| [9] | 1 | .TH TOP 1
|
|---|
| 2 | .SH NAME
|
|---|
| 3 | top \- show processes sorted by CPU usage
|
|---|
| 4 | .SH SYNOPSIS
|
|---|
| 5 | .B top
|
|---|
| 6 | .SH DESCRIPTION
|
|---|
| 7 | Top displays a list of all running processes, once every update interval
|
|---|
| 8 | (currently 5 seconds). It is sorted by the CPU usage of the processes in
|
|---|
| 9 | the last interval. The first display is the CPU usage of processes since
|
|---|
| 10 | the boot time.
|
|---|
| 11 |
|
|---|
| 12 | At the top of the screen, top shows the current system load averages in
|
|---|
| 13 | the last 1-minute, 5-minute and 15-minute intervals. Then, over the
|
|---|
| 14 | last top interval it displays: the number of alive, active, and sleeping
|
|---|
| 15 | processes; memory free; and CPU usage. CPU usage is split into
|
|---|
| 16 | user, kernel, system and idle time. Kernel time is time spent by kernel tasks,
|
|---|
| 17 | that is tasks that run in kernel mode in kernel address space. System
|
|---|
| 18 | time are system user processes, such as drivers and servers. User
|
|---|
| 19 | time is all other CPU time.
|
|---|
| 20 |
|
|---|
| 21 | Then it displays all the alive processes sorted by CPU usage in the last
|
|---|
| 22 | interval, with a number of fields for every process. Currently the
|
|---|
| 23 | following fields are displayed:
|
|---|
| 24 | .PP
|
|---|
| 25 | PID
|
|---|
| 26 | The process id of the process. Some processes (so-called kernel
|
|---|
| 27 | tasks) don't have a real process id, as they are not processes
|
|---|
| 28 | that are managed by the process manager, and aren't visible to
|
|---|
| 29 | other user processes by pid. They are shown by having their process
|
|---|
| 30 | slot number in square brackets.
|
|---|
| 31 | USERNAME
|
|---|
| 32 | The username of the effective uid at which the process runs,
|
|---|
| 33 | or a number if the username could not be looked up.
|
|---|
| 34 | PRI
|
|---|
| 35 | The system scheduling priority the process is currently running as.
|
|---|
| 36 | A lower priority number gives a higher scheduling priority. The
|
|---|
| 37 | lowest is 0. The scale is internal to the kernel.
|
|---|
| 38 | NICE
|
|---|
| 39 | The base scheduling priority the process has been given at startup.
|
|---|
| 40 | 0 is normal for a regular user process; the range is -20 to 20
|
|---|
| 41 | (PRIO_MIN and PRIO_MAX in <sys/resource.h>. Most system processes
|
|---|
| 42 | are given higher base priorities.
|
|---|
| 43 | SIZE
|
|---|
| 44 | Text + data size in kilobytes.
|
|---|
| 45 | STATE
|
|---|
| 46 | RUN if the process is runnable, empty if blocking.
|
|---|
| 47 | TIME
|
|---|
| 48 | Total number of CPU time spent in the process itself. So-called
|
|---|
| 49 | system time (CPU time spent on behalf of this process by another
|
|---|
| 50 | process, generally a system process) is not seen here.
|
|---|
| 51 | CPU
|
|---|
| 52 | Percentage of time that the process was running in the last interval.
|
|---|
| 53 | COMMAND
|
|---|
| 54 | Name of the command that belongs to this process.
|
|---|
| 55 |
|
|---|
| 56 | .SH "SEE ALSO"
|
|---|
| 57 | .BR ps (1)
|
|---|
| 58 | .SH BUGS
|
|---|
| 59 | This is a from-scratch reimplementation of top for MINIX 3.
|
|---|
| 60 | Many features (such as interactive commands) are not implemented.
|
|---|
| 61 | Sorting is only done by CPU usage currently. Displayed state is
|
|---|
| 62 | only RUN or empty.
|
|---|
| 63 | .SH AUTHOR
|
|---|
| 64 | Ben Gras (beng@few.vu.nl)
|
|---|
