htop


SYNOPSIS
       htop [-dChusv]

DESCRIPTION
       Htop is a free (GPL) ncurses-based process viewer for Linux.

       It  is similar to top, but allows you to scroll vertically and horizon-
       tally, so you can see all the processes running on  the  system,  along
       with their full command lines.

       Tasks  related  to  processes  (killing,  renicing) can be done without
       entering their PIDs.

COMMAND-LINE OPTIONS
       Mandatory arguments to long options are madatory for short options too.

       -d --delay=DELAY
              Delay between updates, in tenths of seconds

       -C --no-color --no-colour
              Start htop in monochrome mode

       -h --help
              Display a help message and exit

       -u --user=USERNAME
              Show only the processes of a given user

       -s --sort-key COLUMN
              Sort by this column (use --sort-key help for a column list)

       -v --version
              Output version information and exit

INTERACTIVE COMMANDS
       The following commands are supported while in htop:

       Arrows, PgUP, PgDn, Home, End
            Scroll the process list.

       Space
            Tag or untag a process. Commands that can operate on multiple pro-
            cesses,  like "kill", will then apply over the list of tagged pro-
            cesses, instead of the currently highlighted one.

       U    Untag all processes (remove all tags added with the Space key).

       s    Trace process system calls: if strace(1)  is  installed,  pressing
            this  key  will  attach it to the currently selected process, pre-
            senting a live update of system calls issued by the process.

       l    Display open files for a process: if lsof(1) is installed,  press-
            ing  this  key will display the list of file descriptors opened by
            choose among color schemes, and  select  which  columns  are  dis-
            played, in which order.

       F3, /
            Incrementally  search  the command lines of all the displayed pro-
            cesses. The currently selected (highlighted) command  will  update
            as  you type. While in search mode, pressing F3 will cycle through
            matching occurrences.

       F4, \
            Incremental process filtering: type in part of a  process  command
            line and only processes whose names match will be shown. To cancel
            filtering, enter the Filter option again and press Esc.

       F5, t
            Tree view: organize processes by parenthood, and layout the  rela-
            tions between them as a tree. Toggling the key will switch between
            tree and your previously selected sort view. Selecting a sort view
            will exit tree view.

       F6, <, >
            Select a field for sorting. The current sort field is indicated by
            a highlight in the header.

       F7, ]
            Increase the selected process's  priority  (subtract  from  'nice'
            value).  This can only be done by the superuser.

       F8, [
            Decrease the selected process's priority (add to 'nice' value)

       F9, k
            "Kill" process: sends a signal which is selected in a menu, to one
            or a group of processes. If processes were tagged, sends the  sig-
            nal to all tagged processes.  If none is tagged, sends to the cur-
            rently selected process.

       F10, q
            Quit

       I    Invert the sort order: if sort  order  is  increasing,  switch  to
            decreasing, and vice-versa.

       +, - When in tree view mode, expand or collapse subtree. When a subtree
            is collapsed a "+" sign shows to the left of the process name.

       a (on multiprocessor machines)
            Set CPU affinity: mark which CPUs a process is allowed to use.

       u    Show only processes owned by a specified user.

       M    Sort by memory usage (top compatibility key).

       P    Sort by processor usage (top compatibility key).
       H    Hide user threads: on systems that represent them differently than
            ordinary processes (such as recent NPTL-based systems),  this  can
            hide  threads  from userspace processes in the process list. (This
            is a toggle key.)

       Ctrl-L
            Refresh: redraw screen and recalculate values.

       Numbers
            PID search: type in process ID and the selection highlight will be
            moved to it.


COLUMNS
       The  following  columns can display data about each process. A value of
       '-' in all the rows indicates that a column is unsupported on your sys-
       tem,  or  currently unimplemented in htop. The names below are the ones
       used in the "Available Columns" section of the setup screen. If a  dif-
       ferent name is shown in htop's main screen, it is shown below in paren-
       thesis.

