Jõudluse jälgimine ja probleemilahendus käsurea utiliitide abil
Autor
Heiki Nooremäe
Sissejuhatus
In most Unix-like operating systems, the top command is a system monitor tool that produces a frequently-updated list of processes. By default, the processes are ordered by percentage of CPU usage, with only the "top" CPU consumers shown. The top command shows how much processing power and memory are being used, as well as other information about the running processes. Some versions of top allow extensive customization of the display, such as choice of columns or sorting method.
The top command is useful for system administrators, as it shows which users and processes are consuming the most system resources at any given time.
It is also possible to redirect the output of top to a text file.
Htop is an advanced, interactive system monitor process viewer written for Linux. It is designed to replace the Unix program top. It shows a frequently updated list of the processes running on a computer, normally ordered by the amount of CPU usage. Unlike 'top', Htop provides a full list of processes running, instead of the top resource consuming processes. Htop also uses color and gives visual information about processor, swap and memory status.
Htop is often used in cases where Unix top does not provide enough information about the systems processes, for example when trying to find minor memory leaks in applications. Compared to 'top', it provides a more convenient, cursor-controlled interface for killing processes.
Htop is written in the C programming language using the ncurses library.
Atop is an ASCII full-screen performance monitor that is capable of reporting the activity of all processes (even if processes have finished during the interval), daily logging of system and process activity for long-term analysis, highlighting overloaded system resources by using colors, etc. At regular intervals, it shows system-level activity related to the CPU, memory, swap, disks, and network layers, and for every active process it shows the CPU utilization, the memory growth, priority, username, state, and exit code.
Ajalugu
The top command was inspired by the monitor process/topcpu command found in the VMS operating system. William LeFebvre wrote the first implementation of top in April 1984 for BSD 4.1 while a graduate student at Rice University. It was released as an Open source project under the BSD license, which allowed it to be included in numerous proprietary BSD and UNIX operating systems.
The top command has been reimplemented several times for different operating systems and under different licenses. In AIX an advanced top version was introduced in AIX 4.3 in 1999 called topas.
The first top for Linux was written by Roger Binns; the most recent and common Linux version is a full-color windowed implementation by James C. Warner that ships with the procps package.
top Keep listing the currently running processes, sorted by cpu usage (top users first). In KDE, you can get GUI-based Ktop from "K"menu under "System"-"Task Manager" (or by executing "ktop" in an X-terminal).
Top käsud
Kasutamiseks kirjutada käsureale top [käsk] Some options to top are listed below.
-d: Delay time interval as: -d ss.tt (seconds. tenths)
Specifies the delay between screen updates
-u: Monitor by user as: -u somebody
Monitor only processes with an effective UID or user name matching
That given.
-c: RUSER -- Real User Name. The real user name of the task's owner.
-C: color
Turn off the use of color in the display.
-I: idle-procs
Do not display idle processes.
-S: system-procs
Show system processes in the display.
-T: tag-names
List all available color tags and the current set of tests used
for color highlighting, then exit.
-a: all
Show all processes for as long as possible.
-b: batch
Use "batch" mode. In this mode, all input from the terminal is
ignored.
-c: full-commands
Show the full command line for each process.
-i: interactive
Use "interactive" mode. In this mode, any input is immediately
read for processing.
-q: quick
Renice top to -20 so that it will run faster.
-t: threads
Show individual threads on separate lines.
-v: version
Write version number information to stderr then exit immedi-
ately.
-m mode: mode=mode
Start the display in an alternate mode.
-o field: sort-order=field
Sort the process display area on the specified field.
-s time: delay=time
Set the delay between screen updates to time seconds.
-U username: user=username
Show only those processes owned by username.
atop
Paigaldamine apt-get install atop
