расширенный мониторинг системы и процессов (Advanced System and Process Monitor)
Описание (Description)
The program pcp-atop is an interactive monitor to view various
aspects of load on a system. It shows the occupation of the most
critical hardware resources (from a performance point of view) on
system level, i.e. cpu, memory, disk and network.
It also shows which processes are responsible for the indicated
load with respect to cpu and memory load on process level. Disk
load is shown per process if "storage accounting" is active in
the kernel.
Every interval (default: 10 seconds) information is shown about
the resource occupation on system level (cpu, memory, disks and
network layers), followed by a list of processes which have been
active during the last interval (note that all processes that
were unchanged during the last interval are not shown, unless the
key 'a' has been pressed or unless sorting on memory occupation
is done). If the list of active processes does not entirely fit
on the screen, only the top of the list is shown (sorted in order
of activity).
The intervals are repeated till the number of samples (specified
as command argument) is reached, or till the key 'q' is pressed
in interactive mode.
When invoked via the pcp(1) command, the PCPIntro(1) options
-A/--align, -a/--archive, -h/--host, -O/--origin, -S/--start,
-s/--samples, -T/--finish, -t/--interval, -v/--version,
-z/--hostzone and -z/--timezone become indirectly available.
Additionally, the --hotproc option can be used to request the
per-process PCP metrics be used instead of the default proc
metrics from pmdaproc(1).
When pcp-atop is started, it checks whether the standard output
channel is connected to a screen, or to a file/pipe. In the
first case it produces screen control codes (via the ncurses
library) and behaves interactively; in the second case it
produces flat ASCII-output.
In interactive mode, the output of pcp-atop scales dynamically to
the current dimensions of the screen/window.
If the window is resized horizontally, columns will be added or
removed automatically. For this purpose, every column has a
particular weight. The columns with the highest weights that fit
within the current width will be shown.
If the window is resized vertically, lines of the process/thread
list will be added or removed automatically.
Furthermore in interactive mode the output of pcp-atop can be
controlled by pressing particular keys. However it is also
possible to specify such key as flag on the command line. In
that case pcp-atop switches to the indicated mode on beforehand;
this mode can be modified again interactively. Specifying such
key as flag is especially useful when running pcp-atop with
output to a pipe or file (non-interactively). These flags are
the same as the keys that can be pressed in interactive mode (see
section INTERACTIVE COMMANDS).
Additional flags are available to support storage of pcp-atop
data in PCP archive format (see section PCP DATA STORAGE).
