.SH "SUNOS 5 NOTES"
CPU percentage is calculated as a fraction of total available computing
resources.  Hence on a multiprocessor machine a single threaded process 
can never consume cpu time in excess of 1 divided by the number of processors.
For example, on a 4 processor machine, a single threaded process will 
never show a cpu percentage higher than 25%.  The CPU percentage column
will always total approximately 100, regardless of the number of processors.

The kernel summary line shows the following information, all displayed
as a per-second rate:
.TP 9
.B ctxsw
Context switches.
.TP 9
.B trap
Number of traps.
.TP 9
.B intr
Number of interrupts.
.TP 9
.B syscall
Number of system calls.
.TP 9
.B fork
Number of forks and vforks.
.TP 9
.B flt
Number of page faults.
.TP 9
.B pgin
Number of kilobytes paged in to physical memory.
.TP 9
.B pgout
Number of kilobytes paged out from physical memory.
.PP
The memory summary line displays the following: 
.TP 14
.B "phys mem" 
Total amount of physical memory that can be allocated for use by processes
(it does not include memory reserved for the kernel's use).
.TP 14
.B "free mem"
The amount of unallocated physical memory.
.TP 14
.B "total swap"
The total amount of swap area allocated on disk.
.TP 14
.B "free swap" 
The amount of swap area on disk that is still available.
.PP
Unlike previous versions of
.IR top ,
the swap figures will differ from the summary output of
.IR swap (1M)
since the latter includes physical memory as well.
.PP
The column 
.B NLWP
indicates the number of lightweight processes in a process.
This usually corresponds to the number of threads in that process.
.PP
The display of individual threads can be toggled with the
synonymous commands
.B t
and
.BR H.
Information about state, priority, CPU time and percent CPU are
shown for each individual thread.  Other information is identical
for all threads in the same process.  In this display the column
.B LWP
replaces 
.B NLWP
and shows the lightweight process id.  The
column names 
.B LWP
and
.B NLWP
are consistent with
.IR ps (1).
.PP
In BSD Unix, process priority was represented internally as a signed
offset from a zero value with an unsigned value.  The "zero" value
was usually something like 20, allowing for a range of priorities
from -20 to 20.  As implemented on SunOS 5, older versions of top
continued to interpret process priority in this manner, even though
it was no longer correct.  Starting with top version 3.5, this was
changed to agree with the rest of the system.
.PP
Long options are not currently available in Solaris.
.PP
The SunOS 5 (Solaris 2) port was originally written by Torsten Kasch,
<torsten@techfak.uni-bielefeld.de>.  Many contributions have been
provided by Casper Dik <Casper.Dik@sun.com>.
Support for multi-cpu, calculation of CPU% and memory stats provided by
Robert Boucher <boucher@sofkin.ca>, Marc Cohen <marc@aai.com>, 
Charles Hedrick <hedrick@geneva.rutgers.edu>, and
William L. Jones <jones@chpc>.