# info command

## Syntax

    info args

-   args = one or more of the following keywords: *out*, *all*,
    *system*, *memory*, *communication*, *computes*, *dumps*, *fixes*,
    *groups*, *regions*, *variables*, *coeffs*, *styles*, *time*,
    *accelerator*, or *configuration*
-   *out* values = *screen*, *log*, *append* filename, *overwrite*
    filename
-   *styles* values = *all*, *angle*, *atom*, *bond*, *compute*,
    *command*, *dump*, *dihedral*, *fix*, *improper*, *integrate*,
    *kspace*, *minimize*, *pair*, *region*

## Examples

``` LAMMPS
info system
info groups computes variables
info all out log
info all out append info.txt
info styles all
info styles atom
```

## Description

Print out information about the current internal state of the running
LAMMPS process. This can be helpful when debugging or validating complex
input scripts. Several output categories are available and one or more
output category may be requested.

The *out* flag controls where the output is sent. It can only be sent to
one target. By default this is the screen, if it is active. The *log*
argument selects the log file instead. With the *append* and *overwrite*
option, followed by a filename, the output is written to that file,
which is either appended to or overwritten, respectively.

The *all* flag activates printing all categories listed below.

The *configuration* category prints some information about the LAMMPS
version as well as architecture and OS it is run on.

The *memory* category prints some information about the current memory
allocation of MPI rank 0 (this the amount of dynamically allocated
memory reported by LAMMPS classes). Where supported, also some OS
specific information about the size of the reserved memory pool size
(this is where malloc() and the new operator request memory from) and
the maximum resident set size is reported (this is the maximum amount of
physical memory occupied so far).

The *system* category prints a general system overview listing. This
includes the unit style, atom style, number of atoms, bonds, angles,
dihedrals, and impropers and the number of the respective types, box
dimensions and properties, force computing styles and more.

The *communication* category prints a variety of information about
communication and parallelization: the MPI library version level, the
number of MPI ranks and OpenMP threads, the communication style and
layout, the processor grid dimensions, ghost atom communication mode,
cutoff, and related settings.

The *computes* category prints a list of all currently defined computes,
their IDs and styles and groups they operate on.

The *dumps* category prints a list of all currently active dumps, their
IDs, styles, filenames, groups, and dump frequencies.

The *fixes* category prints a list of all currently defined fixes, their
IDs and styles and groups they operate on.

The *groups* category prints a list of all currently defined groups.

The *regions* category prints a list of all currently defined regions,
their IDs and styles and whether \"inside\" or \"outside\" atoms are
selected.

The *variables* category prints a list of all currently defined
variables, their names, styles, definition and last computed value, if
available.

The *coeffs* category prints a list for each defined force style (pair,
bond, angle, dihedral, improper) indicating which of the corresponding
coefficients have been set. This can be very helpful to debug error
messages like \"All pair coeffs are not set\".

The *accelerator* category prints out information about compile time
settings of included accelerator support for the GPU, KOKKOS, INTEL, and
OPENMP packages.

The *styles* category prints the list of styles available in the current
LAMMPS binary. It supports one of the following options to control which
category of styles is printed out:

-   all
-   angle
-   atom
-   bond
-   compute
-   command
-   dump
-   dihedral
-   fix
-   improper
-   integrate
-   kspace
-   minimize
-   pair
-   region

The *time* category prints the accumulated CPU and wall time for the
process that writes output (usually MPI rank 0).

## Restrictions

> none

## Related commands

[print](print)

## Default

The *out* option has the default *screen*.

The *styles* option has the default *all*.