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Process Viewer / System monitor

top Description
top (table of processes) is a task manager program found in many Unix-like operating systems. It produces an ordered list of running processes selected by user-specified criteria, and updates it periodically. Default ordering is by CPU usage, and only the top CPU consumers are shown. top 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.
There are several different versions of top. The traditional Unix version was written by William LeFebvre and originally copyrighted in 1984. It is hosted on SourceForge, and release 3.7 was announced in 2008.
The Linux top version is part of the procps-ng group of tools. It was originally written by Roger Binns but shortly thereafter it was taken over by others.
top is useful for system administrators, as it shows which users and processes are consuming the most system resources at any given time.
On Solaris, the roughly equivalent program is prstat. MS-DOS has tasklist and graphical Microsoft operating systems have the Windows Task Manager. IBM AIX has an updating running processes list as part of the topas and topas_nmon commands.
The load average numbers in Linux refers to the sum of the number of processes waiting in the run-queue plus the number currently executing. The number is absolute, not relative. And thus it can be unbounded; unlike utilization. The instant variations of the number of processes are damped with an exponential decay formula which is calculated using fixed point math.
The ps program is similar to top, but instead produces a snapshot of processes taken at the time of invocation.
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