64 lines
2.6 KiB
Groff
64 lines
2.6 KiB
Groff
.TH TOP 1
|
|
.SH NAME
|
|
top \- show processes sorted by CPU usage
|
|
.SH SYNOPSIS
|
|
.B top
|
|
.SH DESCRIPTION
|
|
Top displays a list of all running processes, once every update interval
|
|
(currently 5 seconds). It is sorted by the CPU usage of the processes in
|
|
the last interval. The first display is the CPU usage of processes since
|
|
the boot time.
|
|
|
|
At the top of the screen, top shows the current system load averages in
|
|
the last 1-minute, 5-minute and 15-minute intervals. Then, over the
|
|
last top interval it displays: the number of alive, active, and sleeping
|
|
processes; memory free; and CPU usage. CPU usage is split into
|
|
user, kernel, system and idle time. Kernel time is time spent by kernel tasks,
|
|
that is tasks that run in kernel mode in kernel address space. System
|
|
time are system user processes, such as drivers and servers. User
|
|
time is all other CPU time.
|
|
|
|
Then it displays all the alive processes sorted by CPU usage in the last
|
|
interval, with a number of fields for every process. Currently the
|
|
following fields are displayed:
|
|
.PP
|
|
PID
|
|
The process id of the process. Some processes (so-called kernel
|
|
tasks) don't have a real process id, as they are not processes
|
|
that are managed by the process manager, and aren't visible to
|
|
other user processes by pid. They are shown by having their process
|
|
slot number in square brackets.
|
|
USERNAME
|
|
The username of the effective uid at which the process runs,
|
|
or a number if the username could not be looked up.
|
|
PRI
|
|
The system scheduling priority the process is currently running as.
|
|
A lower priority number gives a higher scheduling priority. The
|
|
lowest is 0. The scale is internal to the kernel.
|
|
NICE
|
|
The base scheduling priority the process has been given at startup.
|
|
0 is normal for a regular user process; the range is -20 to 20
|
|
(PRIO_MIN and PRIO_MAX in <sys/resource.h>. Most system processes
|
|
are given higher base priorities.
|
|
SIZE
|
|
Text + data size in kilobytes.
|
|
STATE
|
|
RUN if the process is runnable, empty if blocking.
|
|
TIME
|
|
Total number of CPU time spent in the process itself. So-called
|
|
system time (CPU time spent on behalf of this process by another
|
|
process, generally a system process) is not seen here.
|
|
CPU
|
|
Percentage of time that the process was running in the last interval.
|
|
COMMAND
|
|
Name of the command that belongs to this process.
|
|
|
|
.SH "SEE ALSO"
|
|
.BR ps (1)
|
|
.SH BUGS
|
|
This is a from-scratch reimplementation of top for MINIX 3.
|
|
Many features (such as interactive commands) are not implemented.
|
|
Sorting is only done by CPU usage currently. Displayed state is
|
|
only RUN or empty.
|
|
.SH AUTHOR
|
|
Ben Gras (beng@few.vu.nl)
|