ps: Process table
In ps: List, Query, Manipulate System Processes

ps	R Documentation

Process table

Data frame with the currently running processes.

ps(user = NULL, after = NULL, columns = NULL)

`user`	Username, to filter the results to matching processes.
`after`	Start time (`POSIXt`), to filter the results to processes that started after this.
`columns`	Columns to include in the result. If `NULL` (the default), then a default set of columns are returned, see below. The columns are shown in the same order they are specified in `columns`, but each column is included at most once. Use `"*"` to include all possible columns, and prefix a column name with `-` to remove it.

Columns shown by default, if columns is not given or NULL:

pid: Process ID.
ppid: Process ID of parent process.
name: Process name.
username: Name of the user (real uid on POSIX).
status: I.e. running, sleeping, etc.
user: User CPU time.
system: System CPU time.
rss: Resident set size, the amount of memory the process currently uses. Does not include memory that is swapped out. It does include shared libraries.
vms: Virtual memory size. All memory the process has access to.
created: Time stamp when the process was created.
ps_handle: ps_handle objects, in a list column.

Additional columns that can be requested via columns:

cmdline: Command line, in a single string, from ps_cmdline().
vcmdline: Like cmdline, but each command line argument in a separate string.
cwd: Current working directory, from ps_cwd().
exe: Path of the executable of the process, from ps_exe().
num_fds: Number of open file descriptors, from ps_num_fds().
num_threads: Number of threads, from ps_num_threads().
cpu_children_user: See ps_cpu_times().
cpu_children_system: See ps_cpu_times().
terminal: Terminal device, from ps_terminal().
uid_real: Real user id, from ps_uids().
uid_effective: Effective user id, from ps_uids().
uid_saved: Saved user id, from ps_uids().
gid_real: Real group id, from ps_gids().
gid_effective: Effective group id, from ps_gids().
gid_saved: Saved group id, from ps_gids().
mem_shared: See ps_memory_info().
mem_text: See ps_memory_info().
mem_data: See ps_memory_info().
mem_lib: See ps_memory_info().
mem_dirty: See ps_memory_info().
mem_pfaults: See ps_memory_info().
mem_pageins: See ps_memory_info().
mem_maxrss: See ps_memory_full_info().
mem_uss: See ps_memory_full_info().
mem_pss: See ps_memory_full_info().
mem_swap: See ps_memory_full_info().