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