>
none
</P>
<P><B>
Default:
</B>
</P>
<P>
LAMMPS chooses Px, Py, Pz
</P>
</HTML>
Event Timeline
Log In to Comment