       Command
            The full command line of the process (i.e program name  and  argu-
            ments).

       PID  The process ID.

       PPID The parent process ID.

       PGRP The process's group ID.

       SESSION (SESN)
            The process's session ID.

       TTY_NR (TTY)
            The controlling terminal of the process.

       TPGID
            The  process ID of the foreground process group of the controlling
            terminal.

       STATE (S)
            The state of the process:
               S for sleeping (idle)
               R for running
               D for disk sleep (uninterruptible)
               Z for zombie (waiting for parent to read it's exit status)
               T for traced or suspended (e.g by SIGTSTP)
               W for paging

       PROCESSOR (CPU)
            The ID of the CPU the process last executed on.

       NLWP The number of threads in the process.
            The user CPU time, which is the amount of  time  the  process  has
            spent executing on the CPU in user mode (i.e everything but system
            calls), measured in clock ticks.

       STIME (STIME+)
            The system CPU time, which is the amount of time  the  kernel  has
            spent executing system calls on behalf of the process, measured in
            clock ticks.

       TIME (TIME+)
            The time, measured in clock ticks that the process  has  spent  in
            user and system time (see UTIME, STIME above).

       CUTIME
            The  children's  user  CPU  time,  which is the amount of time the
            process's waited-for children have spent executing  in  user  mode
            (see UTIME above).

       CSTIME
            The  children's  system  CPU time, which is the amount of time the
            kernel has spent executing system  calls  on  behalf  of  all  the
            process's waited-for children (see STIME above).

       PRIORITY (PRI)
            The  kernels  internal priority for the process, usually just it's
            nice value plus twenty. Different for real-time processes.

       PERCENT_MEM
            The percentage of memory the process is currently using (based  on
            the process's resident memory size, see M_RESIDENT below).

       M_SIZE (VIRT)
            Size in memory of the total program size.

       M_RESIDENT (RES)
            The resident set size, i.e the size of the text and data sections,
            plus stack usage.

       M_SHARE (SHR)
            The size of the process's shared pages

       M_TRS (CODE)
            The size of the text segment of the process (i.e the size  of  the
            processes executable instructions).

       M_LRS (LIB)
            The library size of the process.

       M_DRS (DATA)
            The size of the data segment plus stack usage of the process.

       M_DT (DIRTY)
            The size of the dirty pages of the process.

       WCHAR (WR_CHAR)
            The number of bytes the process has written.

       SYSCR (RD_SYSC)
            The number of read(2) syscalls for the process.

       SYSCW (WR_SYSC)
            The number of write(2) syscalls for the process.

       RBYTES (IO_RBYTES)
            Bytes of read(2) I/O for the process.

       WBYTES (IO_WBYTES)
            Bytes of write(2) I/O for the process.

       IO_READ_RATE (IORR)
            The I/O rate of read(2) in bytes per second, for the process.

       IO_WRITE_RATE (IOWR)
            The I/O rate of write(2) in bytes per second, for the process.

       IO_RATE (IO)
            The I/O rate, IO_READ_RATE + IO_WRITE_RATE (see above).

       CNCLWB (IO_CANCEL)
            Bytes of cancelled write(2) I/O.

       CGROUP
            Which cgroup the process is in.

       CTID OpenVZ container ID, a.k.a virtual environment ID.

       VPID OpenVZ process ID.

       VXID VServer process ID.

       All other flags
            Currently unsupported (always displays '-').


SEE ALSO
       proc(5), top(1), free(1), ps(1), uptime(1)


AUTHORS
       htop  is  developed  by   Hisham   Muhammad   <loderunner@users.source-
       forge.net>.

       This  man  page  was  written  by  Bartosz Fenski <fenio@o2.pl> for the
       Debian GNU/Linux distribution (but it may be used by  others).  It  was
       updated  by Hisham Muhammad, and later by Vincent Launchbury, who wrote
       the 'Columns' section.
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