b89261ba01
Due to differences in (mainly) measuring and accumulating CPU times, the two top programs end up serving different purposes: the NetBSD top is a system administration tool, while the MINIX3 top (now mtop) is a performance debugging tool. Therefore, we keep both. The newly imported BSD top has a few MINIX3-specific changes. CPU statistics separate system time from kernel time, rather than kernel time from time spent on handling interrupts. Memory statistics show numbers that are currently relevant for MINIX3. Swap statistics are disabled entirely. All of these changes effectively bring it closer to how mtop already worked as well. Change-Id: I9611917cb03e164ddf012c5def6da0e7fede826d
135 lines
2.7 KiB
Groff
135 lines
2.7 KiB
Groff
.SH "FreeBSD NOTES"
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Priorities are shown the same as they exist in process data structures,
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ranging from 0 to 255. Note that this is not the same as the ps(1)
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\*(lqpri\*(rq column, which subtracts 84 from each number before displaying
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it. Priority numbers fall in to priority classes as follows:
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.TP 15
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0 \- 63
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Interrupt threads
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.TP 15
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64 \- 127
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Top half kernel threads
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.TP 15
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128 \- 159
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Realtime user threads
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.TP 15
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160 \- 223
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Time sharing user threads
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.TP 15
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224 \- 255
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Idle user threads
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.SH "FreeBSD THREADS"
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Starting with FreeBSD 8.0 the display of individual threads can be
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toggled with the synonymous commands
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.B t
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and
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.BR H.
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Information about state, flags, CPU time and percent cpu are shown
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for each individual thread. Other information is identical for all
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threads in the same process.
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.SH "FreeBSD ALTERNATE DISPLAY"
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FreeBSD supports an alternate process display which shows i/o
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information. Since this information is tracked per process and not
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per thread, the per-thread display is not supported in this mode.
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All fields calculate the number of operations observed since the
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last update and are displayed as a per-second rate.
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The fields in this display are as follows:
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.TP
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.B VCSW
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Voluntary context switches
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.TP
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.B IVCSW
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Involuntary context switches
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.TP
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.B READ
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Number of blocks read
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.TP
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.B WRITE
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Number of blocks written
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.TP
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.B FAULT
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Number of page faults
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.TP
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.B TOTAL
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Total number of i/o operations
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.TP
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.B PERCENT
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Percentage of total i/o attributed to this process. If no i/o occured
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then this field is 0 for all processes.
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.SH "FreeBSD KERNEL SUMMARY"
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All rates are shown per-second.
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.TP
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.B Ctx
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Number of context switches.
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.TP
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.B Trap
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Number of kernel traps.
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.TP
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.B Intr
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Number of device interrupts.
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.TP
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.B Soft
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Number of software interrupts.
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.TP
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.B Fork
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Number of forks, vforks, and rforks.
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.TP
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.B Flt
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Total number of page faults.
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.TP
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.B Pgin
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Number of pages paged or swapped in to physical memory.
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.TP
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.B Pgout
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Number of pages paged or swapped out from physical memory.
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.TP
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.B Fr
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Total number of pages freed.
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.SH "FreeBSD MEMORY SUMMARY"
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Memory: 10M Act 1208K Inact 3220K Wired 132K Free 25% Swap, 2924Kin 2604Kout
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.TP
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.B K:
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Kilobyte
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.TP
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.B M:
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Megabyte
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.TP
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.B G:
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Gigabyte
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.TP
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.B %:
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1/100
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.TP
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.B Act:
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number of pages active
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.TP
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.B Inact:
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number of pages inactive
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.TP
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.B Wired:
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number of pages wired down
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.TP
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.B Free:
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number of pages free
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.TP
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.B Swap:
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swap usage
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.TP
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.B Kin:
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kilobytes swap pager pages paged in (last interval)
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.TP
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.B Kout:
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kilobytes swap pager pages paged out (last interval)
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.PP
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See /usr/include/sys/vmmeter.h and /sys/vm/vm_meter.c.
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.PP
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Contributors: Christos Zoulas, Steven Wallace, Wolfram Schneider,
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Monte Mitzelfelt.
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.PP
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This module was retrofitted from FreeBSD 4.6.2 sources.
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