142 lines
4.5 KiB
Groff
142 lines
4.5 KiB
Groff
.\" Copyright (c) 1980, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)vtimes.3 8.1 (Berkeley) 6/4/93
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.\"
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.Dd June 4, 1993
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.Dt VTIMES 3
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.Os BSD 4
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.Sh NAME
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.Nm vtimes
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.Nd get information about resource utilization
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.Sh SYNOPSIS
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.Fd #include <sys/vtimes.h>
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.Fn vtimes "struct vtimes *par_vm" "struct vtimes *ch_vm"
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.Sh DESCRIPTION
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.Bf -symbolic
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This interface is obsoleted by getrusage(2).
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It is available from the compatibility library, libcompat.
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.Ef
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.Pp
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The
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.Fn vtimes
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function
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returns accounting information for the current process and for
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the terminated child processes of the current
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process. Either
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.Fa par_vm
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or
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.Fa ch_vm
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or both may be 0, in which case only the information for the pointers
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which are non-zero is returned.
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.Pp
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After the call, each buffer contains information as defined by the
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contents of the include file
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.Pa /usr/include/sys/vtimes.h :
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.Bd -literal -offset indent
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struct vtimes {
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int vm_utime; /* user time (*HZ) */
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int vm_stime; /* system time (*HZ) */
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/* divide next two by utime+stime to get averages */
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unsigned vm_idsrss; /* integral of d+s rss */
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unsigned vm_ixrss; /* integral of text rss */
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int vm_maxrss; /* maximum rss */
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int vm_majflt; /* major page faults */
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int vm_minflt; /* minor page faults */
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int vm_nswap; /* number of swaps */
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int vm_inblk; /* block reads */
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int vm_oublk; /* block writes */
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};
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.Ed
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.Pp
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The
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.Fa vm_utime
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and
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.Fa vm_stime
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fields give the user and system
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time respectively in 60ths of a second (or 50ths if that
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is the frequency of wall current in your locality.) The
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.Fa vm_idrss
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and
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.Fa vm_ixrss
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measure memory usage. They are computed by integrating the number of
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memory pages in use each
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over
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.Tn CPU
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time. They are reported as though computed
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discretely, adding the current memory usage (in 512 byte
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pages) each time the clock ticks. If a process used 5 core
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pages over 1 cpu-second for its data and stack, then
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.Fa vm_idsrss
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would have the value 5*60, where
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.Fa vm_utime+vm_stime
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would be the 60.
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The
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.Fa Vm_idsrss
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argument
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integrates data and stack segment
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usage, while
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.Fa vm_ixrss
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integrates text segment usage.
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The
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.Fa Vm_maxrss
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function
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reports the maximum instantaneous sum of the
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text+data+stack core-resident page count.
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.Pp
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The
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.Fa vm_majflt
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field gives the number of page faults which
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resulted in disk activity; the
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.Fa vm_minflt
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field gives the
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number of page faults incurred in simulation of reference
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bits;
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.Fa vm_nswap
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is the number of swaps which occurred. The
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number of file system input/output events are reported in
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.Fa vm_inblk
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and
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.Fa vm_oublk
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These numbers account only for real
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.Tn I/O ;
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data supplied by the caching mechanism is charged only
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to the first process to read or write the data.
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.Sh SEE ALSO
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.Xr time 2 ,
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.Xr wait3 2 ,
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.Xr getrusage 2
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.Sh HISTORY
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The
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.Fn vlimit
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function appeared in
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.Bx 4.2 .
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