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
98 lines
2.9 KiB
Groff
98 lines
2.9 KiB
Groff
.SH "SUNOS 5 NOTES"
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CPU percentage is calculated as a fraction of total available computing
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resources. Hence on a multiprocessor machine a single threaded process
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can never consume cpu time in excess of 1 divided by the number of processors.
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For example, on a 4 processor machine, a single threaded process will
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never show a cpu percentage higher than 25%. The CPU percentage column
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will always total approximately 100, regardless of the number of processors.
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The kernel summary line shows the following information, all displayed
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as a per-second rate:
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.TP 9
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.B ctxsw
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Context switches.
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.TP 9
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.B trap
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Number of traps.
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.TP 9
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.B intr
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Number of interrupts.
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.TP 9
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.B syscall
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Number of system calls.
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.TP 9
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.B fork
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Number of forks and vforks.
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.TP 9
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.B flt
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Number of page faults.
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.TP 9
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.B pgin
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Number of kilobytes paged in to physical memory.
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.TP 9
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.B pgout
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Number of kilobytes paged out from physical memory.
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.PP
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The memory summary line displays the following:
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.TP 14
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.B "phys mem"
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Total amount of physical memory that can be allocated for use by processes
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(it does not include memory reserved for the kernel's use).
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.TP 14
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.B "free mem"
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The amount of unallocated physical memory.
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.TP 14
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.B "total swap"
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The total amount of swap area allocated on disk.
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.TP 14
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.B "free swap"
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The amount of swap area on disk that is still available.
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.PP
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Unlike previous versions of
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.IR top ,
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the swap figures will differ from the summary output of
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.IR swap (1M)
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since the latter includes physical memory as well.
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.PP
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The column
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.B NLWP
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indicates the number of lightweight processes in a process.
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This usually corresponds to the number of threads in that process.
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.PP
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The display of individual threads can be toggled with the
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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, priority, CPU time and percent CPU are
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shown for each individual thread. Other information is identical
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for all threads in the same process. In this display the column
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.B LWP
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replaces
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.B NLWP
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and shows the lightweight process id. The
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column names
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.B LWP
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and
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.B NLWP
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are consistent with
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.IR ps (1).
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.PP
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In BSD Unix, process priority was represented internally as a signed
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offset from a zero value with an unsigned value. The "zero" value
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was usually something like 20, allowing for a range of priorities
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from -20 to 20. As implemented on SunOS 5, older versions of top
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continued to interpret process priority in this manner, even though
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it was no longer correct. Starting with top version 3.5, this was
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changed to agree with the rest of the system.
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.PP
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Long options are not currently available in Solaris.
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.PP
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The SunOS 5 (Solaris 2) port was originally written by Torsten Kasch,
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<torsten@techfak.uni-bielefeld.de>. Many contributions have been
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provided by Casper Dik <Casper.Dik@sun.com>.
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Support for multi-cpu, calculation of CPU% and memory stats provided by
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Robert Boucher <boucher@sofkin.ca>, Marc Cohen <marc@aai.com>,
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Charles Hedrick <hedrick@geneva.rutgers.edu>, and
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William L. Jones <jones@chpc>.
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