187 lines
6.0 KiB
Groff
187 lines
6.0 KiB
Groff
.\" Copyright (c) 1985, 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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.\" 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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.\" @(#)getrusage.2 8.1 (Berkeley) 6/4/93
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.\" $FreeBSD$
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.\"
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.Dd May 1, 2010
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.Dt GETRUSAGE 2
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.Os
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.Sh NAME
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.Nm getrusage
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.Nd get information about resource utilization
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In sys/types.h
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.In sys/time.h
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.In sys/resource.h
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.Fd "#define RUSAGE_SELF 0"
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.Fd "#define RUSAGE_CHILDREN -1"
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.Fd "#define RUSAGE_THREAD 1"
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.Ft int
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.Fn getrusage "int who" "struct rusage *rusage"
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.Sh DESCRIPTION
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The
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.Fn getrusage
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system call
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returns information describing the resources utilized by the current
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thread, the current process, or all its terminated child processes.
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The
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.Fa who
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argument is either
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.Dv RUSAGE_THREAD ,
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.Dv RUSAGE_SELF ,
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or
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.Dv RUSAGE_CHILDREN .
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The buffer to which
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.Fa rusage
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points will be filled in with
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the following structure:
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.Bd -literal
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struct rusage {
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struct timeval ru_utime; /* user time used */
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struct timeval ru_stime; /* system time used */
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long ru_maxrss; /* max resident set size */
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long ru_ixrss; /* integral shared text memory size */
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long ru_idrss; /* integral unshared data size */
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long ru_isrss; /* integral unshared stack size */
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long ru_minflt; /* page reclaims */
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long ru_majflt; /* page faults */
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long ru_nswap; /* swaps */
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long ru_inblock; /* block input operations */
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long ru_oublock; /* block output operations */
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long ru_msgsnd; /* messages sent */
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long ru_msgrcv; /* messages received */
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long ru_nsignals; /* signals received */
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long ru_nvcsw; /* voluntary context switches */
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long ru_nivcsw; /* involuntary context switches */
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};
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.Ed
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.Pp
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The fields are interpreted as follows:
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.Bl -tag -width ru_minfltaa
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.It Fa ru_utime
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the total amount of time spent executing in user mode.
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.It Fa ru_stime
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the total amount of time spent in the system executing on behalf
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of the process(es).
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.It Fa ru_maxrss
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the maximum resident set size utilized (in kilobytes).
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.It Fa ru_ixrss
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an
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.Dq integral
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value indicating the amount of memory used
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by the text segment
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that was also shared among other processes.
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This value is expressed
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in units of kilobytes * ticks-of-execution.
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Ticks are statistics clock ticks.
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The statistics clock has a frequency of
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.Fn sysconf _SC_CLK_TCK
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ticks per second.
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.It Fa ru_idrss
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an integral value of the amount of unshared memory residing in the
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data segment of a process (expressed in units of
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kilobytes * ticks-of-execution).
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.It Fa ru_isrss
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an integral value of the amount of unshared memory residing in the
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stack segment of a process (expressed in units of
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kilobytes * ticks-of-execution).
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.It Fa ru_minflt
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the number of page faults serviced without any I/O activity; here
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I/O activity is avoided by
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.Dq reclaiming
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a page frame from
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the list of pages awaiting reallocation.
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.It Fa ru_majflt
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the number of page faults serviced that required I/O activity.
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.It Fa ru_nswap
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the number of times a process was
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.Dq swapped
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out of main
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memory.
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.It Fa ru_inblock
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the number of times the file system had to perform input.
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.It Fa ru_oublock
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the number of times the file system had to perform output.
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.It Fa ru_msgsnd
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the number of IPC messages sent.
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.It Fa ru_msgrcv
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the number of IPC messages received.
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.It Fa ru_nsignals
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the number of signals delivered.
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.It Fa ru_nvcsw
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the number of times a context switch resulted due to a process
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voluntarily giving up the processor before its time slice was
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completed (usually to await availability of a resource).
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.It Fa ru_nivcsw
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the number of times a context switch resulted due to a higher
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priority process becoming runnable or because the current process
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exceeded its time slice.
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.El
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.Sh NOTES
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The numbers
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.Fa ru_inblock
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and
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.Fa ru_oublock
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account only for real
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I/O; 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 RETURN VALUES
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.Rv -std getrusage
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.Sh ERRORS
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The
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.Fn getrusage
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system call will fail if:
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.Bl -tag -width Er
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.It Bq Er EINVAL
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The
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.Fa who
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argument is not a valid value.
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.It Bq Er EFAULT
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The address specified by the
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.Fa rusage
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argument is not in a valid part of the process address space.
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.El
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.Sh SEE ALSO
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.Xr gettimeofday 2 ,
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.Xr wait 2 ,
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.Xr clocks 7
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.Sh HISTORY
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The
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.Fn getrusage
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system call appeared in
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.Bx 4.2 .
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The
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.Dv RUSAGE_THREAD
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facility first appeared in
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.Fx 8.1 .
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.Sh BUGS
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There is no way to obtain information about a child process
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that has not yet terminated.
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